Decomposition Reactor Research Articles

Efficient ammonia conversion in proton conducting fuel cells: Combined application of dendritic anodes and nanofiber catalysts

Ammonia, with its high hydrogen content, serves as an optimal carbon-free medium for indirect hydrogen storage, making it ideal for fuel cells. Nevertheless, the limited anodic catalytic activity of Proton-conducting solid oxide fuel cells (PCFCs) significantly hampers NH3 utilization efficiency and overall performance. This study introduces efficient nano-catalysts deposited onto dendritic anodic microchannels, leading to the formation of an in-situ ammonia decomposition reactor for internal ammonia gas conversion. Compared to conventional cells, this cell, equipped with a catalyst bed, shows a 25% increase in peak power density and a 20%–30% enhancement in NH3 utilization efficiency. Additionally, ammonia undergoes efficient decomposition on anodic metallic nickel, which prevents nickel nitridation and improves cell stability. The augmented stability of these cells is evidenced by their prolonged operational lifespan under constant current conditions, extending from 63 to 108 h, thus marking a substantial enhancement in the system's durability and reliability.

Modeling & experimental studies on enhancement of H2S conversion using catalytic membrane reactor for hydrogen production

Abstract Acidic gases such as H2S and CO2 are generated in the refineries during coal gasification. These pollutant gases need to be treated before releasing to the atmosphere. Conventionally, H2S gas is treated by Claus process in which H2S is converted to elemental S and H2O, in presence of O2 at ∼1,200 K. In the present energy scenarios, hydrogen has got importance as a source of clean fuel for industrial application. The H2S generated in the refineries can be a potential precursor of hydrogen. If this hydrogen can be obtained by thermal decomposition of H2S, that can increase the overall economic value of the H2S containing streams and the produced hydrogen can be used for hydrocracking and hydro-treating in refineries, as well as to synthesize value-added products for chemical industries. However, H2S thermal decomposition is an endothermic and equilibrium limited reaction (equilibrium conversion is only ∼15 % at 1,000 K), requiring a very high temperature (∼1,500 K) to achieve even a conversion of greater than 40 %. Packed Bed Catalytic Membrane Reactor (PBCMR) for thermal decomposition of H2S can be a potential technology augmentation and process intensification to increase this equilibrium conversion. In this work, modeling and experimental studies of H2S thermal decomposition using in-house designed & developed PBCMR have been carried out. The modeling studies were validated with experimental data. Clay-alumina ceramic tubular membrane (L: 250 mm; OD: 12 mm; thickness: 2 mm) was fabricated using extrusion process having an average membrane pore size of ∼1 μm and with a porosity of ∼20 %. Pt (2 %) coated alumina extrudes were used as catalyst to accelerate the reaction kinetics. Experimental studies showed that H2S to hydrogen conversion of ∼90 % is achieved using PBCMR at ∼1,523 K, compared to only ∼40 % conversion in a conventional packed bed tubular reactor (without membrane). Modelling studies were carried out to study the influence of operating parameters such as, reactor wall temperature, feed temperature, pressure and feed velocity. Studies showed that reactor wall temperature is having the most dominant effect on H2S conversion, which is confirmed by experimental findings. The studies offer useful insights into the application of PBCMR technology for management of waste gas stream containing H2S and recovery of hydrogen.

Coproduction of metal oxide and CO2 through decomposition of carbonate in a moving bed with a central gas-flow channel

During carbonate calcination process, the block ores are often directly heated by high-temperature flue gas, which inevitably dilutes the potentially high-concentration CO2 from carbonate decomposition. In this study, we well implemented the coproduction of lightly burned magnesia (LBM) and high-concentration CO2 through decomposition of small-size magnesite in a devised novel moving bed reactor. The reactor is installed with a central gas-flow channel as internals to convert the moving bed into a radially flowing reactor, making it can process small-size particles. Verification of this design was implemented in an electrically heated pilot-scale facility processing about 10 kg h−1 magnesite (0–6 mm), and gaseous product contains about 99% CO2. Systematic tests employing laboratory fixed bed reactors with and without internals further showed that the thickness of particle layer between the heating wall and the central internals substantially affects heat transfer from outside to the inside, thus influencing the decomposition. It is particularly for magnesite because the formed LBM is both heat-resistant and flame-retardant. Therefore, an updated reactor for small-size carbonates decomposition and coproduction of CO2 is proposed.

