Pt-containing Catalysts Research Articles

Fabrications of Au–Pt Bimetallic Heterostructure Electrodes By Ligand-Exchange Assisted Layer-By-Layer Self-Assembly for Hydrogen Evolution Reaction

Platinum (Pt) is a widely utilized electrocatalyst for hydrogen evolution reaction (HER) for water splitting, since the Pt–H bond strength is optimal for hydrogen adsorption and desorption for HER. In order to improve its catalytic activity and stability, previous research reported various types of preparation methods for Pt-containing bimetallic catalysts with noble metals (Ru, Pd, Ag, and Au) or transition metals (Cr, Mn, Fe, Co, Ni, Cu, and Zn) with exhibitions of electronic and bifunctional effects. Among such examples, Au–Pt bimetallic electrocatalysts indicated several advantages, such as d-band shift of active element of Pt lowering binding strength of protons, shifting Pt oxidation potential for improved stability, and increased electron transfer. These catalysts were synthesized by seeded growth, galvanostatic deposition, surface dealloying, and electrodeposition methods. Nevertheless, a facile and effortless synthesis approach must be established to realize large-scale production of multicomponent catalysts.In this study, ligand-exchange assisted layer-by-layer (LbL) self-assembly method was utilized to prepare Au–Pt nanocomposite films for HER electrocatalyst. The ligand-exchange assisted LbL self-assembly technique was used to fabricate metallic nanoparticle (NP) thin films to reduce the amount of insulating organic components, and improves electrical conductivity through metal fusion between metal NPs. Tetraoctylammonium bromide (TOA-Br) ligands on the surface of Au and Pt nanoparticles (NPs) are alternately deposited onto Ti electrodes paired with diethylenetriamine (DETA), a short alkyl amine. This process is accompanied by the removal of the pre-attached bulky surface ligands of TOA-Br. The resulting Au and Pt NP LbL nanocomposite films are characterized by uniform thin-film depositions with a metal-level electrical conductivity (8.7 × 104 S cm-1), which is similar to the bulk metal conductivity. The Au–Pt NP nanocomposite films exhibited 80 mV at a current density of 10 mA cm-2 of HER overpotential under an acidic condition of 0.5 M H2SO4, which corresponds to one-third of that of the control sample of only Pt NP LbL film. The Au–Pt LbL film indicates competitive overpotential (less than 100 mV) despite the ultra-small amount of Pt contents (0.73 wt%), which is suggestive of enhanced catalytic activity. Higher activity could be ascribed to the synergistic effect of bimetallic heterostructure films with the d-band shift, superb electrical conductivity, rapid charge transfer, and increased electrochemical surface area. The suggested synthesis approach is expected to be effective for the fabrications of various electocatalystic thin films for various energy conversion devices.

Influence of the Binder Type on the Activity of Pt-Containing Catalysts Based on MFI Zeolite in Isomerization of the Aromatic С8 Fraction

Influence of the Binder Type on the Activity of Pt-Containing Catalysts Based on MFI Zeolite in Isomerization of the Aromatic С8 Fraction

The enhancing effect of Co2+ on propane non-oxidative dehydrogenation over supported Co/ZrO2 catalysts

Due to the increased production of shale gas containing propane, the share of non-oxidative propane dehydrogenation (PDH) in the large-scale production of propene is expected to continue to grow. There are, however, some ecofriendly and cost shortcomings associated with the currently applied Cr- or Pt-containing catalysts. Against this background, we present here Co/ZrO2 alternatives and reveal the fundamentals affecting their activity, which can be used for purposeful catalyst design. Co2+ species homogeneously distributed within the lattice of ZrO2 significantly increase the activity of coordinatively unsaturated Zr4+ for the PDH reaction. The increase is caused by accelerating both the cleavage of CH bonds in propane and the recombination of surface H species, with the latter reaction being the rate-limiting step. The best-performing catalyst outperformed an analogue of commercial K-CrOx/Al2O3 in terms of the rate of propene formation and demonstrated durable performance over a series of 10 PDH/regeneration cycles under industrially relevant conditions. It also outperformed most previously developed Co-containing catalysts in terms of propene productivity. The space–time yield of propene formation achieved at 57 % equilibrium propane conversion at 550 °C was 0.71 kg·h−1·kgcat-1.

