A highly active and synergistic Pt/Mo2C/Al2O3 catalyst for water-gas shift reaction

Osman, Ahmed I.; Abu‐Dahrieh, Jehad K.; Cherkasov, Nikolay; Fernández-García, Javier; Walker, David; Walton, Richard I.; Rooney, David; Rebrov, Evgeny V.

doi:10.1016/j.mcat.2018.05.025

Cited by 38 publications

(15 citation statements)

References 34 publications

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“…The performance of Pt catalysts loaded on different supports, Mo 2 C/η-Al 2 O 3 , Mo 2 C/γ-Al 2 O 3 , or Mo 2 C, were tested by Osman et al for low-temperature WGS reaction [34], where Pt/Mo 2 C/η-Al 2 O 3 was found to be a promising catalyst with 44% CO conversion at 180°C. However, 4 wt% Pt-Mo 2 C ( Fig.…”

Section: Noble Metal Basedmentioning

confidence: 99%

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A review of recent advances in water-gas shift catalysis for hydrogen production

2020

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The water-gas shift reaction (WGSR) is an intermediate reaction in hydrocarbon reforming processes, considered one of the most important reactions for hydrogen production. Here, water and carbon monoxide molecules react to generate hydrogen and carbon dioxide. From the thermodynamics aspect, pressure does not have an impact, whereas low-temperature conditions are suitable for high hydrogen selectivity because of the exothermic nature of the WGSR reaction. The performance of this reaction can be greatly enhanced in the presence of suitable catalysts. The WGSR has been widely studied due do the industrial significance resulting in a good volume of open literature on reactor design and catalyst development. A number of review articles are also available on the fundamental aspects of the reaction, including thermodynamic analysis, reaction condition optimization, catalyst design, and deactivation studies. Over the past few decades, there has been an exceptional development of the catalyst characterization techniques such as near-ambient x-ray photoelectron spectroscopy (NA-XPS) and in situ transmission electron microscopy (in situ TEM), providing atomic level information in presence of gases at elevated temperatures. These tools have been crucial in providing nanoscale structural details and the dynamic changes during reaction conditions, which were not available before. The present review is an attempt to gather the recent progress, particularly in the past decade, on the catalysts for lowtemperature WGSR and their structural properties, leading to new insights that can be used in the future for effective catalyst design. For the ease of reading, the article is divided into subsections based on metals (noble and transition metal), oxide supports, and carbon-based supports. It also aims at providing a brief overview of the reaction conditions by including a table of catalysts with synthesis methods, reaction conditions, and key observations for a quick reference. Based on our study of literature on noble metal catalysts, atomic Pt substituted Mn 3 O 4 shows almost full CO conversion at 260°C itself with zero methane formation. In the case of transition metals group, the inclusion of Cu in catalytic system seems to influence the CO conversion significantly, and in some cases, with CO conversion improvement by 65% at 280°C. Moreover, mesoporous ceria as a catalyst support shows great potential with reports of full CO conversion at a low temperature of 175°C.

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Section: Noble Metal Basedmentioning

confidence: 99%

“…Along with synthesis of the Pt@TiO 2 yolk/shell nanospheres [33]. g SEM image of deactivation over 85 h of time on stream (TOS) at 250°C temperature, maintaining over 70% CO conversion [34]. This improved performance was attributed to a uniform distribution of smaller Pt nanoparticles on Mo 2 C structure compared to other supports.…”

Section: Noble Metal Basedmentioning

confidence: 99%

A review of recent advances in water-gas shift catalysis for hydrogen production

2020

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“…Owing to these excellent properties, MoS 2 and its based nanocomposites have been extensively studied in many fields and applications like catalysis, energy storage, supercapacitors, and Li-ion batteries (Osman et al 2018).…”

Section: Molybdenum Disulfidementioning

confidence: 99%

Advanced materials and technologies for supercapacitors used in energy conversion and storage: a review

et al. 2020

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Supercapacitors are increasingly used for energy conversion and storage systems in sustainable nanotechnologies. Graphite is a conventional electrode utilized in Li-ion-based batteries, yet its specific capacitance of 372 mA h g −1 is not adequate for supercapacitor applications. Interest in supercapacitors is due to their high-energy capacity, storage for a shorter period and longer lifetime. This review compares the following materials used to fabricate supercapacitors: spinel ferrites, e.g., MFe 2 O 4 , MMoO 4 and MCo 2 O 4 where M denotes a transition metal ion; perovskite oxides; transition metals sulfides; carbon materials; and conducting polymers. The application window of perovskite can be controlled by cations in sublattice sites. Cations increase the specific capacitance because cations possess large orbital valence electrons which grow the oxygen vacancies. Electrodes made of transition metal sulfides, e.g., ZnCo 2 S 4 , display a high specific capacitance of 1269 F g −1 , which is four times higher than those of transition metals oxides, e.g., Zn-Co ferrite, of 296 F g −1. This is explained by the low charge-transfer resistance and the high ion diffusion rate of transition metals sulfides. Composites made of magnetic oxides or transition metal sulfides with conducting polymers or carbon materials have the highest capacitance activity and cyclic stability. This is attributed to oxygen and sulfur active sites which foster electrolyte penetration during cycling, and, in turn, create new active sites.

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“…The supports significantly affect the catalytic performance in this reaction. Osman et al found that using acidic supports led to different interaction and synergetic effect between the two most active phases of Pt metal and Mo 2 C, thus the acidity played a crucial role herein [52]. Metal nanoparticles supported on reducible metal oxides show great catalytic performance in this field.…”

Section: Water-gas Shift Reaction (Wgsr)mentioning

confidence: 99%

Recent In Situ/Operando Spectroscopy Studies of Heterogeneous Catalysis with Reducible Metal Oxides as Supports

2019

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For heterogeneous catalysis, the metal catalysts supported on reducible metal oxides, especially CeO2 and TiO2, have long been a research focus because of their excellent catalytic performance in a variety of catalytic reactions. Detailed understanding of the promotion effect of reducible metal oxides on catalytic reactions is beneficial to the rational design of new catalysts. The important catalytic roles of reducible metal oxides are attributed to their intimate interactions with the supported metals (e.g., strong metal-support interaction, electronic metal-support interaction) and unique support structures (e.g., oxygen vacancy, reversible valence change, surface hydroxyl). However, the structures of the catalysts and reaction mechanisms are strongly affected by environmental conditions. For this reason, in situ/operando spectroscopy studies under working conditions are necessary to obtain accurate information about the structure-activity relationship. In this review, the recent applications of the in situ/operando spectroscopy methodology on metal catalysts with reducible metal oxides as supports are summarized.

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A highly active and synergistic Pt/Mo2C/Al2O3 catalyst for water-gas shift reaction

Cited by 38 publications

References 34 publications

A review of recent advances in water-gas shift catalysis for hydrogen production

A review of recent advances in water-gas shift catalysis for hydrogen production

Advanced materials and technologies for supercapacitors used in energy conversion and storage: a review

Recent In Situ/Operando Spectroscopy Studies of Heterogeneous Catalysis with Reducible Metal Oxides as Supports

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