Performance of Au/M x Oy/TiO2 Catalysts in Water-Gas Shift Reaction

Ma, Zhen; Yin, Hongfeng; Dai, Sheng

doi:10.1007/s10562-009-0201-y

Cited by 31 publications

(25 citation statements)

References 74 publications

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“…As shown in Fig. 7, Au/TiO 2 collected after pretreatment at 500 °C and subsequent use in the water-gas shift reaction contained mostly large gold particles, whereas Au/ZnO/TiO 2 retained small gold nanoparticles after pretreatment at 500 °C [92]. Although we ascribed the difference in catalytic activity to the size of the gold nanoparticles in our publications [78,92], we now believe that different metal oxide additives may also have different redox properties, and may even change the oxidation states of gold and create new active sites.…”

Section: Pre-modification Of Tio 2 Supportsmentioning

confidence: 93%

“…7, Au/TiO 2 collected after pretreatment at 500 °C and subsequent use in the water-gas shift reaction contained mostly large gold particles, whereas Au/ZnO/TiO 2 retained small gold nanoparticles after pretreatment at 500 °C [92]. Although we ascribed the difference in catalytic activity to the size of the gold nanoparticles in our publications [78,92], we now believe that different metal oxide additives may also have different redox properties, and may even change the oxidation states of gold and create new active sites. The pre-modification strategy has also been used by others to prepare TiO 2 -based gold catalysts, such as Au/MgO/TiO 2 [177], Au/MnO 2 /TiO 2 [178], Figure 7 Dark-field TEM images of Au/TiO 2 and Au/ZnO/TiO 2 catalysts collected after pretreatment at 500 °C followed by use in the water-gas shift reaction.…”

Section: Pre-modification Of Tio 2 Supportsmentioning

confidence: 98%

“…Reproduced by permission of Springer from Ref. [92] Au/FeO x /TiO 2 [179,180], Au/CuOx/TiO 2 [181], Au/ZnO/ TiO 2 [182], and Au/CeO x /TiO 2 [183,184]. However, the local interfacial structures were often not characterized sufficiently.…”

Section: Pre-modification Of Tio 2 Supportsmentioning

confidence: 99%

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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 Tio 2 Supportsmentioning

confidence: 93%

Section: Pre-modification Of Tio 2 Supportsmentioning

confidence: 98%

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Development of novel supported gold catalysts: A materials perspective

2010

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“…To develop new and more efficient WGS catalysts, supported catalysts have been believed to be good candidate. For example, both precious metals (e.g., Pt, Au, Pd, Rh, Ir or Ru) [2,3] and cheap transition metals (e.g., Cu or Ni) [4,5] were deposited on various supports including TiO 2 [6][7][8][9][10][11][12][13][14][15][16][17], CeO 2 [18][19][20][21][22][23], Mo 2 C [24][25][26], FeO x [27][28][29], Co 3 O 4 [30], Al 2 O 3 [31,32], ZrO 2 [33,34], CeO 2 -TiO 2 [35], CeO 2 -ZrO 2 [36,37] and CeO 2 -La 2 O 3 [38]. Au-TiO 2 catalysts have been given considerable attentions for WGS activities, due to the high activity and low side reactions of dispersed Au [38], and some advantages of TiO 2 supports (e.g., low price, easy preparation, adjustable properties and strong interaction with active metal).…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-Etched TiO2−x as Efficient Support of Gold Catalysts for Water–Gas Shift Reaction

Song

Zhang

et al. 2018

Catalysts

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Hydrogen-etching technology was used to prepare TiO 2−x nanoribbons with abundant stable surface oxygen vacancies. Compared with traditional Au-TiO 2 , gold supported on hydrogen-etched TiO 2−x nanoribbons had been proven to be efficient and stable water-gas shift (WGS) catalysts. The disorder layer and abundant stable surface oxygen vacancies of hydrogen-etched TiO 2−x nanoribbons lead to higher microstrain and more metallic Au 0 species, respectively, which all facilitate the improvement of WGS catalytic activities. Furthermore, we successfully correlated the WGS thermocatalytic activities with their optoelectronic properties, and then tried to understand WGS pathways from the view of electron flow process. Hereinto, the narrowed forbidden band gap leads to the decreased Ohmic barrier, which enhances the transmission efficiency of "hot-electron flow". Meanwhile, the abundant surface oxygen vacancies are considered as electron traps, thus promoting the flow of "hot-electron" and reduction reaction of H 2 O. As a result, the WGS catalytic activity was enhanced. The concept involved hydrogen-etching technology leading to abundant surface oxygen vacancies can be attempted on other supported catalysts for WGS reaction or other thermocatalytic reactions.

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“…56 Interestingly, although some gold catalysts based on metal phosphate supports (most of these supports are non-reducible) were active for CO oxidation, [57][58][59][60] none of them were active in WGSR. 61 One possible reason is that WGSR takes place at much higher temperatures than CO oxidation on gold catalysts. Another reason may be that the site requirements and/or mechanisms for these two reactions are different.…”

Section: Introductionmentioning

confidence: 99%

Water–gas shift on gold catalysts: catalyst systems and fundamental studies

Tao¹,

Ma²

2013

Phys. Chem. Chem. Phys.

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Since the pioneering finding by Haruta et al. that small gold nanoparticles on reducible supports can be highly active for low-temperature CO oxidation, the synthesis, characterization, and application of supported gold catalysts have attracted much attention. The water-gas shift reaction (WGSR: CO + H 2 O = CO 2 + H 2 ) is important for removing CO and upgrading the purity of H 2 for fuel cell applications, ammonia synthesis, and selective hydrogenation processes. In recent years, much attention has been paid to exploration the possibility of using supported gold nanocatalysts for WGSR and understanding the fundamental aspects related to catalyst deactivation mechanisms, nature of active sites, and reaction mechanisms. Here we summarize recent advances in the development of supported gold catalysts for this reaction and fundamental insights that can be gained, and furnish our assessment on the status of research progress.

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Performance of Au/M x Oy/TiO2 Catalysts in Water-Gas Shift Reaction

Cited by 31 publications

References 74 publications

Development of novel supported gold catalysts: A materials perspective

Development of novel supported gold catalysts: A materials perspective

Hydrogen-Etched TiO2−x as Efficient Support of Gold Catalysts for Water–Gas Shift Reaction

Water–gas shift on gold catalysts: catalyst systems and fundamental studies

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