CO2 Dry Reforming Of Methane Research Articles

Reduction effect on the catalytic performances of NiAl-SPC takovite catalysts in syngas synthesis process

In the downstream of the Oil & Gas industry and decline in oil production, the NiAl-HT derived hydrotalciteis a candidate as catalyst to produce syngas in the methane dry reforming process. Hydrotalcite are lamellar compounds of general formulation[M1-x 2+ Mx 3+ (OH) 2]x+[An-] x/n .m H2Owhere the ionic or cationic character can be tuned by the choice of the metal nature and oxidation degree. NiAl-SPC samples were obtained by coprecipitation at constant alkaline pH, then the product was thermal treated at 450°C for 6h to obtain mixed oxides phases. Samples prior and after calcination were characterized by XRD, ICP, BET, FTIR, SEM, TEM, TPR, TGA/DTA and Raman. Catalysts were examined in CO2 dry reforming of methane to examine the influence and the role of the reducibility ability on the catalytic reactivity and stability of NiAl-SPC hydrotalcite generics. They were reduced at 500°C, 600°C, and 700°Cfor 1h to evaluate the effect of its morphology changes on the carbon dioxide reforming of methane carried out at 700°C versus time on stream. It was shown that the reduction conditions strongly influence the reactivity of Ni metallic active phase catalyst, catalytic selectivity and its resistance to carbone deposit for methane reforming by carbon dioxide.This study proposes a further understanding of the synthesis, effects of additives and treatment of hydrotalcite as a catalyst for the DRM reaction. This knowledge will also be beneficial for the development of catalysts for other high temperature industrial applications (ammonia cracking, alcohol to hydrogen conversion...) and for longer term applications such as drug delivery or energy storage materials.

Process optimization and kinetic study for solar-driven photocatalytic methane bi-reforming over TiO2/Ti3C2 supported CoAlLa-LDH-g-C3N4 dual S-scheme nanocomposite

The bireforming of methane (CH4) with carbon dioxide (CO2) and water, called BRM, is a process for generating syngas, which is utilized as a feed for methanol production. The formation of multi-heterojunction by hybridizing cobalt aluminum lanthanum layered double hydroxide (CoAlLa-LDH), and TiO2Anatase/Rutile@Ti3C2 MXene (TiO2A/R@Ti3C2) with graphitic carbon nitride (g-C3N4) to form a g-C3N4/TiO2A/R@Ti3C2/CoAlLa-LDH dual-S-scheme composite performed as an excellent candidate for photocatalytic BRM. The photocatalytic performance was studied for CO2 dry reforming of methane (DRM), bireforming of methane (BRM), and CO2 reduction with H2O. The photocatalytic BRM was found to be an efficient reforming system with high-quality syngas production. The efficiency of the BRM process was then optimized by employing Response Surface Methodology (RSM). In RSM studies, it was inferred that in the photocatalytic BRM at the feed ratio of 1.67 for (CO2/CH4), the CO production reached a maximum with a value of 25.24 μmol at 4.68 h; however, increasing it further caused a decrease in CO production. Furthermore, at a feed ratio of 1.41 for CO2/CH4, the production of H2 reached its maximum with a value of 23.05 μmol at 4.93 h. The hydrogen-rich syngas production demonstrated excellent stability. The photocatalyst stability and regeneration characteristics were studied, demonstrating no decrease in the syngas production or quality.

Atypical stability of exsolved Ni-Fe alloy nanoparticles on double layered perovskite for CO2 dry reforming of methane

Dry reforming of methane simultaneously achieves several sustainability goals: valorizing methane-activating carbon dioxide while producing syngas. The catalyst has an enormous influence on the process viability by controlling activity, selectivity, and stability. A catalyst with uniform-sized Ni-Fe alloy nanoparticles anchored into PrBaMn1.6Ni0.3Fe0.1O5+δ double-layered perovskite is assembled via a facile one-step reduction strategy. Our method attains more exsolved Ni nanoparticles (94 %) than the common conditions. The exsolved Ni0.15Fe0.05 catalyst shows exceptional stability in 260 h tests at 800 °C, with one of the slowest coke formation rates compared with the state-of-the-art catalysts. Besides, no deactivation was observed during 40 h operation at more demanding and coking conditions (14 bar) where this process is more likely to operate industrially. Via experimental characterizations and computational calculations, the stability of the robust exsolved Ni-Fe catalyst is demonstrated by its unique balance of adsorbed species, which inhibits coking.