THE SYNTHESIS, STUDY OF PHYSICOCHEMICAL PROPERTIES, AND EVALUATION OF CATALYTIC ACTIVITY OF A THREE-WAY CATALYST MODIFIER CONTAINING EUROPIUM (III) OXIDE

Modification of the applied Pt-containing catalysts with rare-earth metals is one of effective ways to increase their activity and resistance to thermal deactivation, which is associated with both an increase in thermal stability of the texture and structure of the carrier material and an increase in the degree of dispersion and resistance to sintering of the applied platinum metals (PM) when exposed to high temperatures. Conflicting data make it difficult to select a suitable modifier for the use as part of a three-way catalyst in the exhaust treatment system of gasoline-powered cars, whose function is to simultaneously convert CO, CxHy and NOx. In this work, the effect of europium-modified Pt-containing γ-Al2O3 -based catalyst on its physicochemical properties and activity in the oxidation of CO, CxHy, and NOx reduction processes was evaluated. The catalytic activity was evaluated by passing a gas mixture simulating the exhaust of a gasoline-powered car through the catalyst applied onto the surface of a cylindrical honeycomb block with simultaneous measurement of the degree of conversion of toxic components into relatively non-toxic CO2, N2 and H2O in the temperature range from 1000C to 4000C. The modification of the Pt/γ-Al2O3 catalytic system with europium was shown to enhance the activity in all three reactions studied, indicating a great potential for the use as a modifier of a three-way catalyst

Synthesis and application of Pt-containing catalysts based on mordenite zeolite and natural halloysite nanotubes in the gas-phase isomerization of C-8 aromatic fraction

The MOR-type zeolite was synthesized by a template-free method using natural aluminosilicate halloysite nanotubes (HNT) as a hard template and a source of aluminum and silicon. Samples were studied using a complex of physicochemical methods of analysis: XRD, TEM, N2 physisorption, NH3-TPD and XRF. Specific BET surface area of MOR prepared using HNT is 306 m2/g, mesopores in the MOR:HNT accounted for 30 % of the total pore volume. Based on the synthesized materials (MOR, MOR:HNT and MOR + HNT), Pt-containing catalysts were prepared. The catalysts were investigated in the gas-phase isomerization of C-8 aromatic fraction in a temperature range of 360–420 °C, varying LHSV from 2 to 6 h−1, at H2 pressure of 1 MPa and hydrogen/feedstock volume ratio of 900 nl/l. The prepared catalysts demonstrated strong activity in ethylbenzene transformation (more than 95 %), while providing a high yield of p-xylene (more than 95 % of thermodynamic value).

Liquid-phase sorbitol hydrogenolysis over Co catalysts: Effect of external vs endogenous H2 on the product distribution

Aqueous sorbitol hydrogenolysis (6.25 wt% aq. solution) in batch reactor was studied over bare and Pt-modified cobalt aluminate-based catalysts at distinct reaction atmospheres (N2 and H2 pressurized) focusing on the correlation between the physico-chemical properties of catalysts and the product distribution. It was found that over trimetallic xPt/CoAl catalysts (x = 0.3 and 1 wt%) operating at 240 °C and hydrogen pressure (60 bar) resulted in a yield of 27–35 molC % C5-6 hydrocarbons. Under inert atmosphere, the highest yield (57–70 molC %) was to monofunctional products with only one oxygen functionality, for all catalysts. A preferential retro-aldol condensation route is manifest. Post-reaction analyses showed less structural and chemical modification in the Pt-containing catalysts and a slight positive difference in those used under hydrogen pressure over those used under inert atmosphere.

Partial oxidation of dimethoxymethane to syngas over granular and structured Pt-based catalysts

The catalytic properties of supported Pt-containing catalysts for dimethoxymethane partial oxidation (DMM PO) into syngas was studied in a tubular fixed bed reactor at atmospheric pressure and relatively low temperatures (∼300–500 °C). Comparative studies of granular 0.5–1.9 wt % Pt/Ce0.75Zr0.25O2–δ and structured 0.08 wt% Pt/8 wt% Ce0.75Zr0.25O2–δ/6 wt% η-Al2O3/FeCrAl catalysts in DMM PO were performed. The SEM and STEM HAADF techniques were used for catalyst characterization. The structured catalyst was proved promising for producing syngas by the DMM PO reaction for SOFC feeding applications. In particular, at atmospheric pressure, temperature 400 °C, and the reaction mixture (28.6 vol% DMM, 14.3 vol% O2, 57.1 vol% N2) feed rate of 5 L/(g·h), this catalyst provided complete conversion of DMM and O2 to syngas with a total H2 and CO content of 69 vol% and syngas productivity of ∼8 L/(g · h).

