Corrigendum to “Nature of the active site for CO oxidation on highly active Au/γ-Al2O3” [Appl. Catal. A: Gen. 232 (2002) 159–168]

Costello, C. K.; Kung, Mayfair C.; Wang, Y.; Kung, Harold H.

doi:10.1016/j.apcata.2003.10.007

Cited by 67 publications

(117 citation statements)

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“…This is different from our results. Our results supported the hypothesis suggested by Bond and Thompson [20], and Kung and co-workers [21] that an active catalyst contained both gold atoms and ions, and the initial activity depended on the ratio of both phases.…”

Section: Catalyst Structure Characterizationssupporting

confidence: 81%

Influence of pretreatment conditions on low-temperature CO oxidation over Au/MOx/Al2O3 catalysts

Wang

Hao

Cheng³

et al. 2003

Journal of Molecular Catalysis A: Chemical

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Composite oxide MO x /Al 2 O 3 supported gold catalysts for low-temperature CO oxidation were prepared and investigated. The presence of transition metal oxide was proved to be beneficial to the improvement of catalytic performance of Au/Al 2 O 3 catalysts for low-temperature CO oxidation. Furthermore, the influence of various pretreatment conditions on Au/MO x /Al 2 O 3 catalysts was studied carefully. The image of TEM showed that gold catalyst with small gold particles only in the form of a fine dispersion exhibited highly catalytic activity. The XPS, Fourier transform infrared (FTIR) spectroscopy characterization results of Au/FeO x /Al 2 O 3 catalyst showed that gold catalysts having partially oxidized gold species have the best catalytic performance. One possible pathway for CO oxidation on Au/FeO x /Al 2 O 3 catalyst is that the CO adsorbed on gold particles reacts with adsorbed oxygen, which is possible to occur on oxygen vacancies on the support or at the metal-support interface.

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Section: Catalyst Structure Characterizationssupporting

confidence: 81%

Influence of pretreatment conditions on low-temperature CO oxidation over Au/MOx/Al2O3 catalysts

Wang

Hao

Cheng³

et al. 2003

Journal of Molecular Catalysis A: Chemical

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“…The loss of hydroxyl groups in the used catalysts is consistent with a mechanism [23,24], which is based on the active site model mentioned above. According to this mechanism, CO adsorbed on metallic Au is inserted into an Au-OH bond to form a hydroxycarbonyl (CO  OH   OCOH  ).…”

Section:  Ohmentioning

confidence: 68%

“…Deactivation of the catalyst was suggested to occur due to reduction of oxidized gold species (which were claimed to be the most active sites for CO oxidation) to metallic gold [3,4], sintering of Au nanoparticles (irreversible) [6,15,18], dehydroxylation of the support during the reaction (assuming that OH groups were involved in the oxidation pathway) [23,24], and accumulation of carbonate-like species (carbonate  2 3 CO , formate  2 HCO and carboxylate O-CO groups) at the active sites [6,9,19,25,27,28]. In our work, some sintering, dehydroxylation and build-up of surface carbonate-like species occurred in the catalyst (DP1) already after 1 h on stream, although no deactivation was observed ( Fig.…”

Section:  Ohmentioning

confidence: 99%

“…The important role of surface hydroxyls in the enhancement of activity of the Au/TiO 2 catalyst was assigned [22] to a significant charge transfer at the interface of the Au nanoparticle and TiO 2 that resulted in reducing the CO oxidation reaction barrier. The hydroxyl group adsorbed on the support and bonded to an Au cation or to a highly coordinatively unsaturated metallic Au atom at the periphery of Au nanoparticle was also considered [1, 23,24] to be a part of the active site involved in CO oxidation.…”

Section:  Ohmentioning

confidence: 99%

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XPS/ToF-SIMS Characterization of TiO$_{2}$ Supported Au Nanoparticles: Effect of Catalytic CO Oxidation

Chenakin¹,

Kruse²,

Vasylyev³

et al. 2016

Metallofiz. Noveishie Tekhnol.