Ta–W metal alloy membrane reactor for HI decomposition in I–S thermochemical cycle for hydrogen production

HIx processing section of Iodine-Sulfur (IS) thermochemical cycle suffers from the drawbacks of highly corrosive environment and a low thermodynamic conversion of HI decomposition (∼22% at 450 °C). This study investigates, for the first time, the potential of tantalum-tungsten (Ta–W) metal alloy membrane reactor for the decomposition of HI. A thin film of Ta–W alloy was deposited on clay-alumina support by DC magnetron sputtering under optimized set of parameters. The corrosion resistance of the Ta–W membrane was evaluated through electrochemical corrosion studies and immersion coupon tests in azeotropic HI (57 wt % in water) environment. The results confirmed that Ta–W had a higher corrosion resistance than Ta. HI decomposition was carried out in Ta–W membrane reactor and suitable operating parameters were finalized. An enhanced conversion of ∼98% was obtained at 450 °C and 105 Pa, while no permeation of HI, water and iodine was observed across the membrane.

Deciphering the influence of support in the performance of NiFe2O4 catalyst for the production of hydrogen fuel and nanocarbon by methane decomposition

Wet chemical synthesis route was used to synthesis nickel ferrite (NiFe2O4) nanoparticle. Later on the synthesized NiFe2O4 were supported on the surface of three traditional supports such as Al2O3, MgO and TiO2 to get NiFe2O4/Al2O3, NiFe2O4/TiO2 and NiFe2O4/MgO catalysts. The activity profile of each catalyst was evaluated in a fixed-bed reactor for direct methane decomposition at 800 °C. For both fresh and spent catalysts, many characterization techniques have been employed mainly XRD, FESEM, HRTEM, Raman spectroscopy, TGA, and nitrogen adsorption-desorption isotherm. X-ray powder diffraction studies revealed that all synthesized catalysts have a cubic spinel crystal structure. The XRD confirm the presence of NiFe2O4 particles in the component of fresh NiFe2O4/MgO, NiFe2O4/TiO2 and NiFe2O4/Al2O3 catalysts. Temperature Program Reduction (TPR) unveiled the presence of Ni oxides and Fe oxides by displaying reduction peaks in their respective temperature regions. The N2 adsorption-desorption isotherms of the fresh all catalysts reveal that these catalysts have a mesoporous structure. Activity data concluded NiFe2O4/MgO to be the most active catalysts among the tested catalysts methane conversion magnitude of 41.13 % and H2 formation rate of 84.40 × 10−5 mol H2 g−1 min−1. On the other hand, the H2 formation rate drastically declined and very poor activity of both NiFe2O4/TiO2 and NiFe2O4/Al2O3 catalysts was observed in the current work. XRD patterns, FESEM images and TGA analysis of spent NiFe2O4/MgO catalyst shown the filamentous carbon formation which secondarily confirm its higher activity, while its absence in catalysts of NiFe2O4/TiO2 and NiFe2O4/Al2O3. TGA analysis of the carbon deposited on the NiFe2O4/MgO catalyst showed that the amount of carbon was approximately 64 wt%. It was suggested that the formation of nickel-iron carbide revealed by XRD studies of spent catalysts may be the factor related to their poor activity while discussing the structure-activity relationship. Likewise, the higher degree of dispersion related to NiFe2O4/MgO as displayed by XRD, FESEM and TPR investigations, played a vital role in accelerating the rate of hydrogen formation.

Development of an ammonia decomposition reactor, afterburner and post-decomposition reactor for 1 kW solid oxide fuel cells using ammonia

Solid oxide fuel cells can overcome the poor flammability of ammonia by directly converting the chemical energy of ammonia into electricity. However, thermal stress by internal decomposition, nitriding at the solid oxide fuel cells stack and nitrogen oxides emissions must be considered when using ammonia in solid oxide fuel cells. In this study, an ammonia fuel processor was developed for stable operation and low emissions of solid oxide fuel cells using ammonia. The ammonia fuel processor consisting of an ammonia decomposition reactor, an afterburner and a post-decomposition reactor was tested using simulated off-gases of solid oxide fuel cells using ammonia. The ammonia conversion of the decomposition reactor varied from 32 % to 84 % with off-gas temperatures from 360 °C to 670 °C. When ammonia conversion after the solid oxide fuel cell stack was 99.70 %, nitrogen oxides emissions of the afterburner was 1.05 g/kWh, which is higher than the regulatory limit of 0.26 g/kWh. High fuel utilization and excess air ratio made nitrogen oxides emission even worse. The regulatory limit was successfully satisfied by using the post-decomposition reactor even when ammonia conversion after the solid oxide fuel cell stack was 99.10 %. The developed ammonia fuel processor could supply fuel at the optimal hydrogen-to-ammonia ratio and prevent nitrogen oxides emissions in solid oxide fuel cells using ammonia.

