Highly efficient Au/ZrO2 catalysts for low-temperature water–gas shift reaction: Effect of pre-calcination temperature of ZrO2

Zhang, Yanjie; Zhan, Yingying; Chen, Chongqi; Cao, Yanning; Lin, Xingyi; Zheng, Qi

doi:10.1016/j.ijhydene.2012.06.025

Cited by 40 publications

(17 citation statements)

References 35 publications

(32 reference statements)

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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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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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“…It is also known that oxide-supported noble metals (Pt, Au, etc.) are also able to catalyse the LT-WGS reaction [12][13][14][15][16][17][18], for which better catalysts are required.…”

Section: Introductionmentioning

confidence: 99%

“…Fe2O3, TiO2, ZnO, Zr2O, CeO2) have been described as supports for gold-based catalysts [14][15][16][17][18][23][24][25]. The increase in activity when gold is added to these oxides in LT-WGS was explained as a synergetic effect between gold and the metal oxide [24][25][26].…”

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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“…TheH 2 -TPR profile of bare FAUzeoliteshowedno peaks over the entire temperature range.Z r/FAU-p exhibited one reduction peak at approximately 480 8C, which is associated with the surface reductiono fZ r 4+ + to Zr 3+ + . [33][34][35] For Au/FAU-p,t he reduction peak was observed at 180 8C, which corresponds to the reduction of Au 3+ + to Au 0 . [36,37] ForA u-Zr/ FAU-p,t wo main peaks that correspond to the reductiono f cationic Au speciest om etal at low temperature and that of Zr 4+ + to Zr 3+ + at high temperature were observed in the TPR profile.…”

Section: Structural and Morphological Characterization Of Membranesmentioning

confidence: 97%

Hollow‐Fiber‐Supported Gold and Zirconium‐Doped Faujasite Catalytic Membranes for Hydrogen Purification

et al. 2017

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Hollow‐fiber‐supported Au‐Zr/faujasite (FAU, NaY) catalytic membranes were prepared and used as a flow‐through catalytic membrane reactor for CO preferential oxidation (CO‐PROX) in H2‐rich gas. The catalytic membranes were prepared by the modification of FAU zeolite membranes with Zr4+ and Au3+ by ion‐exchange, then activation. The obtained catalytic membranes were characterized by using TEM, X‐ray photoelectron spectroscopy, temperature‐programmed reduction, and temperature‐programmed desorption and their catalytic activity toward CO‐PROX was tested. The results showed that the activation conditions affected the size and oxidation states of the resulting Au nanoparticles strongly, and therefore, affected the catalytic activity strongly. The catalytic activity of the Au nanoparticles can be improved by the doping of Zr to form surface oxygen vacancies and the synergetic effect of Au‐Zr. Meanwhile, the presence of the zeolite framework allows the stabilization of small Au nanoparticles. The Au‐Zr/FAU catalytic membrane prepared under the optimized conditions showed a high catalytic performance (CO conversion above 95 %, turnover frequency>0.4 s−1) and outstanding stability (up to 450 h) below 80 °C, which made it a promising candidate for H2 purification.

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Highly efficient Au/ZrO2 catalysts for low-temperature water–gas shift reaction: Effect of pre-calcination temperature of ZrO2

Cited by 40 publications

References 35 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

Hollow‐Fiber‐Supported Gold and Zirconium‐Doped Faujasite Catalytic Membranes for Hydrogen Purification

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