Anodic and Cathodic Platinum Dissolution Processes Involve Different Oxide Species.

The degradation of Pt-containing oxygen reduction catalysts for fuel cell applications is strongly linked to the electrochemical surface oxidation and reduction of Pt. Here, we study the surface restructuring and Pt dissolution mechanisms during oxidation/reduction for the case of Pt(100) in 0.1 M HClO4 by combining operando high-energy surface X-ray diffraction, online mass spectrometry, and density functional theory. Our atomic-scale structural studies reveal that anodic dissolution, detected during oxidation, and cathodic dissolution, observed during the subsequent reduction, are linked to two different oxide phases. Anodic dissolution occurs predominantly during nucleation and growth of the first, stripe-like oxide. Cathodic dissolution is linked to a second, amorphous Pt oxide phase that resembles bulk PtO2 and starts to grow when the coverage of the stripe-like oxide saturates. In addition, we find the amount of surface restructuring after an oxidation/reduction cycle to be potential-independent after the stripe-like oxide has reached its saturation coverage.

Platinum(IV) Carbonato Complexes: Formation via the Addition of CO2 to the [Pt(OH)6]2- Anion and Generation of Platinum(IV) Oxide Nanoparticles for the Preparation of Catalysts.

A combination of multinuclear nuclear magnetic resonance spectroscopy and theoretical calculation based on density functional theory was used for a speciation study of Pt in solutions prepared either by the interaction of [Pt(OH)6]2- with gaseous CO2 in an alkaline solution of platinum(IV) hydroxide ([Pt(OH)4(H2O)2]) or by the dissolution of [Pt(OH)4(H2O)2] in an aqueous KHCO3 solution. The formed solutions contained coexisting Pt(IV) carbonato complexes with κ1- and κ2-coordination modes. The gradual condensation of mononuclear Pt species in such bicarbonate solutions resulted in the formation of PtO2 nanoparticles aggregating into a solid precipitate on prolonged aging. The deposition of PtO2 particles from bicarbonate solutions was adapted for the preparation of Pt-containing heterogeneous catalysts: bimetallic Pt-Ni catalysts were prepared using various supporting materials (CeO2, SiO2, and g-C3N4) and tested for the activity in hydrazine-hydrate decomposition. All prepared materials showed high selectivity with respect to H2 production from the hydrazine-hydrate with PtNi/CeO2 showing the highest rate of H2 evolution. In the long-range evaluation, the PtNi/CeO2 catalyst operating at 50 °C showed an exceptional turnover number value of 4600 producing hydrogen at a 97% selectivity level and with a mean turnover frequency value of about 470 h-1. In the case of the PtNi/g-C3N4 catalyst, for the first time, the photodriven decomposition of hydrazine-hydrate was shown to enhance the productivity of the catalyst by 40%.

New insight on the study of electrocatalytic oxidation of methanol on some Pt group metals: Important methodological aspects

The synthesis of novel Pt-containing catalysts to achieve the high electrocatalytic activity in methanol oxidation reaction is the one of important directions in modern direct methanol fuel cells research and design. However, the comparison of results of electrochemical experiments shown in various works for different compositions of catalyst is practically impossible due to various conditions of experiments used by different authors’ groups. Hence, the importance of the methodology in study of electrochemical properties of Pt-containing catalysts discussed in the current work becomes evident. The Pt/C and PtRu/C commercial catalysts and also model systems with Pd, Rh, Ru, PtRu particles electrodeposited on glassy carbon electrode surface were used to specify the methodological aspects of comparative characterization of catalysts with various composition. The role of several important factors such as the methodology of electroactive surface area estimation, the nature of model acid electrolyte, polarization mode (potential range using in CV), polarization regime used for modeling of catalyst work in DMFC, medium pH and influence of methanol oxidation intermediates was discussed. It is shown that CO desorption is more appropriate method (with proposed modifications) for ECSA estimation; HClO4 is more favorable electrolyte for model experiments with catalysts when Nafion suspension is used as a binding agent. The polarization in CV mode in the potential range including the hydrogen adsorption region leads to local (near the electrode) pH changes, which results in increase in concentration (correlates with forward peak current density) of main electroactive species, gem-diolate, in methanol solution. The use of diluted methanol solutions allows to increase the efficiency of fuel consumption and decrease the overpotential of methanol oxidation reaction due to more favorable ratio of concentrations of electroactive and oxygen species adsorbed on the electrode surface.

