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题名: Gold catalysts supported on the mesoporous nanoparticles composited of zirconia and silicate for oxidation of formaldehyde
作者: Zhang, Yanbing3;  Shen, Yuenian3;  Yang, Xuzhuang3;  Sheng, Shishan2;  Wang, Tana3;  Adebajo, Moses F.1;  Zhu, Huaiyong1
关键词: Gold catalyst ;  Mesoporous support ;  Formaldehyde oxidation ;  Adsorption ;  Nanoparticle
刊名: JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
发表日期: 2010-02-01
DOI: 10.1016/j.molcata.2009.10.006
卷: 316, 期:1-2, 页:100-105
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Gold was loaded onto porous nanocomposite of ZrO(2) and silicate by deposition-precipitation. The resulting Au/ZrO(2)-nanocomposites are found to be superior catalysts for removal of formaldehyde from indoor air at moderate temperature by oxidation. They have large specific surface areas and allow the gold to be adequately dispersed as small nanoparticles (NPs). According to the analysis of transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), in the as-prepared catalyst, gold was well dispersed and in an oxidized state of Au(3+); and it was reduced to metallic crystals (Au(0)) during its use as catalyst. The temperature programmed desorption (TPD) results show that gold species in the two states strongly adsorb HCHO molecules at ambient temperature. The adsorbed HCHO molecules convert rapidly into formate species, as observed by the infrared spectra. The temperature programmed surface reaction (TPSR) study reveals that at temperatures below 450 K, the HCHO oxidation involves reaction between adsorbed formate species and adsorbed oxygen molecules. This explains why the gold species in both states are the active sites for HCHO oxidation, and also indicates that HCHO adsorption on the gold species and oxygen adsorption on the support are crucial steps for the oxidation. (C) 2009 Elsevier B.V. All rights reserved.
关键词[WOS]: VOLATILE ORGANIC-COMPOUNDS ;  TEMPERATURE CO OXIDATION ;  GOLD/IRON-OXIDE CATALYSTS ;  CARBON-MONOXIDE ;  AU CATALYSTS ;  SELECTIVE OXIDATION ;  COMBUSTION ;  METHANOL ;  IRON
语种: 英语
WOS记录号: WOS:000273890300014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141758
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Queensland Univ Technol, Sch Phys & Chem Sci, Brisbane, Qld 4001, Australia
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
3.Inner Mongolia Univ, Coll Chem & Chem Engn, Hohhot 010021, Peoples R China

Recommended Citation:
Zhang, Yanbing,Shen, Yuenian,Yang, Xuzhuang,et al. Gold catalysts supported on the mesoporous nanoparticles composited of zirconia and silicate for oxidation of formaldehyde[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,2010,316(1-2):100-105.
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