Low-temperature dry reforming of methane tuned by chemical speciations of active sites on the SiO2 and γ-Al2O3 supported Ni and Ni-Ce catalysts

The cognition of active sites in the Ni-based catalysts plays a vital role and remains a huge challenge in improving catalytic performance of low temperature CO2 dry reforming of methane (LTDRM). In this work, typical catalysts of SiO2 and γ-Al2O3 supported Ni and Ni-Ce were designed and prepared. Importantly, the difference in the chemical speciations of active sites on the Ni-based catalysts is revealed by advanced characterizations and further estimates respective catalytic performance for LTDRM. Results show that larger [Nin0] particles mixed with [Ni-O-Sin]) species on the Ni/SiO2(R) make CH4 excessive decomposition, leading to poor activity and stability. Once the Ce species is doped, however, superior activity (59.0% CH4 and 59.8% CO2 conversions), stability and high H2/CO ratio (0.96) at 600 °C can be achieved on the Ni-Ce/SiO2(R), in comparison with other catalysts and even reported studies. The improved performance can be ascribed to the formation of integral ([Nin0]-[CeIII-□-CeIII]) species on the Ni-Ce/SiO2(R) catalyst, containing highly dispersed [Nin0] particles and rich oxygen vacancies, which can synergistically establish a new stable balance between gasification of carbon species and CO2 dissociation. With respect to Ni-Ce/γ-Al2O3(R), the Ni and Ce precursors are easily captured by extra-framework Aln-OH groups and further form stable isolated ([Nin0]-[Ni-O-Aln]) and [CeIII-O-Aln] species. In such a case, both of them preferentially accelerate CO2 adsorption and dissociation, causing more carbon deposition due to the disproportionation of superfluous CO product. This deep distinguishment of chemical speciations of active sites can guide us to further develop new efficient Ni-based catalysts for LTDRM in the future.

Atypical Stability of Exsolved Ni-Fe Alloy Nanoparticles on Double Layered Perovskite for Co2 Dry Reforming of Methane

Atypical Stability of Exsolved Ni-Fe Alloy Nanoparticles on Double Layered Perovskite for Co2 Dry Reforming of Methane

Enhanced Low-Temperature Co2 Dry Reforming of Methane on in Situ Exsolved Ni/High Entropy Oxide Catalysts

Enhanced Low-Temperature Co2 Dry Reforming of Methane on in Situ Exsolved Ni/High Entropy Oxide Catalysts

Stabilized CO2 reforming of CH4 on modified Ni/Al2O3 catalysts via in-situ K2CO3-enabled dynamic coke elimination reaction

CO2 dry reforming of methane (DRM) is one of the most promising routes for the large-scale utilization of greenhouse gases (CO2 and CH4). However, it is still of challenges to develop catalysts that are efficient and cheap but are of high resistivity in coke formation to maintain long-term stability. Herein, K2CO3 was used as a promoter to enable dynamic coke elimination reaction over the Ni/Al2O3 for CO2 reforming of CH4. K2CO3-modified Ni/Al2O3 catalysts were synthesized via a wet co-impregnation method and investigated for DRM. The 1.0 K-Ni/Al2O3 exhibited the best stability in the test of 96 h on stream at 800 °C. It was found that coke resistance of K2CO3 modified catalyst was significantly improved, as the coke formation on 1.0 K-Ni/Al2O3 catalyst was only 1/3 of that on Ni/Al2O3 catalyst after a long-term test. Characterization results showed that the growth of Ni particles was suppressed because the addition of K2CO3 enhanced the interaction between Ni and Al2O3. Meanwhile, the addition of K2CO3 raises the basicity of the catalysts, which enhances the adsorption of CO2 on the surface and subsequently facilitates CO2 dry reforming of CH4. In addition, the transient experiment reveals that K2CO3 enables a dynamic coke elimination reaction (KCER) via enhancing the catalytic reaction of disordered carbon with CO2, which is considered as a promising low-cost approach to stabilize the performance of the Ni-based catalysts in DRM reaction.