Decomposition of methanol to syngas on supported Pt-containing catalysts

Properties of supported Pt-containing granular (Pt/Ce0.75Zr0.25O2–δ) and monolithic structured (Pt/Ce0.75Zr0.25O2–δ /η-Al2O3 /FeCrAl) catalysts were studied in the methanol decomposition to syngas for feeding solid oxide fuel cells (SOFC). The application of the monolithic structured catalyst in the methanol decomposition reaction was shown to be promising. The addition of a small oxygen amount to the initial mixture was found to prevent the formation of carbon, thus enhancing the stability of catalyst operation. The proposed monolithic structured catalyst 0.15 wt.% Pt/8 wt.% Ce0.75Zr0.25O2–δ /6 wt.% η-Al2O3 /FeCrAl at atmospheric pressure, temperature of ca. 400 °C, feed rate of the reaction mixture 5.6 L/(gcat·h) and volumetric ratio СН3ОН/air = 1 can provide the complete conversion of methanol to syngas with the total content of H2 and СО of ca. 64 vol.% and the syngas output of ca. 6.7 L(Н2 + СО)/(gcat· h).

The formation of active phases in Pt-containing catalysts for bicyclohexyl dehydrogenation in hydrogen storage.

The fundamental role of the carbon carrier Sibunit® in the formation of active and selective phases in low-percentage Pt-containing catalysts Pt/C, Pt/Ni/C, Pt/Ni-Cr/C for the complete dehydrogenation of bicyclohexyl into biphenyl (320 °C, 1 atm) is shown. The Pt/Ni-Cr/C catalyst showed the greatest activity and selectivity in the complete dehydrogenation of bicyclohexyl into biphenyl. Detailed analysis of the catalyst surface by XPS, TEM-HR and EDX methods revealed two main processes associated with the high activity and successful course of the reaction of bicyclohexyl dehydrogenation: the formation of an active carbide Pt1-xCx phase and graphitization of the carbon carrier. Both these processes are realized equally in the Pt/Ni-Cr/C catalyst demonstrating the highest activity. The formation of the Pt1-xCx carbide phase at a low extent of graphitization of the catalyst surface is predominant for the Pt/C catalyst. Graphitization of the carbon carrier is most pronounced for Pt/Ni/C, where the yield of biphenyl is significantly reduced. The formation of graphite for the Pt/Ni/C catalyst at the metal-carrier interface leads to the encapsulation of a metal particle in a graphite shell, which apparently determines its low activity in the conversion of bicyclohexyl.

Simultaneous Isomerization of Hexane and Heptane in the Presence of Pt-Containing Tungstated Zirconia Catalysts

Isomerization of heptane and hexane and their mixtures in the presence of Pt/WO3-ZrO2 catalysts with the tungsten oxide content of 10–35 wt.% was studied. The best characteristics of isomerization of the С6–С7 alkanes mixture were observed on the catalysts with the WO3 content of 15–20 wt.%. According to ammonia thermodesorption data, the number of acid sites typically increases in this range of tungsten oxide content; according to IR spectroscopy of adsorbed CO, this occurs mostly with an increase in the number of Broensted acid sites.

Novel Mechanically Assisted Dissolution of Platinum Using Cerium(IV) Oxide

Platinum group metals (PGMs) are important for a variety of applications, including catalysis; however, the amounts mined are inadequate relative to global requirements. Therefore, methods for the recovery of PGMs from spent resources are urgently required. Herein, we report that platinum (Pt) can be dissolved by hydrochloric acid (HCl) alone using cerium(IV) oxide (CeO2) as a solid oxidizing agent, which can minimize the highly corrosive chlorine. Pt-containing catalysts were subjected to high-energy ball milling in the presence of CeO2, and their dissolution behavior in HCl was subsequently investigated. Ball milling was found to promote direct Pt-oxidation, as indicated by the significantly increased solubility in HCl. Several analytical techniques, including X-ray diffractometry, surface area and pore size analysis, X-ray photoelectron spectroscopy, ultraviolet–visible spectroscopy, inductively coupled plasma mass spectrometry, and atomic emission spectroscopy, were used for characterization. This study demonstrates the environmentally acceptable characteristics of high-energy ball milling and its applicability in the recycling of important noble metal substances from waste materials.

