Development of New Gold Catalysts for Removing CO from H<sub>2</sub>

Ma, Zhen; Tao, Franklin Feng; Gu, Xiaoli

doi:10.1002/9781118843468.ch10

Cited by 4 publications

(4 citation statements)

References 149 publications

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“…A beneficial promotional role of various metal oxides defined as “active,” such as MnO x , CeO 2 , CuO x , Fe 2 O 3 , and CoO x , and “inactive,” like ZnO and MgO, on the catalytic performance for PROX over Au/TiO 2 has been reported. Ma et al (2015) have also reviewed the progress in developing new gold catalysts for PROX, focusing on materials of complex metal–support interfaces. Application of various modified metal oxides or mixed metal oxides for preparation of gold catalysts was reported together with studies of bimetallic nanoparticles on the same supports.…”

Section: Well-performing Gold Catalysts For Additional Hydrogen Cleanmentioning

confidence: 99%

“…291, 2005; Chemical Society Reviews , vol. 37, 2008; two SI in Catalysts: “Gold Catalysts”, 2011 and “New Trends in Gold Catalysts”, 2013), many chapters and reviews (Bond and Thompson, 1999; Haruta, 2002, 2003, 2004; Hashmi, 2007; Hutchings, 2007; Yan et al, 2007; Carabineiro and Thompson, 2010; Gong, 2012; Hutchings and Edwards, 2012; Barakat et al, 2013; Guan et al, 2015; Ma et al, 2015), and a huge number of papers have tackled fundamental and applied aspects related to gold-based catalyst preparation methods and their impact on gold particle size, shape, and oxidation state, role of the nature of support and support effects, relationship between electronic and structural properties of the gold-based catalysts, and catalytic performance in various reactions. Many research efforts have been focused on elucidating a surprisingly high effectiveness of supported gold nanoparticles in a wide variety of processes.…”

Section: Introductionmentioning

confidence: 99%

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Recent Advances in Design of Gold-Based Catalysts for H2 Clean-Up Reactions

Tabakova

2019

Front. Chem.

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Over the past three decades, supported gold nanoparticles have demonstrated outstanding properties and continue to attract the interest of the scientific community. Several books and comprehensive reviews as well as numerous papers cover a variety of fundamental and applied aspects specific to gold-based catalyst synthesis, characterization by different techniques, relationship among catalyst support features, electronic and structural properties of gold particles, and catalytic activity, reaction mechanism, and theoretical modeling. Among the Au-catalyzed reactions targeting environmental protection and sustainable energy applications, particular attention is paid to pure hydrogen production. The increasing demands for high-purity hydrogen for fuel cell systems caused a renewed interest in the water–gas shift reaction. This well-known industrial process provides an attractive way for hydrogen generation and additional increase of its concentration in the gas mixtures obtained by processes utilizing coal, petroleum, or biomass resources. An effective step for further elimination of CO traces from the reformate stream after water–gas shift unit is the preferential CO oxidation. Developing highly active, stable, and selective catalysts for these two reactions is of primary importance for efficient upgrading of hydrogen purity in fuel cell applications. This review aims to extend the existing knowledge and understanding of the properties of gold-based catalysts for H 2 clean-up reactions. In particular, new approaches and strategies for design of high-performing and cost-effective formulations are addressed. Emphasis is placed on efforts to explore appropriate and economically viable supports with complex composition prepared by various synthesis procedures. Relevance of ceria application as a support for new-generation WGS catalysts is pointed out. The role of the nature of support in catalyst behavior and specifically the existence of an active gold–support interface is highlighted. Long-term stability and tolerance toward start-up/shutdown cycling are discussed. Very recent advances in catalyst design are described focusing on structured catalysts and microchannel reactors. The latest mechanistic aspects of the water–gas shift reaction and preferential CO oxidation over gold-based catalysts from density functional theory calculations are noted because of their essential role in discovering novel highly efficient catalysts.

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Section: Well-performing Gold Catalysts For Additional Hydrogen Cleanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent Advances in Design of Gold-Based Catalysts for H2 Clean-Up Reactions

Tabakova

2019

Front. Chem.