Ultrasonic-Assisted Nano-Nickel Ferrite Spinel Synthesis for Natural Gas Reforming

Recently, attention has been paid to the development of a reforming process that can be used to convert non-combusted natural gas (NG) to value-added products. In this study, a template-free nano-spinel nickel ferrite (Fe70Ni30)-based oxygen carrier is prepared via an ultrasonic assistance method. Its physicochemical properties are characterized using X-ray diffraction, electron paramagnetic resonance, Raman spectra, temperature-programmed reduction, the Brunauer, Emmett and Teller surface area, and transmission electron microscope. The efficiency of Fe70Ni30 is evaluated in CO2 dry reforming of methane, combined dry-steam reforming of methane, and steam activation chemical looping (CL) reforming under atmospheric pressure and various temperatures (600–700 °C). By controlling the reaction temperature higher hydrocarbons (> CH4) are formed directly (at 600 °C), or through the produced syngas (H2/CO ~ 2) at 700 °C which is suitable for the Fischer Tropsch process. In addition, methanol is directly formed and its selectivity increased during the CL reforming reaction under atmospheric pressure and at 700 °C, which considered as mild conditions compared to previously studied methanol production reactions. The prepared Fe70Ni30 catalyst could be used for the reforming of NG streams that contain CH4, CO2 and H2O, which are typical unconventional NG constituents (e.g., of biogenic gas) without complicated pretreatment purification steps.

Rational design of nickel-based catalyst coupling with combined methane reforming to steadily produce syngas

Inhibiting the aggregation of Ni particles and coke deposition on supported nickel catalysts has always been an enormous challenge in methane reforming to syngas. To address the problem, in this study, a Ce-Al-O supported Ni mesoporous catalyst (Ni/Ce-Al-O-A) was designed and synthesized by using evaporation-induced self-assembly (EISA) method and citric acid auto-reduction (AR) method, respectively. The prepared Ni/Ce-Al-O-A catalyst, without further reduction, was used for combined methane dry reforming comprising CO2 dry reforming of methane (DRM) and methane partial oxidation (MPO) to effectively produce syngas. Employing citric acid auto-reduction method for catalyst preparation directly led to the formation of metallic Ni by calcining the precursor of Ni/Ce-Al-O-A in argon atmosphere, with high dispersion and small particle size (at around 4.5 nm) of metallic Ni being obtained. The Ni/Ce-Al-O-A catalyst presented high catalytic activity, better than those of reference catalyst prepared by general impregnation method and the commercial alumina supported Ni catalyst synthesized by citric acid auto-reduction method. In a 250 h lifetime test, the Ni/Ce-Al-O-A catalyst exhibited an extremely catalytic stability and anti-coking ability, and no deactivation was observed. The excellent catalytic activity of Ni/Ce-Al-O-A catalyst was mainly attributed to the Ce-incorporated Ce-Al-O that facilitated the adsorption and activation of CO2 as well as the combined methane reforming (DRM-MPO) in which the existing oxygen could effectively inhibit the coke formation.

Non-thermal plasma-enhanced dry reforming of methane and CO2 over Ce-promoted Ni/C catalysts

A series of Ce-promoted nickel supported activated carbon (NiCexC) catalysts with different molar contents of Ce (0, 0.5 %, 1 %, 3 % and 5 %) were synthesized via a wetness co-impregnation method. Catalytic activity of CO2 dry reforming of methane (DRM) was evaluated in a non-thermal plasma (NTP)-catalytic reactor. Experimental results showed that the introduction of CeO2 could promote the NTP-catalytic DRM reaction. Specifically, NiCe1C catalyst was regarded as the best one due to its excellent conversion of CO2 (53.7 %) and CH4 (55.6 %), as well as a prominent selectivity of H2 (50.0 %) and CO (53.2 %). Moreover, it was also found that NiCe1C could achieve the highest energy efficiency (0.59 mmol kJ−1) compared with NiCe0C (0.52 mmol kJ−1). A strong dual-metals interaction between Ni and CeO2 was found to inhibit the growth of Ni particle, and improve the dispersion of Ni nanoparticles (NPs), thereby the activation energy of CH4 was reduced due to the size effect. The addition of CeO2 created more basic sites with stronger basicity of the catalyst, which was beneficial to increase the adsorption capacity of the reactants, especially the acidic gas CO2. Thus, the conversion of CO2 and CH4 were further improved. Besides, the formation of coke deposition and the participation of carbon support in the reaction could be avoided by controlling CH4/CO2 ratio in the feed gases.

Self-Confinement Created for a Uniform Ir–Ni/SiO2 Catalyst with Enhanced Performances on CO2 Reforming of Methane

Supported Ni and Ir nanocatalysts have been used in CO2 dry reforming of methane (DRM); however, their fast deactivation limited further applications. In this research, we introduced NiO nanopartic...

