Control Reaction Path of CO Oxidation by Regulating the Oxidation State of Au Species

Wang, Fang; Lü, Gongxuan

doi:10.1007/s10562-009-0218-2

Cited by 9 publications

(5 citation statements)

References 31 publications

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“…Gold catalysts based on oxidemodified Al 2 O 3 supports include Au/MgO/Al 2 O 3 [189][190][191], Au/MnO x /Al 2 O 3 [192][193][194], Au/FeO x /Al 2 O 3 [192][193][194][195][196], Au/CoO x /Al 2 O 3 [192,194], Au/ZnO/Al 2 O 3 [192,197] [199], and Au/CeO 2 /Al 2 O 3 [200][201][202][203]. In particular, Nieuwenhuys and coworkers tested the performance of Al 2 O 3 -based gold catalysts in a number of reactions, and established that MgO/Al 2 O 3 [189], BaO/Al 2 O 3 [204,205], ZnO/Al 2 O 3 [197], and ZrO x /Al 2 O 3 [197] could all stabilize gold nanoparticles against thermal sintering.…”

Section: Pre-modification Of Al 2 O 3 Supportsmentioning

confidence: 99%

Development of novel supported gold catalysts: A materials perspective

2010

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Since Haruta et al. discovered that small gold nanoparticles finely dispersed on certain metal oxide supports can exhibit surprisingly high activity in CO oxidation below room temperature, heterogeneous catalysis by supported gold nanoparticles has attracted tremendous attention. The majority of publications deal with the preparation and characterization of conventional gold catalysts (e.g., Au/TiO 2 ), the use of gold catalysts in various catalytic reactions, as well as elucidation of the nature of the active sites and reaction mechanisms. In this overview, we highlight the development of novel supported gold catalysts from a materials perspective. Examples, mostly from those reported by our group, are given concerning the development of simple gold catalysts with single metal-support interfaces and heterostructured gold catalysts with complicated interfacial structures. Catalysts in the first category include active Au/SiO 2 and Au/metal phosphate catalysts, and those in the second category include catalysts prepared by pre-modification of supports before loading gold, by post-modification of supported gold catalysts, or by simultaneous dispersion of gold and an inorganic component onto a support. CO oxidation has generally been employed as a probe reaction to screen the activities of these catalysts. These novel gold catalysts not only provide possibilities for applied catalysis, but also furnish grounds for fundamental research.

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Section: Pre-modification Of Al 2 O 3 Supportsmentioning

confidence: 99%

Development of novel supported gold catalysts: A materials perspective

2010

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“…(B). The extracted Au 4f 7/2 BE (83.4 eV) is significantly lower than that reported for metallic Au (84.0 eV), suggesting electron transfer from the support to generate electron rich Au δ– , as has been proposed for Au on aluminium oxide (Al 2 O 3 ) …”

Section: Resultsmentioning

confidence: 61%

Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al₂O₃

Wang

Keane

2019

J of Chemical Tech & Biotech

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BACKGROUND Trace quantities of phenylacetylene can poison styrene polymerisation catalysts. The phenylacetylene content must be less than 10 ppm and selective hydrogenation (to styrene) is viewed as a viable process solution. High styrene selectivities have been achieved in batch liquid phase operations while a switch from conventional batch liquid to continuous gas phase reaction presents process advantages in terms of higher throughput and enhanced productivity. We aim to provide the first direct comparison of Au/Al2O3 and Pd/Al2O3 in gas phase continuous catalytic hydrogenation of phenylacetylene. RESULTS Temperature programme reduction (TPR) generated metal particles at the nano‐scale (mean size = 3.0–4.3 nm), with evidence of electron donation from the aluminium oxide (Al2O3) carrier. Pd/Al2O3 exhibited a greater specific hydrogen (H2) uptake capacity than Au/Al2O3 under reaction conditions to deliver appreciably higher turnover frequencies (TOF) for reaction in excess H2. Stepwise hydrogenation predominated over Au/Al2O3 with 100% selectivity to styrene at 353 K where an increase in temperature favoured subsequent hydrogenation to ethylbenzene. Under the same conditions, Pd/Al2O3 was non‐selective, activating styrene to generate ethylbenzene with a greater contribution of direct phenylacetylene hydrogenation to ethylbenzene at higher temperature. CONCLUSION Kinetic analysis has revealed stepwise phenylacetylene hydrogenation in excess H2 over Au/Al2O3 with 100% selectivity to styrene. Stepwise hydrogenation also prevailed over Pd/Al2O3 at the lower temperature but surface activation of styrene coupled with enhanced H2 dissociation generated significant ethylbenzene. Decreasing inlet H2/phenylacetylene (to 1 mol/mol) over Pd/Al2O3 lowered rate where the activity/selectivity profile overlapped that exhibited by Au/Al2O3 in excess H2. © 2019 Society of Chemical Industry

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Section: Discussionmentioning

confidence: 99%

“…5 Accordingly, the total activity of the real working catalyst may be contributed by many mechanisms and the reaction may proceed along many paths. 96,118 Also, the reaction mechanisms vary depending on the oxidation reaction. 7 The comparison of the CO oxidation performance between the Au/ceria-based catalysts studied in this work and the benchmark Pt/Al 2 O 3 shows the superiority of gold systems.…”

Section: The Surface Properties Of Catalystsmentioning

confidence: 99%

Confinement of nano-gold in 3D hierarchically structured gadolinium-doped ceria mesocrystal: synergistic effect of chemical composition and structural hierarchy in CO and propane oxidation

Woźniak

Małecka

Kraszkiewicz

et al. 2022

Catal. Sci. Technol.

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Control Reaction Path of CO Oxidation by Regulating the Oxidation State of Au Species

Abstract: Reaction path of CO oxidation in the presence and the absence of hydrogen can be well controlled by regulating the oxidation state of Au species via addition of appropriate dopant, which resulted in different product distribution.

Cited by 9 publications

References 31 publications

Development of novel supported gold catalysts: A materials perspective

Development of novel supported gold catalysts: A materials perspective

Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al₂O₃

Confinement of nano-gold in 3D hierarchically structured gadolinium-doped ceria mesocrystal: synergistic effect of chemical composition and structural hierarchy in CO and propane oxidation

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Control Reaction Path of CO Oxidation by Regulating the Oxidation State of Au Species

Abstract: Reaction path of CO oxidation in the presence and the absence of hydrogen can be well controlled by regulating the oxidation state of Au species via addition of appropriate dopant, which resulted in different product distribution.

Cited by 9 publications

References 31 publications

Development of novel supported gold catalysts: A materials perspective

Development of novel supported gold catalysts: A materials perspective

Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al2O3

Confinement of nano-gold in 3D hierarchically structured gadolinium-doped ceria mesocrystal: synergistic effect of chemical composition and structural hierarchy in CO and propane oxidation

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Gas phase selective hydrogenation of phenylacetylene to styrene over Au/Al₂O₃