Effect of reduction temperature on the activity of Pt-Sn/Al2O3 catalysts for propane dehydrogenation

Due to the growing attention toward the propane dehydrogenation (PDH) process, the understanding of Pt-containing bimetallic catalysts, especially Pt-Sn systems that are widely applied in PDH, is essential for improving the efficiency of PDH. While the reduction of PtSn catalysts for PDH process is crucial, it has yet to be thoroughly investigated. In this study, we prepared Pt-Sn/Al2O3 catalysts with 3 wt. % Pt and 4.5 wt. % Sn loadings and reduced these catalysts at different temperature of 100–600 ℃. The prepared catalysts were characterized via H2-temperature programmed reduction (TPR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), CO-diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), Raman spectroscopy, and transmission electron microscopy (TEM). Their catalytic activity for PDH was also evaluated. As the reduction temperature increased, the catalytic activity also increased. The catalyst reduced at 300 ℃ exhibited the highest conversion of propane. However, beyond the reduction temperature of 300 ℃, propane conversion decreased. Based on XRD results, as the reduction temperature increased, Pt particles of the calcined catalyst were transformed to Pt3Sn alloys and then to PtSn alloys, which were sintered at higher reduction temperatures. Based on characterization studies, the decrease in catalytic activity at higher reduction temperatures could be attributed to the formation and sintering of PtSn as well as the blocking of Pt-Sn particles by Sn species. TPR and CO-DRIFTS results suggested that the moderate interaction between Pt and Sn was more suitable for PDH reaction. The optimized reduction temperature of 300 ℃ obtained in this study that was lower than the commercially adopted reaction conditions could trigger the optimal reduction process design for PDH.

Micro-mesoporous catalysts based on ZSM-5 zeolite synthesized from natural clay nanotubes: Preparation and application in the isomerization of C-8 aromatic fraction

Micro-mesoporous zeolite with ZSM-5 morphology was successfully synthesized by soft template and template-free methods using natural halloysite aluminosilicate nanotubes as a hard template and a source of aluminum and silicon. Formation of ZSM-5 crystal structure was confirmed by XRD. Textural properties and structural characteristics of functional materials, supports, and Pt-containing catalysts were examined by N2 physisorption, NH3-TPD, Py-FTIR, TEM, SEM, XRF techniques. Specific BET surface area of ZSM-5 zeolite prepared using TPABr as an organic template (ZSM-5(t):HNT) is 583 m2/g, whereas for the template-free counterpart (ZSM-5(tf):HNT) it reaches 225 m2/g. According to the Py-FTIR data, concentrations of Brønsted acid sites for ZSM-5(t):HNT and ZSM-5(tf):HNT are 295 and 93 μmol/g, whereas concentrations of Lewis acid sites are 79 and 41 μmol/g, respectively. Activity and selectivity of Pt catalysts based on the micro-mesoporous ZSM-5 zeolite-derived supports were evaluated in isomerization of C-8 aromatic fraction depending on the process conditions (temperature, feed space velocity). Because of the hierarchical micro-mesoporous structure, both catalysts provide xylenes transformation through the two isomerization routes (intra- and intermolecular). However, for the catalyst based on support synthesized through the template-free methods, the monomolecular reaction route is more preferable, and therefore the number of side reactions (disproportionation, transalkylation, and dealkylation) decreases.

Catalytic Hydrogen Storage Systems Based on Hydrogenation-Dehydrogenation Reactions

Hydrogen accumulation, storage and production systems are the important direction in the development of fundamental and applied aspects of alternative energy. Liquid organic hydrogen carriers (LOHC), polycyclic forms of the corresponding aromatic compounds, are an efficient way of hydrogen storage and release with a hydrogen content of up to 7.3 mas.%. This article compares LOHC as potential substrates for hydrogen storage and hydrogen evolution based on catalytic hydrogenation-dehydrogenation reactions, including cyclohexane, methylcyclohexane, decalin, perhydroterphenyl, bicyclohexyl, perhydrodibenzyltoluene and perhydroethylcarbazole. For each of the perhydrogenated substrates, data on the activity and selectivity of Pt-containing dehydrogenation catalysts are presented.