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X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) are employed for a comparative study of the surface composition and electronic structure of an Au/TiO 2 catalyst in the asprepared state and after using it in the reaction of CO oxidation at room temperature. As found, the reaction-induced changes in the morphology of Au nanoparticles related to their agglomeration are accompanied by modification of the electronic state of the catalyst via an enhanced electron transfer to the gold atoms that shows up as an additional negative shift of the Au 4f spectrum and its distortion. The catalytic reaction of CO oxidation results in the loss of hydroxyl groups and accumulation on the support surface of various carbon-containing species with the leading formation of carbonate and bicarbonate groups, which increases with time on stream. The role of these factors in deactivation of the catalyst is discussed.За допомогою рентґенівської фотоелектронної спектроскопії (РФЕС) та часопролітної вторинно-іонної мас-спектрометрії (ЧП-ВІМС) проведено порівняльне дослідження складу поверхні й електронної структури ката-лізатора Au/TiO 2 у свіжоприготованому стані та після його використання у реакції окиснення CO за кімнатної температури. Встановлено, що інду-ковані каталітичною реакцією зміни у морфології наночастинок Au, які спричинені їхньою аґломерацією, супроводжувалися модифікуванням електронного стану каталізатора завдяки посиленому перенесенню елек-тронів на атоми золота, що проявлялося як додатковий неґативний зсув РФЕ-спектра Au 4f і його спотворення. Каталітична реакція окиснення CO призводила до втрати гідроксильних груп та накопичення на поверхні підкладки різних вуглецевмісних функціональних груп з переважним С помощью рентгеновской фотоэлектронной спектроскопии (РФЭС) и времяпролётной вторично-ионной масс-спектрометрии (ВП-ВИМС) про-ведено сравнительное исследование состава поверхности и электронной структуры катализатора Au/TiO 2 в свежеприготовленном состоянии и по-сле его использования в реакции окисления CO при комнатной темпера-туре. Установлено, что индуцированные каталитической реакцией изме-нения в морфологии наночастиц Au, вызванные их агломерацией, сопро-вождались модификацией электронного состояния катализатора путём усиленного переноса электронов на атомы золота, что проявлялось в виде дополнительного отрицательного сдвига РФЭ-спектра Au 4f и его иска-жения. Каталитическая реакция окисления CO приводила к потере гид-роксильных групп и накоплению на поверхности подложки различных углеродсодержащих функциональных групп с преимущественным фор-мированием карбонатов и бикарбонатов, которое усиливалось с течением времени реакции. Обсуждается роль этих факторов в деактивации ката-лизатора.

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“…10 Another cause of 20 deactivation is the formation of poisoning carbonate-type surface species. 11,12 Most approaches aiming at producing more stable gold catalysts 13 have focused so far on enhancing the thermal stability of gold nanoparticles against sintering 14 by increasing the so- 25 called "strength of gold-support interaction", in e.g. Au/Al 2 O 3 , 15,16 Au/metal-phosphates, 17 core-shell and yolk-shell nanocomposites, 18 Au/multi-layered oxides 19 and SiO 2 -modified Au/TiO 2 catalysts.…”

Section: Nm Gold Nanoparticles Obtained By Direct Chemical Reduction mentioning

confidence: 99%

Durable PROX catalyst based on gold nanoparticles and hydrophobic silica

et al. 2016

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Corrigendum to “Nature of the active site for CO oxidation on highly active Au/γ-Al2O3” [Appl. Catal. A: Gen. 232 (2002) 159–168]

Cited by 67 publications

References 0 publications

Influence of pretreatment conditions on low-temperature CO oxidation over Au/MOx/Al2O3 catalysts

Influence of pretreatment conditions on low-temperature CO oxidation over Au/MOx/Al2O3 catalysts

XPS/ToF-SIMS Characterization of TiO$_{2}$ Supported Au Nanoparticles: Effect of Catalytic CO Oxidation

Durable PROX catalyst based on gold nanoparticles and hydrophobic silica

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