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Studies on the SbOx species of SbOx/SiO2 catalysts for methane-selective oxidation to formaldehyde
Zhang, HD; Sun, KQ; Feng, ZC; Ying, PL; Li, C; Li C(李灿); Li C(李灿)
关键词Antimony Oxide Species Evolution Methane Selective Oxidation Formaldehyde
刊名APPLIED CATALYSIS A-GENERAL
2006-05-17
DOI10.1016/j.apeata.2006.02.038
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
关键词[WOS]MIXED-OXIDE CATALYST ; ANTIMONY OXIDES ; SURFACES ; AMMOXIDATION ; CONVERSION ; ISOBUTANE ; VANADIUM ; ETHANOL ; OXYGEN ; SIO2
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.
语种英语
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WOS记录号WOS:000237709300014
引用统计
被引频次:14[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/98197
专题中国科学院大连化学物理研究所
通讯作者Li C(李灿); Li C(李灿)
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
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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.
APA Zhang, HD.,Sun, KQ.,Feng, ZC.,Ying, PL.,Li, C.,...&李灿.(2006).Studies on the SbOx species of SbOx/SiO2 catalysts for methane-selective oxidation to formaldehyde.APPLIED CATALYSIS A-GENERAL,305(1),110-119.
MLA Zhang, HD,et al."Studies on the SbOx species of SbOx/SiO2 catalysts for methane-selective oxidation to formaldehyde".APPLIED CATALYSIS A-GENERAL 305.1(2006):110-119.
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