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“…Overall there are many studies on thermal WGSRs [5,10,[33][34][35][36] and the PROX of CO [20,22,24,37,38] on Au/TiO 2 , but only a few investigations have reported on photoassisted WGSRs [14] and the PROX of CO [26,27], and further studies are required to acquire a fundamental understanding of these reactions. We have opted to study an unusually high loading of Au (8 wt.%) on TiO 2 P25.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic-Assisted Water–Gas Shift Reaction of Gold Particles on TiO2

Wahab,

Mudiyanselage,

Idriss

2023

Catalysts

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The Localized Surface Plasmon (LSP) effect of 5 nm mean size Au particles deposited on TiO2 P25 was investigated during the photo-thermal water gas shift reaction (WGSR). The effects of CO concentration, excitation light flux and energy, and molecular oxygen addition during the reaction were investigated. The photocatalytic WGSR rate under light excitation with wavelengths extending from 320 to 1100 nm was found to be higher than the thermal reaction alone at the same temperature (85 °C). A H2/CO2 ratio of near unity was found at high concentrations of CO. The addition of molecular oxygen during the reaction resulted in a slight decrease in molecular hydrogen production, while the rates of CO2 formation and CO consumption changed by one order of magnitude. More importantly, it was found that the WGSR rates were still high under only visible light excitation (600–700 nm). The results prove that Au LSP alone triggers this chemical reaction without requiring the excitation of the semiconductor on which they are deposited.

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“…Ma and co-workers recently discovered that the phase and structure of the Mo2C was crucial to high catalytic activity. [49] In a paper reported from Posada-Pérez and co-workers, β-MoCx was used as the support, but when they used instead α-MoC, the activity of the supported Au catalyst was dramatically improved for WGS reaction. [48] The origin of the high catalytic activity was concluded to be the facile activation of water molecules, which was observed at temperatures as low as 303 K and attributed to the presence of reversible calcination-carbonization conditions, but also revealed that Au/MoCx exhibited high activity for the WGS at low temperature.…”

Section: Transition Metal Carbides As Supportsmentioning

confidence: 99%

CeOx-ZrO2 porous nanorods decorated with Au nanoparticles for the catalysis of preferential oxidation of carbon monoxide (PrOX-CO)

Santos¹

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Antonio Pigafetta, a Florentine navigator who went with Magellan on the first voyage around the world, wrote, upon his passage through our southern lands of America, a strictly accurate account that nonetheless resembles a venture into fantasy. In it he recorded that he had seen hogs with navels on their haunches, clawless birds whose hens laid eggs on the backs of their mates, and others still, resembling tongueless pelicans, with beaks like spoons. He wrote of having seen a misbegotten creature with the head and ears of a mule, a camel's body, the legs of a deer and the whinny of a horse. He described how the first native encountered in Patagonia was confronted with a mirror, whereupon that impassioned giant lost his senses to the terror of his own image. This short and fascinating book, which even then contained the seeds of our present-day novels, is by no means the most staggering account of our reality in that age. The Chronicles of the Indies left us countless others. Eldorado, our so avidly sought and illusory land, appeared on numerous maps for many a long year, shifting

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Development of New Gold Catalysts for Removing CO from H₂

Cited by 4 publications

References 149 publications

Recent Advances in Design of Gold-Based Catalysts for H2 Clean-Up Reactions

Recent Advances in Design of Gold-Based Catalysts for H2 Clean-Up Reactions

Plasmonic-Assisted Water–Gas Shift Reaction of Gold Particles on TiO2

CeOx-ZrO2 porous nanorods decorated with Au nanoparticles for the catalysis of preferential oxidation of carbon monoxide (PrOX-CO)

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Development of New Gold Catalysts for Removing CO from H2

Cited by 4 publications

References 149 publications

Recent Advances in Design of Gold-Based Catalysts for H2 Clean-Up Reactions

Recent Advances in Design of Gold-Based Catalysts for H2 Clean-Up Reactions

Plasmonic-Assisted Water–Gas Shift Reaction of Gold Particles on TiO2

CeOx-ZrO2 porous nanorods decorated with Au nanoparticles for the catalysis of preferential oxidation of carbon monoxide (PrOX-CO)

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Development of New Gold Catalysts for Removing CO from H₂