Additive manufacturing of ceramic single and multi-material components–A groundbreaking innovation for space applications too?

The main advantages of ceramic materials are their excellent thermal, chemical, and mechanical properties. They also have a much lower density than metals, making them ideal for lightweight construction, which can also be interesting for space components. However, ceramics have not been widely used due to their low ductility and the challenges of mechanical processing using conventional methods like milling and turning. Additionally, integrating different functions into a single component has been limited.The introduction of additive manufacturing (AM) technologies has revolutionized this field. It is now possible to manufacture highly complex ceramic components with unprecedented functionality. By hybridizing different manufacturing technologies and materials, additional functions such as electrical contacts, sensors, and actuators can be directly integrated, leading to improved manufacturing costs and component properties.Three different demonstrator examples are presented in this paper to give a first impression of what will be possible in the field of space applications in the future. These examples are a ceramic igniter, a ceramic reactor for thermal decomposition of H2O2, and a ceramic aerospike engine.

Development of an induction heating reactor for rapid catalytic CF4 decomposition

A novel catalytic reactor configuration based on the induction heating technique is proposed for the decomposition of CF4. To demonstrate the feasibility of this concept, a commercial catalyst and induction heating module are employed. The experimental results demonstrated that the reactor provides a fast response time (approximately 3 min) in the decomposition of CF4 (roughly 100 ppm), without the requirement for insulation or preheating. In addition, introduction of the induction heating technique was found to allow precise temperature control. Furthermore, empirical guidelines for optimizing the catalyst bed are established in terms of two design factors, namely the length/diameter ratio (≥ 1.48) of the catalyst bed, and 1/3 of the blending of an additional inductive heating medium in the catalyst bed. The fast response time exhibited by this system is expected to permit connection of the reactor with electric power generated by renewable energy.

Conceptual design of a fixed bed N2O decomposition reactor with a heat pipe heat exchanger

Abstract This paper introduces a novel process for decomposing N2O through interstage cooling utilizing a heat pipe heat exchanger. The reactor design involves segmenting the fixed bed reactor into multiple layers and integrating heat pipe heat exchangers between these layers to efficiently dissipate the high heat generated by the upper fixed bed reactor. This innovative approach facilitates the direct decomposition of N2O feedgas with high concentrations, obviating the need for gas dilution. The study conducted in this paper employed Fluent and ASPEN PLUS to investigate N2O decomposition with interstage cooling using heat pipe heat exchangers, as well as decomposition after dilution. A comparison between the two methods was made based on catalyst dosage, temperature uniformity, and reactor energy consumption. The results demonstrate that the proposed method for N2O decomposition via interstage cooling with a heat pipe heat exchanger is a viable option, offering the desired temperature control and enhanced efficiency. Furthermore, this reactor design effectively reduces both catalyst usage and energy consumption, providing substantial advantages over traditional approaches.

Optimal configurations of ammonia decomposition reactor with minimum power consumption and minimum heat transfer rate

Ammonia decomposition reactor is an important component in process of ammonia hydrogen energy conversion technology where ammonia is the storage and transportation medium for hydrogen. In this research, a tubular ammonia decomposition reactor is modeled according to finite-time thermodynamics. With a fixed hydrogen yield, heat transfer rate and power consumption are taken as optimization targets, and the corresponding optimal temperature distributions outside the tube, that is, the optimal configurations, are obtained through a nonlinear programming method. In addition, the optimized reactor is also analyzed for three parameters: reactant initial temperature, reactant initial pressure, and reaction tube length. The results indicate that heat transfer rate of the optimal reactor with the minimum heat transfer rate and power consumption of the optimal reactor with the minimum power consumption are reduced by 10.5% and 17.26% compared to the reference reactor, respectively. The optimum parameters of the reactor are obtained as a tube length of 8 m, reactant inlet temperature of 450 K, and reactant inlet pressure of 8 bar. The findings of this research are instructive towards the optimal design and operation of ammonia decomposition reactors.