CO2 dry reforming of CH4 with Sr and Ni co-doped LaCrO3 perovskite catalysts

Catalysts La0.8−xSrxCr0.85Ni0.15O3 (x = 0, 0.1, 0.2 and 0.3; P-80, P-71, P-62 and P-53) are prepared and reduced (R-80, R-71, R-62 and R-53) in H2 for CO2-dry reforming of methane (CO2-DRM). P-80, P-71 and P-62 are single-phase perovskite; P-53 contains additional NiO and SrCrO4. Ni particles are exsolved in R-80, R-71 and R-62 with a strong interfacial interaction; whereas those in R-53 are produced by NiO reduction. Increasing Sr concentration increases basicity and oxygen vacancy concentration of the support. R-53 demonstrates the highest conversion of CH4 and CO2 below 650 °C, which decreases to the lowest above 650 °C due to carbon deposition, while R-62 shows the highest performance with CH4 and CO2 conversions on the level of 90% at 800 °C because of the strong exsolved Ni particle/support interfacial interaction and the high basicity and oxygen vacancy concentration of the support. The performance of R-62 increases with the decrease of gas hourly space velocity (GHSV) from 1.2 to 0.3 × 104 ml g−1 h−1, and remains stable at 750 °C and 0.3 × 104 ml g−1 h−1 with conversions of CH4 and CO2 near 90% and selectivities of H2 and CO above 95%.

Study on a Novel Double-Layer Anode for Solid Oxide Fuel Cells Based on CO2 Dry Reforming of Methane

Solid oxide fuel cell (SOFC) is an energy conversion device that converts chemical energy in fuels into electric energy directly with the advantages of high efficient, clean, and wide fuel adaptability. Most hydrocarbons such as natural gas, ethane and bio-oil can be used as fuels in SOFC. When a hydrocarbon fuel, such as methane (CH4), is directly used for IT-SOFCs without prereforming by adding oxygen, steam or carbon dioxide, it is electrochemically oxidized on the triple-phase boundaries (TPB) with a strong tendency of carbon deposition in the traditional Ni-based anode. In this paper, we introduce an extra internal reforming layer on the surface of anode-support. The layer of a LaCrO3 based perovskite with exsolved Ni nanoparticles catalyst (La0.6Sr0.2Cr0.85Ni0.15O3 showed high stability in reducing atmosphere and excellent catalytic performance. Based on this, two types of anode-supported cell are fabricated by tape casting, screen printing and sintering processes. The first one is a conventional anode supported cell with a configuration of Ni-GDC/GDC/GDC-LSCF (cell 1); and the other contains a reforming layer mixed with La0.6Sr0.2Cr0.85Ni0.15O3 and SDC which was a well coking resistant promoters (cell 2). When CH4–CO2 was used as the fuel, which was supposed to yield syngas with the H2–CO ratio close to unity, the polarization resistance of the cell 1 reach at 0.247 Ω cm2 whereas the value of cell 2 is 0.082Ω cm2 at 750 °C. These results implied that both the physical and the chemical properties of the TPB have been altered drastically during internal dry reforming since that Ni-based anode show poor catalytic performance in reforming and are prone to coking. Consequently, the maximum power density for cell 1 was 470 mW cm-2 and the cell suffered from degradations during a 1 h galvanostatic operation at 1 A cm-2. The performances of the cell 2 are significantly increased above the level of the cell 1, demonstrating a peak power density at 929 mW cm-2 at 750 °C and a stable cell voltage at 1 A cm-2 and 750 °C for 48 h. Carbon deposition in the anode region of the tested cell 2 is not detected, as the La0.6Sr0.2Cr0.85Ni0.15O3 is a more active and stable catalyst than the Ni-based anode-support for dry reforming. Finally we demonstrated the strong interaction between the exsolved nanoparticles and the substrate could prevent coking deposition and proposed a promising configuration of double-layer anode for solid oxide fuel cells with on-cell reforming. Figure 1

Spatial Confinement Effects of Microcapsule Catalyst for Improved Coking‐ and Sintering‐Resistant Behaviors Toward CO2 Reforming of Methane Reaction

