Gold stabilized aqueous sols immobilized on mesoporous CeO2–Al2O3 as catalysts for the preferential oxidation of carbon monoxide

Storaro, Loretta; Lenarda, Maurizio; Moretti, Elisa; Talon, Aldo; Porta, Francesca; Moltrasio, Bernardo; Canton, Patrizia

doi:10.1016/j.jcis.2010.06.062

Cited by 13 publications

(5 citation statements)

References 62 publications

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“…Among nanocomposite materials, CeO 2 shows a beneficial effect when added to Au/Al 2 O 3 , , Au/SiO 2 , Au/Co 3 O 4 , − and Au-TiO 2 . CeO 2 doped with many different cations has been tested for the PROX reaction, including Zr, Fe, − Zn, ,, Mn, , and RE (RE = La, Sm, Gd, and Y). ,, Also in the case of the PROX reaction, the preparation method of the CeO 2 -based support and the technique adopted for the deposition of Au nanoparticles strongly influence the catalytic activity.…”

Section: Applicationsmentioning

confidence: 99%

“…Rather than being related to the small gold particles obtained via SMAD, the highest activity was due to the strong interaction between ionic gold and ceria, which also enhanced the ceria surface oxygen reducibility. 478 Among nanocomposite materials, CeO 2 shows a beneficial effect when added to Au/Al 2 O 3 , 479,480 Au/SiO 2 , 481 Au/ Co 3 O 4 , 482−484 and Au-TiO 2 . 485 CeO 2 doped with many different cations has been tested for the PROX reaction, including Zr, 486 Fe, 486−490 Zn, 486,491,492 Mn, 487,493 and RE (RE = La, Sm, Gd, and Y).…”

Section: Chemical Reviewsmentioning

confidence: 99%

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Fundamentals and Catalytic Applications of CeO₂-Based Materials

et al. 2016

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Cerium dioxide (CeO2, ceria) is becoming an ubiquitous constituent in catalytic systems for a variety of applications. 2016 sees the 40(th) anniversary since ceria was first employed by Ford Motor Company as an oxygen storage component in car converters, to become in the years since its inception an irreplaceable component in three-way catalysts (TWCs). Apart from this well-established use, ceria is looming as a catalyst component for a wide range of catalytic applications. For some of these, such as fuel cells, CeO2-based materials have almost reached the market stage, while for some other catalytic reactions, such as reforming processes, photocatalysis, water-gas shift reaction, thermochemical water splitting, and organic reactions, ceria is emerging as a unique material, holding great promise for future market breakthroughs. While much knowledge about the fundamental characteristics of CeO2-based materials has already been acquired, new characterization techniques and powerful theoretical methods are deepening our understanding of these materials, helping us to predict their behavior and application potential. This review has a wide view on all those aspects related to ceria which promise to produce an important impact on our life, encompassing fundamental knowledge of CeO2 and its properties, characterization toolbox, emerging features, theoretical studies, and all the catalytic applications, organized by their degree of establishment on the market.

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Section: Applicationsmentioning

confidence: 99%

Section: Chemical Reviewsmentioning

confidence: 99%

Fundamentals and Catalytic Applications of CeO₂-Based Materials

et al. 2016

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“…Storaro et al have prepared mesoporous alumina–ceria (20 wt.% CeO 2 ) of high surface area and uniform pore size distribution by a one-pot procedure and dispersed gold sols on it. The latter were obtained upon reduction of HAuCl 4 by either bis[tetrakis-(hydroxymethyl)phosphonium sulfate] (THPS) or NaBH 4 (Storaro et al, 2010). It has been observed that THPS can reduce and stabilize highly dispersed gold particles.…”

Section: Well-performing Gold Catalysts For Additional Hydrogen Cleanmentioning

confidence: 99%

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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“…40 This can reduce the catalytic efficiency of the catalysts. To overcome this disadvantage, Au NPs are oen immobilized onto solid supports with mesopores, including SBA-15, [41][42][43] Al 2 O 3 , [44][45][46] MCM-41, 47,48 and SBA-16. 49 When using one of these Ausupported catalysts, the small Au NPs become dispersed mainly on the large, internal surfaces and pores of the support.…”

Section: Introductionmentioning

confidence: 99%