Thermodynamic and economic analysis of a novel thermoelectric-hydrogen co-generation system combining compressed air energy storage and chemical energy

With the adjustment of energy structure, the proportion of renewable energy is gradually increasing, and how to solve the problem of renewable energy consumption is becoming more and more prominent. Therefore, a novel thermoelectric-hydrogen co-generation system combining compressed air energy storage (CAES) and chemical energy (CE) is proposed. For energy storage, the system uses adiabatic compression with liquid piston to reduce the generation of compression heat, while using the generated compression heat to preheat the methanol. For energy release, the methanol is fed into the methanol steam reforming reactor (MSR) and the methanol decomposition reactor (MDR) in certain proportions for the hydrogen production reaction; the unreacted methanol and the carbon monoxide produced by the MDR are used as make-up heat for the reactors and the high-pressure air before the turbine, while the exhaust waste heat supplies heat to the customer. The thermodynamic, economic and environmental performances of the system were investigated separately by developing a mathematical model describing the system. The results show that under the design conditions, the system has an energy storage density of 12.00 kWh/m3, an energy efficiency of 88.47 %, an exergy efficiency of 77.04 %, a lifetime net present value of 59.20 M$, a payback period of 4 years, and a CO2 emission per unit of energy output of 227.85 kg/MWh. Increasing the thermostatic heat source temperature and increasing the reactor diameter and length increased the methanol conversion rate. Increasing heat exchange effectiveness of the heat exchanger and heat source temperature can all improve system thermodynamic and economic performance. The energy storage density, energy efficiency, net present value and profitability of the system varied parabolically with the reactor tube diameter. The system energy storage density had a maximum value of 12.03 kWh/m3 at a reactor diameter of 0.040 m.

Solar-driven multichannel membrane reactor for hydrogen production from ammonia decomposition

Solar-driven ammonia decomposition is one of the most promising carbon-free pathways to release hydrogen from ammonia. Enhancing the heat and mass transfer processes within an ammonia decomposition membrane reactor is crucial to improve the hydrogen production rate. The multichannel reactors can reduce hydraulic diameters by raising the number of channels while the lateral surface areas of reactors keep the same, which can enhance heat and mass transfer without enlarging re-radiation losses. In this paper, a solar-driven multichannel membrane reactor for ammonia decomposition is proposed, which is promising to improve the conversion without deteriorating the efficiency. Models are developed to simulate the proposed multichannel membrane reactor under solar irradiation. A multichannel membrane reactor with three Pd membrane channels is designed and built. Experiments have been conducted to validate the reactor model. With the validated model, two consecutive parametric studies have been conducted for catalyst volume decreasing and increasing scenarios, respectively. The results show that enlarging permeation area by increasing membrane channels is worthwhile to improve the conversion although the catalyst volume decreases. Under the same solar flux and inlet ammonia properties, a six-channel membrane reactor can achieve a conversion of 0.76, while a single-channel membrane reactor can only achieve a conversion of 0.49. Additionally, the maximum temperature difference within the six-channel reactor is 47 °C lower than that within single-channel membrane reactor, which is favorable for the Pd membrane operating temperature range.

A Comprehensive Investigation on the Direct-Ammonia Thin-Film Solid Oxide Fuel Cells (TF-SOFCs) and the Effect of Porosity-Control of the Anode Support Layer

Ammonia is highly regarded as a hydrogen storage and transportation medium due to its various advantages. Solid oxide fuel cells (SOFCs) can achieve high synergy by using ammonia directly as fuel without the ammonia decomposition reactor and filtration devices. We confirmed the distribution of hydrogen produced by the decomposition of ammonia through 2D multi-physics numerical modeling and predicted the decomposition rate and maximum current density according to the tortuosity. Based on the results, we adjusted the pore volume of the anode-support layer using PMMA to reduce tortuosity and facilitate hydrogen supply and produced anode support layer-anode functional layer substrate. We then manufactured a Thin-film SOFC and tested using hydrogen and ammonia fuel, and achieved high performance of 1897 and 1357 mW/cm2 at 650 °C.