The role of the Pd ratio in increasing the activity of Pt for high efficient hydrogen evolution reaction

• Mono and bimetallic catalysts were prepared with one-step procedure. • The ratio of metals that make up the bimetallic catalyst plays a critical role in the electroactivity. • Pt 2 Pd 1 /C catalyst showed superior performance among all catalysts. • Pt 2 Pd 1 /C has excellent long-term stability in an acidic environment. The use of Pt nanoparticles as electrocatalysts is common in the hydrogen evolution reaction, which stands out as a promising strategy for the production of hydrogen. However, improving the electroactivity and durability of Pt-containing catalysts is an important step for the commercialization of these catalysts. In this study, in order to increase the HER activity of the Pt catalyst, which is widely used for HER, carbon supported PtPd catalysts in different atomic ratios, were prepared by adding Pd as a second metal nearby Pt, on HER performance effect was investigated. These ratios determined as (1:1), (1:2), and (2:1). The prepared catalysts were characterized by XRD, TEM, ICP-MS, EDS, XPS and information about their structural and morphological aspects was obtained. In addition, the electrochemical properties of the catalysts were determined by CV analysis in an acidic medium, and the HER activities of the catalysts were compared using linear sweep voltammetry and chronoamperometry (CA) measurements. As a result of electrochemical measurements, it was found that Pt 2 Pd 1 /C catalyst had the best HER activity. For this reason, we emphasize the necessity of investigating the effect of the composition and structure of the electrocatalysts on the HER activity.

Dehydrogenation of Propane and n-Butane Catalyzed by Isolated PtZn4 Sites Supported on Self-Pillared Zeolite Pentasil Nanosheets

Propene and 1,3-butadiene are important building-block chemicals that can be produced by dehydrogenation of propane and butane on Pt catalysts. A challenge is to develop highly active and selective catalysts that are resistant to deactivation by Pt sintering and coke formation. We have recently shown (Qi , J. Am. Chem. Soc. 2021, 143, 21364−21378) that these objectives can be met for propane dehydrogenation (PDH) using atomically dispersed Pt anchored to neighboring ≡SiOZn-OH groups bonded to the framework of dealuminated zeolite BEA. In the present study, we demonstrate that significantly superior performance can be achieved using self-pillared pentasil (SPP) zeolite nanosheets as supports. Following catalyst reduction in H2, atomic resolution, scanning transmission electron microscopy (STEM), and X-ray absorption spectroscopy (XAS) indicate that Pt is stabilized in structures well approximated as (≡Si-O-Zn)4-5Pt. These species are highly active, selective, and stable for PDH to give propene and for n-butane dehydrogenation (BDH) to give 1,3-butadiene. No catalyst deactivation was observed after 12 days of time on stream, and the selectivity remained at nearly 100% for PDH conducted at 823 K and a weight hourly space velocity (WHSV) of 1350 h–1. The apparent rate coefficient for PDH on this catalyst is significantly higher than that reported previously for Pt-containing catalysts. For BDH at 823 K and a WHSV of 3560 h–1, the selectivity to butene isomers and 1,3-butadiene is 98.9%, and the selectivity to 1,3-butadiene is 45%. We propose that the high catalyst stability observed during PDH and BDH is a consequence of a large fraction of the Pt-containing centers being located on the external surface of the zeolite nanosheets, where nascent coke precursors can desorb before condensing to form coke.

Mathematical and Kinetic Study of Horiuti-Polanyi Reaction Mechanism for the Methylcyclohexane Dehydrogenation Over Various Pt/Al2O3 Catalysts

The Horiuti-Polanyi (HP) mechanism has been studied for the methylcyclohexane dehydrogenation reaction over a Pt/AlO catalyst. Three HP mechanistic schemes such as competitive, non-competitive, and combined-competitive-non-competitive were used in the kinetic modeling of the experimental data. The loss of first hydrogen atom was regarded as the rate-determining step and the mathematical expressions were developed and fitted against the data. A FORTRAN routine was employed where 4th order Runge-Kutta method was used to solve the related differential equation and Marquardt algorithm was used for the parametric estimation. A kinetically and statistically best-fit HP kinetic equation was obtained with 87.96 kJ/mol of activation energy. The best-fit kinetic model was tested with five additional Pt-containing AlO catalysts and yet again found in good agreement with the experimental data.