The states of gold species in CeO2 supported gold catalyst for formaldehyde oxidation

Shen, Yuhua; Yang, Xin; Wang, Yizheng; Zhang, Yanbing; Zhu, Hua; Gao, Ling; Jia, Meilin

doi:10.1016/j.apcatb.2007.09.042

Cited by 155 publications

(52 citation statements)

References 26 publications

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“…After Pt loading, the OMS-2 catalyst showed a very strong and broad H 2 -consumption peak at a maximum of 190 • C, which was attributed to the reduction of PtO x and partial reduction of MnO 2 [28], and 100% conversion of formaldehyde could only be achieved at 120 • C in 500 ppm HCHO. It has also been found that the highly dispersed and poorly crystallized metallic gold and small amount of oxidized gold in the CeO 2 support catalysts exhibited superior activity for HCHO oxidation at temperatures close to 100 • C [14]. However Fe-O supported Au catalyst gave different gold active sites and activity [29].…”

Section: Introductionmentioning

confidence: 99%

“…Noble metal catalysts (Pt, Pd, Au etc.) possess high activity for the oxidation of HCHO at a low temperature [12,14,19]. However, these catalysts are uneconomical for wide application due to their high costs.…”

Section: Introductionmentioning

confidence: 99%

“…As we all know the catalytic oxidation is widely used in the chemical industry and environmental protection, and the conversion of VOCs into CO 2 and H 2 O using heterogeneous catalysts by catalytic oxidation at much lower temperature has proven to be an efficient and practical technology for controlling VOCs emission [5][6][7][8][9][10][11]. As a consequence, the formaldehyde catalytic oxidation has been studied over many catalysts [12][13][14][15][16][17][18]. Noble metal catalysts (Pt, Pd, Au etc.)…”

Section: Introductionmentioning

confidence: 99%

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Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde

et al. 2011

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde

et al. 2011

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“…Due to stringent environmental regulations for human health protection, low-temperature catalytic oxidation of formaldehyde (HCHO) to CO 2 and H 2 O has become an attractive research topic [1][2][3][4][5]. In the past decades, a variety of catalysts, including metal oxides [3,6], composite oxides [7], and supported noble metals [8] have been investigated for the HCHO emission control.…”

Section: Introductionmentioning

confidence: 99%

Highly active manganese oxide catalysts for low-temperature oxidation of formaldehyde

Tian¹,

He²,

Liu³

et al. 2012

Microporous and Mesoporous Materials

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a b s t r a c tBirnessite -type manganese oxides with very high surface areas (up to 154 m 2 /g) were successfully prepared using a microemulsion process. The morphology, surface area, pore size, and the surface reducibility of these materials were readily tailored via the synthesis temperature. The physiochemical properties of the manganese oxides were characterized by means of XRD, TEM, SEM, BET and H 2 -TPR techniques. These materials were also catalytically tested in HCHO oxidation, showing significantly high catalytic activity. It was found that the differences in catalytic performance of these materials were jointly attributed to the effects of the morphology, surface area and surface reducibility. The highly porous feature of the catalyst with nanospheres could allow HCHO molecules to easily diffuse onto catalytically active sites, which endows the nanospheres with high catalytic activity. The higher the surface area, the higher its catalytic activity. A higher surface reducibility offered a lower temperature of HCHO oxidation. The most active manganese catalyst (BSW-120) showed a 100% HCHO conversion at 100°C.

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“…4A). HCHO cannot be converted to CO 2 over Au/TiO 2 catalysts prepared by impregnation methods at 20°C (Zhang and He, 2007), and Fe 2 O 3 -and CeO 2 -supported Au catalysts can generally decompose HCHO into CO 2 only at temperatures at or above 60°C (Shen et al, 2008;Li et al, 2008a, b). Thus, the catalytic activity of the layered Au/TiO 2 -300 nanospheres was higher than that reported in previous studies and is indicative of the structural benefits of Au/TiO 2 for HCHO oxidation.…”

Section: Room-temperature Activity Of Formaldehyde Oxidationmentioning

confidence: 99%

Layered sphere-shaped TiO 2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

Pang

et al. 2016

Journal of Environmental Sciences

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We describe here a one-step method for the synthesis of Au/TiO 2 nanosphere materials, which were formed by layered deposition of multiple anatase TiO 2 nanosheets. The Au nanoparticles were stabilized by structural defects in each TiO 2 nanosheet, including crystal steps and edges, thereby fixing the Au-TiO 2 perimeter interface. Reactant transfer occurred along the gaps between these TiO 2 nanosheet layers and in contact with catalytically active sites at the Au-TiO 2 interface. The doped Au induced the formation of oxygen vacancies in the Au-TiO 2 interface. Such vacancies are essential for generating active oxygen species (*O − ) on the TiO 2 surface and Ti 3+ ions in bulk TiO 2 . These ions can then form Ti 3+ -O − -Ti 4+ species, which are known to enhance the catalytic activity of formaldehyde (HCHO) oxidation.These studies on structural and oxygen vacancy defects in Au/TiO 2 samples provide a theoretical foundation for the catalytic mechanism of HCHO oxidation on oxide-supported Au materials.

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The states of gold species in CeO2 supported gold catalyst for formaldehyde oxidation

Cited by 155 publications

References 26 publications

Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde

Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde

Highly active manganese oxide catalysts for low-temperature oxidation of formaldehyde

Layered sphere-shaped TiO 2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

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