Comprehensive technical analyses of a solid oxide fuel cell turbine-less hybrid aircraft propulsion system using ammonia and methane as alternative fuels

This paper presents a novel hybrid aircraft propulsion system that combines a turbojet engine with an ammonia decomposition reactor and a solid oxide fuel cell system, where the compressor is driven by a solid oxide fuel cell instead of a turbine. Ammonia and methane are selected as alternative fuels to replace kerosene. Technical analyses, including energy and exergy analyses, and comprehensive parametric studies, including engine, flight, fuel cell, and decomposition parameters, are performed, together with quantification of global warming potential (GWP). The results show that the solid oxide fuel cell has a power of 316.68 kW and an electrical efficiency of 42.09%. The hybrid aircraft propulsion system has a thrust of 851.82 N, a specific fuel consumption of 49.93 g/(kN·s) and an exergy efficiency of 22.27%. Compared to a kerosene-fueled turbojet, the hybrid aircraft propulsion system can decease 80.37% of GWP. The optimum choice of engine parameters is a low fuel ratio, a medium pressure ratio and a high air ratio. The best choice of flight parameters is a high Mach number and a medium altitude. Fuel cell parameters cannot achieve high thrusts and low fuel consumptions at the same time. The decomposition temperature should be as high as possible.

A novel fluidized-bed-electrode solid-oxide-fuel-cell reactor for N2O catalytic decomposition

Global warming potential (GWP) of N2O is 310 times that of CO2. However, conventional solid oxide fuel cell (SOFC) cathode catalytic N2O decomposition has been observed to have a low conversion rate, leading to uneven temperature distribution on the cathode surface. To address this issue, we proposed a novel gas–solid phase fluidized bed catalytic electrode for N2O decomposition in a SOFC system. The fluidized bed material was prepared using cerium oxide particles coated with lanthanum, strontium, and iron (CeO2-LSF). The N2O conversion rate was 99.78% at 720 °C. By assisting particle fluidization with argon, compared to the case of fixed bed electrode, the peak power density improved by a maximum of 39.86% at 670 °C. This improvement was due to mass transfer enhancement by particle fluidization, thereby reducing the concentration polarization of the SOFC. Furthermore, the maximum temperature difference inside the reactor decreased significantly from 92 °C to 42 °C when the cathode particles were fluidized. The reactor can achieve high-efficiency decomposition of N2O while simultaneously improving fuel cell power density and operational reliability.

A Conceptual Catalytic Receiver Reactor for Solar Thermal Sulfuric Acid Decomposition

The highest‐temperature step in iodine–sulfur and hybrid–sulfur thermochemical cycles for hydrogen generation is the sulfuric acid decomposition reaction. To efficiently utilize solar energy directly to operate this step, the development of a catalytic solar receiver reactor is essential. A cavity‐type reactor coupled to a solar dish and a numerical analysis of the reactor predicting the reaction conversion as a function of the solar absorption coefficient is presented in this study. The catalytic receiver reactor consists of a double‐walled quartz cylindrical tube to form the cavity and a flat quartz plate window for entry of the concentrated solar radiation. Two catalysts, Fe1.8Cr0.2O3 and Fe2O3/SiO2, are tested in the solar catalytic receiver reactor and SO2 yields of ≈40% and 38% are observed, respectively. Numerical analysis of the reactor is performed and a reaction conversion–absorption coefficient correlation is established. For the catalytic packed bed assuming absorption coefficient of 0.65, a steady‐state temperature of 1212 K is achieved, accomplishing an approximate theoretical efficiency of ≈56%. The numerical analysis suggests that by utilizing a material of construction with high absorption coefficient, significantly enhanced sulfuric acid decomposition can be achieved by the cavity‐type solar receiver reactor.

Key Role of NiCoP Arrays as an Electron Reservoir in a Membrane-Free Electrochemical Reactor for Energy-Saving Hydrogen Recovery and Ammonia Decomposition

In this study, we developed a membrane-free electrochemical reactor by directionally regulating the electron storage release of the NiCoP array electron reservoir, which realized high-efficiency removal of ammonia and simultaneous hydrogen purification. In the ammonia removal cell, indirect oxidation based on electrocatalytic chlorine evolution achieved effective removal of ammonia, while electrons were stored by the NiCoP array auxiliary electrode in the oxidation state at the cathode. In the hydrogen production cell, the electrons released from NiCoP arrays in the reduction state were obtained at the cathode to produce hydrogen with a purity of nearly 100% and a Faraday efficiency of 90.8%. The reactor maintained stable operation during 30 cycles of reversing the position of the two auxiliary electrodes, which was owing to the excellent circulating electron storage release ability of NiCoP arrays. Our proof-of-concept reactor provides a new development idea for energy recovery from wastewater.

