Morphology effects of nanoscale ceria on the activity of Au/CeO2 catalysts for low-temperature CO oxidation

Huang, Xinfang; Sun, Hao; Wang, Lu‐Cun; Liu, Yongmei; Fan, Kangnian; Cao, Yong

doi:10.1016/j.apcatb.2009.03.015

Cited by 278 publications

(113 citation statements)

References 66 publications

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“…The nanostructured ceria supports were not active in CO oxidation at temperatures below 373 K. In line with previous reports [25][26][27] the turnover frequencies (TOF) follow the trend Au/ CeO 2 (rod) [ Au/CeO 2 (rod)-CN [ Au/CeO 2 (cube). The leached counterpart of Au/CeO 2 (cube) does not show any activity.…”

Section: Resultssupporting

confidence: 72%

“…Several authors [25][26][27][28] have used nanostructured ceria that expose certain planes to investigate the influence of the nature of the ceria surface on the nature and activity of gold species. By judicious choice of the hydrothermal treatment conditions of hydrolyzed cerium(III) salts, singlecrystalline nanopolyhedra, nanorods and nanocubes were obtained [29,30].…”

Section: Introductionmentioning

confidence: 99%

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Gold Stabilized by Nanostructured Ceria Supports: Nature of the Active Sites and Catalytic Performance

et al. 2011

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The interaction of gold atoms with CeO 2 nanocrystals having rod and cube shapes has been examined by cyanide leaching, TEM, TPR, CO IR and X-ray absorption spectroscopy. After deposition-precipitation and calcination of gold, these surfaces contain gold nanoparticles in the range 2-6 nm. For the ceria nanorods, a substantial amount of gold is present as cations that replace Ce ions in the surface as follows from their first and second coordination shells of oxygen and cerium by EXAFS analysis. These cations are stable against cyanide leaching in contrast to gold nanoparticles. Upon reduction the isolated Au atoms form finely dispersed metal clusters with a high activity in CO oxidation, the WGS reaction and 1,3-butadiene hydrogenation. By analogy with the very low activity of reduced gold nanoparticles on ceria nanocubes exposing the {100} surface plane, it is inferred that the gold nanoparticles on the ceria nanorod surface also have a low activity in such reactions. Although the finely dispersed Au clusters are thermally stable up to quite high temperature in line with earlier findings (Y. Guan and E. J. M. Hensen, Phys Chem Chem Phys 11:9578, 2009), the presence of gold nanoparticles results in their more facile agglomeration, especially in the presence of water (e.g., WGS conditions). For liquid phase alcohol oxidation, metallic gold nanoparticles are the active sites. In the absence of a base, the O-H bond cleavage appears to be rate limiting, while this shifts to C-H bond activation after addition of NaOH. In the latter case, the gold nanoparticles on the surface of ceria nanocubes are much more active than those on the surface of nanorod ceria.

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Section: Resultssupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Gold Stabilized by Nanostructured Ceria Supports: Nature of the Active Sites and Catalytic Performance

et al. 2011

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“…Subsequently, Yuan and co-workers found that the activity in the preferential CO oxidation in H 2 -rich gas followed the same trend mentioned above [112,114]. Cao and co-workers demonstrated that the activity of Au/CeO 2 nanorods in CO oxidation was much higher than that of Au/CeO 2 nanoparticles [113]. Li and co-workers synthesized spindle-shaped Fe 2 O 3 nanoparticles using acidic amino acid additives, and they also prepared rhombohedral Fe 2 O 3 nanoparticles using basic amino acids [108].…”

Section: Effect Of the Particle Morphology Of The Supportmentioning

confidence: 66%

“…(2) can we find active gold catalysts based on previously overlooked supports (e.g., metal phosphates)? In addition, the effects of the crystal phase [65,82,[96][97][98][99][100], size [99,[101][102][103][104][105][106][107][108], and shape [45,[108][109][110][111][112][113][114] of solid supports on the catalytic performance are also of interest. Below we first present the development of Au/SiO 2 and Au/metal phosphate catalysts in our group, and then highlight recent findings on the effects of the particle size and shape of solid supports.…”

Section: General Considerationsmentioning

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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“…Co 3 O 4 , a typical spinel-structure transition metal oxide, has attracted considerable attention for CO oxidation, and is regarded as an alternative to gold catalysts [7][8][9][10]. In 2008, our group [11] developed a hydrothermal method using cobalt hydroxide as a precursor and subsequent direct thermal decomposition to obtain Co 3 O 4 nanobelts with exposed {011} planes, nanosheets with exposed {112} planes, and nanocubes with exposed {001} planes.…”

Section: Introductionmentioning

confidence: 99%

Surface active sites on Co3O4 nanobelt and nanocube model catalysts for CO oxidation

et al. 2010

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CO oxidation has been performed on Co 3 O 4 nanobelts and nanocubes as model catalysts. The Co 3 O 4 nanobelts which have a predominance of exposed {011} planes are more active than Co 3 O 4 nanocubes with exposed {001} planes. Temperature programmed reduction of CO shows that Co 3 O 4 nanobelts have stronger reducing properties than Co 3 O 4 nanocubes. The essence of shape and crystal plane effect is revealed by the fact that turnover frequency of Co 3+ sites of {011} planes on Co 3 O 4 nanobelts is far higher than that of {001} planes on Co 3 O 4 nanocubes.

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Morphology effects of nanoscale ceria on the activity of Au/CeO2 catalysts for low-temperature CO oxidation

Cited by 278 publications

References 66 publications

Gold Stabilized by Nanostructured Ceria Supports: Nature of the Active Sites and Catalytic Performance

Gold Stabilized by Nanostructured Ceria Supports: Nature of the Active Sites and Catalytic Performance

Development of novel supported gold catalysts: A materials perspective

Surface active sites on Co3O4 nanobelt and nanocube model catalysts for CO oxidation

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