The CO2 dry reforming of methane (DRM) reaction is an important technology with high prospects to reduce greenhouse gas emissions while simultaneously producing syngas for industrial usage. To date, the lack of an effective catalyst for the reaction has inhibited its commercialization. The coking and sintering behaviors of the catalysts are key factors for commercial production of syngas from DRM reaction. A microcapsule catalyst prepared by sol–gel method with Ni/ZSM‐5 as core and amorphous SiO2 as shell is successfully synthesized. The characterizations of the catalysts are analyzed using X‐ray powder diffraction (XRD), transmission electron microscopy (TEM), H2 temperature programmed reduction (H2‐TPR), NH3 temperature programmed desorption (NH3‐TPD), and thermogravimetry & differential scanning calorimetry (TGA‐DSC). The spatial confinement of the Ni metal particles between the SiO2 shell and ZSM‐5 suppresses Ni particles aggregation by strengthening the interaction between Ni particles and ZSM‐5 core. The coking‐resistant ability is equally improved. The capsule catalysts isolate the contact between the carbon deposits and the nickel active centre, thus improving the activity of the catalysts. 10Ni/ZSM‐5@SiO2 emerged superior in activity in comparison to other catalysts.

Low-Temperature Catalytic CO2 Dry Reforming of Methane on Ni-Si/ZrO2 Catalyst

The activity of a ZrO2-supported nickel catalyst promoted by silica (Ni-Si/ZrO2) in CO2 dry reforming of methane was carried out at 400 and 450 °C. The catalysts were prepared by an impregnation method and characterized by H2-TPR, XRD, TEM, TG-MS, Raman, XPS, and in situ XPS and DRIFTS. It was discovered that Ni-Si/ZrO2 showed higher initial conversion of CH4 (0.50 s–1) and CO2 (0.44 s–1), and stability for low temperature (400 °C) DRM reaction in comparison to an SiO2-supported nickel catalyst promoted by zirconia (Ni-Zr/SiO2) (0.32 s–1 for both CO2 and CH4). The Ni-Si/ZrO2 catalyst featured the formation of active nickel particles with a small size of 6–9 nm and with slightly strong electronic donor ability, stabilization of the initial metal nickel state under the reaction conditions, and the formation of easily removed C1 coke. However, for the 450 °C DRM reaction, the coke that formed on the Ni-Si/ZrO2 catalyst was mainly C2 coke that was difficult to remove, because the CO2 preferred to combine with...

Ni/Silicalite-1 coating being coated on SiC foam: A tailor-made monolith catalyst for syngas production using a combined methane reforming process

Silicalite-1 zeolite coating was coated on the honeycomb-like monolithic SiC foam via hydrothermal synthesis method. The as-made Silicalite-1-coated SiC (S-1/SiC) was used as catalyst support to prepare a novel supported Ni monolith catalyst (Ni/S-1/SiC) by impregnation method. The Ni/S-1/SiC monolith catalyst was characterized by X-ray diffraction (XRD), N2 physical adsorption, scanning electron microscope (SEM), thermogravimetry (TG), etc. The analysis results of XRD and SEM disclosed that Silicalite-1 coating successfully grew in situ on the SiC surface under the employed hydrothermal conditions. The Ni/S-1/SiC monolith catalyst was employed for syngas production in a combined reforming reaction consisting of CO2 dry reforming of methane (CDRM) and partial oxidation of CH4 (POM). Activity results indicated that the Ni/S-1/SiC monolith catalyst exhibited better catalytic activity than Silicalite-1 supported Ni catalyst (Ni/S-1) and SiC supported Ni (Ni/SiC) catalyst. The Silicalite-1 coating on the Ni/S-1/SiC catalyst combined the SiC support and Ni-based species tightly, leading to the enhanced catalytic performance of Ni/S-1/SiC catalyst. The stability test indicated that the Ni/S-1/SiC monolith catalyst also presented excellent stability and strong resistance to carbon deposition, which was attributed to the high heat conductivity of SiC, the presence of Silicalite-1 being coated on SiC as well as the combined reforming reaction of CDRM-POM. Furthermore, the H2/CO molar ratio of syngas generated in the combined CDRM-POM reaction over Ni/S-1/SiC catalyst could be tuned facilely by adjusting the proportion of O2 coexisting in feed gas.

Carbon nanofibers decorated SiC foam monoliths as the support of anti-sintering Ni catalyst for methane dry reforming

