The effect of reaction conditions on the stability of Au/CeZrO4 catalysts in the low-temperature water–gas shift reaction

Daly, Helen; Goguet, Alexandre; Hardacre, Christopher; Meunier, Frédéric; Pilasombat, R.; Thompsett, David

doi:10.1016/j.jcat.2010.05.021

Cited by 58 publications

(61 citation statements)

References 45 publications

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“…Figure 1c shows high-temperature stabilities of the Au-TiO 2 catalysts for WGS at 600 • C. The CO conversion of Au-TiO 2−x -N catalyst only decrease by 19.1% (from 86% to 69.6%) over a 32-h run, which obviously presents higher stability than Au-TiO 2 -N catalyst (decrease by 36.8% from 85.5% to 54.7%). Meanwhile, our Au-TiO 2−x -N catalyst has a comparable or even higher stability than the Au-TiO 2 and Au/CeZrO 4 catalysts reported in the literature [14,37].…”

Section: Structural Propertiesmentioning

confidence: 51%

“…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%

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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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Section: Structural Propertiesmentioning

confidence: 51%

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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“…Deposition-precipitation (DP) and co-precipitation (CP) are the most common methods used for the synthesis of Au-based catalysts for LT-WGS reaction [20,24,25,[29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Effect of the preparation method on the catalytic activity and stability of Au/Fe2O3 catalysts in the low-temperature water–gas shift reaction

Soria

Pérez

Carabineiro

et al. 2014

Applied Catalysis A: General

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The low temperature water-gas-shift reaction has been studied over a series of nanosized Au/Fe2O3 catalysts. The effect of the synthesis method on the catalytic activity has been analysed. A series of catalysts with different Au loadings has been prepared by different methods: Deposition-Precipitation (DP), Liquid Phase Reductive Deposition (LPRD) and Double Impregnation Method (DIM). The Au/Fe2O3 catalysts prepared by DP showed the highest CO conversion. The catalysts were characterised by hydrogen temperature programmed reduction (TPR-H2), high-resolution transmission electron microscopy (HRTEM), X-ray powder diffraction and X-ray photoelectron spectroscopy. TPR-H2 analysis revealed that gold promotes the reducibility of the Fe2O3 support, which is crucial in this redox reaction. HRTEM evidences a very good dispersion of gold over the iron support, with nanoparticles in the range 2.2-3.1 nm for the DP and LPRD series, and a negligible increase in the average particle size of the used samples. For the DIM series, much larger Au particles (~6.6 nm) were obtained.

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“…Because of the high activity of this relatively new family of gold catalysts for reactions like LT-WGS (low temperature-water gas shift) [17][18][19][20][21][22], oxidation of CO [23][24][25][26] and volatile organic compounds (VOCs) [27], or PROX (selective oxidation of CO in presence of an excess of H 2 ) [28], the interest on them is rapidly growing. However, none of the studies mentioned above have dealt with Au/CeO 2 -ZrO 2 samples prepared by the homogeneous deposition-precipitation method with urea followed herein.…”

Section: Introductionmentioning

confidence: 99%

CO Oxidation Activity of a Au/Ceria-Zirconia Catalyst Prepared by Deposition–Precipitation with Urea

et al. 2011

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The activation of a 2.6 wt% Au/Ce 0.62 Zr 0.38 O 2 catalyst prepared by deposition-precipitation with urea is investigated. At 298 K, the activity for CO oxidation of the as-prepared sample is very low; it is significantly increased when heated at 418 K, under the reaction mixture, and much strongly when pre-treated under flowing O 2 (5%)/He, at 523 K. As revealed by XPS, FTIRS, HAADF-STEM, and HRTEM studies, the activation process consists of the transformation of the initial urea-containing Au(III) precursor deposited on the support into a highly dispersed metal phase (Au nano-particle mean size: 1.8 nm).

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The effect of reaction conditions on the stability of Au/CeZrO4 catalysts in the low-temperature water–gas shift reaction

Cited by 58 publications

References 45 publications

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

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

Effect of the preparation method on the catalytic activity and stability of Au/Fe2O3 catalysts in the low-temperature water–gas shift reaction

CO Oxidation Activity of a Au/Ceria-Zirconia Catalyst Prepared by Deposition–Precipitation with Urea

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