A Review on Numerical Simulation of Hydrogen Production from Ammonia Decomposition

Ammonia (NH3) is regarded as a promising medium of hydrogen storage, due to its large hydrogen storage density, decent performance on safety and moderate storage conditions. On the user side, NH3 is generally required to decompose into hydrogen for utilization in fuel cells, and therefore it is vital for the NH3-based hydrogen storage technology development to study NH3 decomposition processes and improve the decomposition efficiency. Numerical simulation has become a powerful tool for analyzing the NH3 decomposition processes since it can provide a revealing insight into the heat and mass transfer phenomena and substantial guidance on further improving the decomposition efficiency. This paper reviews the numerical simulations of NH3 decomposition in various application scenarios, including NH3 decomposition in microreactors, coupled combustion chemical reactors, solid oxide fuel cells, and membrane reactors. The models of NH3 decomposition reactions in various scenarios and the heat and mass transport in the reactor are elaborated. The effects of reactor structure and operating conditions on the performance of NH3 decomposition reactor are analyzed. It can be found that NH3 decomposition in microchannel reactors is not limited by heat and mass transfer, and NH3 conversion can be improved by using membrane reactors under the same conditions. Finally, research prospects and opportunities are proposed in terms of model development and reactor performance improvement for NH3 decomposition.

Carbon-free green hydrogen production process with induction heating-based ammonia decomposition reactor

This study presents an induction heating-based reactor for ammonia decomposition and to achieve a 150 Nm3/h carbon-free green hydrogen production process. The developed metallic monolith reactor acts by increasing the reactor temperature through an electromagnetic induction method using renewable-based electricity. As a result, hydrogen is produced without the generation of air pollutants such as CO2, which are formed via the conventional production pathway. Furthermore, techno-economic analysis was conducted based on exergy and economic analysis to evaluate the feasibility of the developed process. Experimentally, the proposed reactor showed an ammonia conversion of 90.0 % at 600 ℃ and 7 barg. Exergy analysis indicated that the total unused exergy accounted for 45.79 % of the total exergy input, giving an exergy efficiency of 54.21 % for the overall process. Furthermore, the CAPEX and OPEX values are calculated as 1,599,567 USD and 644,719 USD/y, respectively; therefore, the levelized cost of hydrogen (LCOH) was calculated to be 6.98 USD/kgH2. This study also demonstrated that the LCOH varies with the ammonia feed price and the process capacity, and so it would be expected to decrease from 6.98 to 5.33 USD/kgH2 as the hydrogen production capacity is increased from 150 to 500 Nm3/h. Overall, our results confirm the feasibility of carbon-free green hydrogen production on on-site hydrogen refueling stations, and they will be expected to advance the development of an environmental hydrogen economy.

Adsorbents development for hydrogen cleanup from ammonia decomposition in a catalytic membrane reactor

Copper-exchanged faujasite (Cu-FAU) zeolites have been investigated in this work as promising adsorbent materials to further purify hydrogen produced via ammonia decomposition in a membrane reactor. Samples have been prepared via ion-exchange procedure using commercially available NaY, HY and 13X zeolites and their performance was evaluated and compared to the one of their parent zeolites. The introduction of copper species in the zeolites framework was demonstrated to enhance the NH3 useful and saturation capacities of the zeolites. However, the Cu-FAU zeolites synthesized in presence of copper(II)nitrate trihydrate and calcined in air showed significant deactivation after a first adsorption/desorption cycle. Samples characterization revealed that this phenomenon can be attributed to dealumination which is on the other hand prevented when ion-exchange procedure occurs in presence of ammonium hydroxide and inert environment is adopted during calcination. The most promising adsorbent material was found to be the one-time ion-exchanged form of zeolite 13X, showing a useful capacity stable at 3.07 ± 0.39 mmol NH3/gsorbent over ten cycles during which saturation was performed with a He/NH3 mixture containing 3000 ppm of NH3 and regeneration was performed in He. As similar performance has been achieved under operating conditions emulating the outlet stream of a membrane reactor for ammonia decomposition, the one-time ion-exchanged form of zeolite 13X can be regarded as a promising adsorbent material to effectively purify NH3-derived H2 produced via ammonia decomposition in a membrane reactor.