A silicon carbide (SiC) foam monolith decorated with a carbon nanofibers (CNFs) layer was employed as the catalyst support for Ni-based catalyst preparation, used for the CO2 dry reforming of methane (DRM) reaction. The loading amount of CNFs on the SiC foam monolith was 6.6 wt.%, which obviously increased the surface area of the pristine SiC foam from 4 m2/g to 24 m2/g. The prepared CNFs layer strongly attached to the pristine SiC surface and was considerably stable even after 100 h time on stream (TOS) DRM reaction. The CNFs decorated SiC composite support provided more anchorage sites for improving the dispersion of the Ni particles and enhanced the metal-support interaction compared to the pristine SiC support. Compared with other catalysts such as Ni/SiC and Ni/CNFs, the Ni/CNFs-SiC catalyst exhibited not only the highest activity but also remarkable stability during DRM reaction. The XPS and SEM-EDS results showed that the carbon deposition over the nickel surface of Ni/CNFs-SiC catalyst was much less than those of Ni/SiC and Ni/CNFs catalysts. In addition, the XRD analysis verified that almost no sintering of nickel particle was detected over the Ni/CNFs-SiC catalyst, which was prepared with CNFs-SiC composite as catalyst support, even after 100 h TOS DRM reaction at 750 °C.

Co-generation of electricity and syngas on proton-conducting solid oxide fuel cell with a perovskite layer as a precursor of a highly efficient reforming catalyst

Abstract In this study, a proton conducting solid oxide fuel cell (layered H+-SOFC) is prepared by introducing a La2NiO4perovskite oxide with a Ruddlesden-Popper structure as a catalyst layer onto a conventional NiO + BaZr0.4Ce0.4Y0.2O3-δ (NiO + BZCY4) anode for in situ CO2 dry reforming of methane. The roles of the La2NiO4 catalyst layer on the reforming activity, coking tolerance, electrocatalytic activity and operational stability of the anodes are systematically studied. The La2NiO4 catalyst layer exhibits greater catalytic performance than the NiO + BZCY4 anode during the CO2 dry reforming of methane. An outstanding coking resistance capability is also demonstrated. The layered H+-SOFC consumes H2 produced in situ at the anode and delivers a much higher power output than the conventional cell with the NiO + BZCY4 anode. The improved coking resistance of the layered H+-SOFC results in a steady output voltage of ∼0.6 V under a constant current density of 200 mA cm−2. In summary, the H+-SOFC with La2NiO4 perovskite oxide is a potential energy conversion device for CO2 conversion and utilization with co-generation of electricity and syngas.

An in-depth understanding of the bimetallic effects and coked carbon species on an active bimetallic Ni(Co)/Al2O3 dry reforming catalyst.

Ni/Al2O3, Co/Al2O3 and bimetallic Ni(Co)/Al2O3 catalysts were prepared using an impregnation method and employed in CO2 dry reforming of methane under coking-favored conditions. The spent catalysts were carefully characterized using typical characterization technologies and inelastic neutron scattering spectroscopy. The bimetallic catalyst exhibited a superior activity and anti-coking performance compared to Ni/Al2O3, while the most resistant to coking behavior was Co/Al2O3. The enhanced activity of the Ni(Co)/Al2O3 bimetallic catalyst is attributed to the reduced particle size of metallic species and resistance to forming stable filamentous carbon. The overall carbon deposition on the spent bimetallic catalyst is comparable to that of the spent Ni/Al2O3 catalyst, whereas the carbon deposited on the bimetallic catalyst is mainly less-stable carbonaceous species as confirmed by SEM, TPO, Raman and INS characterization. This study provides an in depth understanding of alloy effects in catalysts, the chemical nature of coked carbon on spent Ni-based catalysts and, hopefully, inspires the creative design of a new bimetallic catalyst for dry reforming reactions.

Hydrogen and syn gas production via CO2 dry reforming of methane over Mg/La promoted Co–Ni/MSU-S catalyst

A series of xMg/La yCozNi/MSU-S catalysts were prepared by a sol–gel method and characterized by means of N2-physisorption, FT-IR, H2-TPR, CO2-TPD, H2-TPD, XRD, HRTEM, TG/DSC and O2-TPO techniques. The catalytic performance of the catalysts was evaluated for H2 and syn gas production at different temperatures at atmospheric pressure. The effect of reaction temperature, catalyst composition and performance of the catalyst were investigated during CO2 dry reforming reaction at 700–800 °C with GHSV of 2.4 × 104 mL/g−1 h−1. The results indicated that upon La, Mg and Co promotion, the Ni nanoparticles are highly dispersed on the mesoporous walls of MSU-S via strong interaction between metal ions and the HO–Si-groups of MSU-S. The presence of La2O3 in xLayCozNi/MSU-S results in enhancement of initial catalytic activity as compared to xMgyCozNi/MSU-S. It revealed that 3 La 2Co 7Ni/MSU-S performed the best with highest CH4 and CO2 conversion showing outstanding catalytic activity, greater stability and low coking for 50 h during 75 h time on stream at 750 °C.