The Potential for Use of Gold in Automotive Pollution Control Technologies: A Short Review

Pattrick, Gary; Lingen, Elma van der; Corti, Christopher W.; Holliday, Richard; Thompson, David

doi:10.1023/b:toca.0000029762.14168.d8

Cited by 107 publications

(80 citation statements)

References 38 publications

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“…On the other hand, Au/TiO 2 is highly active for CO oxidation, but it suffers from significant loss of activity upon high-temperature calcination [6][7][8][9][10]. The latter situation may adversely influence the practical applications of Au/ TiO 2 when the operation and regeneration of catalysts at elevated temperature are needed [11,12].…”

Section: Introductionmentioning

confidence: 98%

Rational design of gold catalysts with enhanced thermal stability: post modification of Au/TiO2 by amorphous SiO2 decoration

Zhu

Overbury

et al. 2007

Catal Lett

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Au/TiO 2 is highly active for CO oxidation, but it often suffers from sintering in high-temperature environments. In this work, we report on a novel design of gold catalysts, in which pre-formed Au/TiO 2 catalysts were post decorated by amorphous SiO 2 to suppress the agglomeration of gold particles. Even after being aged in O 2 -He at 700°C, the SiO 2 -decorated Au/TiO 2 was still active for CO oxidation at ambient temperature.

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Section: Introductionmentioning

confidence: 98%

Rational design of gold catalysts with enhanced thermal stability: post modification of Au/TiO2 by amorphous SiO2 decoration

Zhu

Overbury

et al. 2007

Catal Lett

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“…[1][2][3][4][5][6][7] Gold-based catalysts have potential applications in automotive emission control, because unlike platinum or palladium catalysts, they remain active at low temperatures (room temperature). [8] While various support materials, particle synthesis routes, and deposition techniques have been investigated over the years, [9,10] the mechanisms responsible for the catalytic activity are still under debate, because of the complexity of the particle-support interactions and the reaction pathways.…”

mentioning

confidence: 99%

Gold Catalysts: Nanoporous Gold Foams

et al. 2006

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Despite the general inertness of gold, finely dispersed gold nanoparticles on suitable oxide supports can demonstrate remarkable catalytic activity for the epoxidation of propene or the oxidation of CO, for example. [1][2][3][4][5][6][7] Gold-based catalysts have potential applications in automotive emission control, because unlike platinum or palladium catalysts, they remain active at low temperatures (room temperature).[8] While various support materials, particle synthesis routes, and deposition techniques have been investigated over the years, [9,10] the mechanisms responsible for the catalytic activity are still under debate, because of the complexity of the particle-support interactions and the reaction pathways.Research to date has shown that the particle size, type of support material, and particle-support contact structure play major roles. [6,11,12] In contrast to supported gold catalyst systems, unsupported systems, such as gold powder, have not yet drawn much attention, although remarkably high catalytic activity for CO oxidation has been attained with such systems. [13] Moreover, unsupported gold catalysts allow the relevant catalytic mechanisms to be more easily understood and also make new applications accessible. Herein, we demonstrate that high catalytic activity is not necessarily linked to the presence of finely dispersed particles. Nanoporous gold with a spongelike morphology, formed through the selective leaching of silver from a gold-silver alloy, [14][15][16] has an unexpectedly high catalytic activity for CO oxidation at ambient pressures and temperatures down to À20 8C. Sintering can hamper the catalytic applications of gold particles; in contrast, nanoporous gold has good thermal stability, and its morphology can be easily reproduced.The spongelike morphology of the nanoporous gold used herein consists of interconnecting ligaments with diameters[*] Dr.

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“…B. als Abgaskatalysatoren im Automobilbau, da sie anders als Pt oder Pd bereits bei niedrigen Temperaturen (Raumtemperatur) aktiv sind. [8] In den vergangenen Jahren wurden bereits verschiedenste Trägermaterialien, Partikelsynthesen und Abscheidungstechniken untersucht; [9,10] dennoch werden die für die katalytische Aktivität verantwortlichen Mechanismen bis heute kontrovers diskutiert. Gründe hierfür liegen in der Komplexität der Partikel-Träger-Wechselwirkungen und der mögli-chen Reaktionswege.…”

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