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题名: Studies on the SbOx species of SbOx/SiO2 catalysts for methane-selective oxidation to formaldehyde
作者: Zhang, HD;  Sun, KQ;  Feng, ZC;  Ying, PL;  Li, C
通讯作者: 李灿
关键词: antimony oxide ;  species evolution ;  methane ;  selective oxidation ;  formaldehyde
刊名: APPLIED CATALYSIS A-GENERAL
发表日期: 2006-05-17
DOI: 10.1016/j.apeata.2006.02.038
卷: 305, 期:1, 页:110-119
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Life Sciences & Biomedicine
类目[WOS]: Chemistry, Physical ;  Environmental Sciences
研究领域[WOS]: Chemistry ;  Environmental Sciences & Ecology
英文摘要: Sb2O3/SiO2 and Sb2O5/SiO2 catalysts were prepared and characterized by N-2-adsorption, XRD, XPS, UV-vis DRS, UV Raman and H-2-TPR and investigated in methane-selective oxidation. No crystalline antimony oxide can be detected on catalysts even when antimony oxides loading reaches 20 wt.%. On Sb2O3/SiO2 catalysts, the oxidation of highly dispersed Sb3+ oxidic entities is more difficult than that of aggregated Sb3+ oxidic entities. The concentration of Sb5+ oxidic entities increases with Sb2O3 loading and about half the amount of Sb3+ oxidic entities can be oxidized to Sb5+ oxidic entities on 20 wt.% Sb2O3/SiO2 catalyst. On Sb2O5/SiO2 catalysts, SbOx species are all Sb5+ oxidic entities and aggregated SbOx species emerge as Sb2O5 loading reaches 5 wt.%. In methane-selective oxidation, highly dispersed SbOx species are more active than aggregated SbOx species and the depression of deep oxidation towards CO2 is more favorable on aggregated SbOx species than on highly dispersed SbOx species regardless of the oxidation state of Sb. Furthermore, highly dispersed Sb3+ oxidic entities are more active than highly dispersed Sb5+ oxidic entities. Such tendency is in line with that, for both Sb2O3/SiO2 and Sb2O5/SiO2 catalysts, the redox performance of aggregated SbOx species are poor compared to that of highly dispersed SbOx species. This results in their decreasing activity but increasing selectivity to CO and formaldehyde with increasing loading of antimony oxides in methane-selective oxidation. (c) 2006 Elsevier B.V. All rights reserved.
关键词[WOS]: MIXED-OXIDE CATALYST ;  ANTIMONY OXIDES ;  SURFACES ;  AMMOXIDATION ;  CONVERSION ;  ISOBUTANE ;  VANADIUM ;  ETHANOL ;  OXYGEN ;  SIO2
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000237709300014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/98197
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.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Zhang, HD,Sun, KQ,Feng, ZC,et al. Studies on the SbOx species of SbOx/SiO2 catalysts for methane-selective oxidation to formaldehyde[J]. APPLIED CATALYSIS A-GENERAL,2006,305(1):110-119.
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