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Titania Morphology-Dependent Gold-Titania Interaction, Structure, and Catalytic Performance of Gold/Titania Catalysts
Chen, Shilong; Zhang, Bingsen; Su, Dangsheng; Huang, Weixin; huangwx@ustc.edu.cn
2015
发表期刊CHEMCATCHEM
ISSN1867-3880
卷号7期号:20页码:3290-3298
摘要Employing anatase TiO2 nanocrystals with predominantly {001} facets, anatase TiO2 nanocrystals with predominantly {100} facets, and TiO2 P25 with predominantly {101} facets as supports, we have comprehensively studied the morphology effect of TiO2 on the Au-TiO2 interaction, structure, and catalytic performance of Au/TiO2 catalysts in C3H6 epoxidation with H-2 and O-2, C3H6 oxidation with O-2, and H-2 oxidation. A strong morphology-dependent interplay between the Au-TiO2 interaction and the catalyst structure was observed. Only Au nanoparticles were present in the Au/TiO2 catalysts and the Au- species was the largest in Au/TiO2{001} due to the creation of surface O vacancies of TiO2{001} upon Au loading, whereas the fraction of Au+ species was largest in Au/TiO2{100} due to the preserved surface stoichiometry of TiO2{100} upon Au loading. In H-2 oxidation, Au/TiO2{100} with the largest fraction of Au+ species was the most active but least selective toward H2O2, whereas Au/TiO2{001} with the largest fraction of Au- species was the most selective toward H2O2. In C3H6 oxidation with O-2, tiny C3H6 conversions with the formation of partial oxidation products were observed at low temperatures, whereas C3H6 combustion occurred at high temperatures. In C3H6 epoxidation with O-2 and H-2, the ensemble consisting of closely connected Au- and Ti4+ on anatase TiO2{001} and {101} facets with weak adsorption ability was the active structure and the Au/TiO2{001} catalyst containing the largest amount of this ensemble was the most active. These results demonstrated morphological engineering of oxides as an effective strategy to optimize the catalytic performance and understand the fundamentals of catalysis involving oxides.
部门归属[chen, shilong ; huang, weixin] univ sci & technol china, dept chem phys, cas key lab mat energy convers, hefei natl lab phys sci microscale, hefei 230026, peoples r china ; [zhang, bingsen ; su, dangsheng] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
关键词Gold Metal-oxide Interactions Nanocatalysis Nanocrystals Surface Chemistry
资助者Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09030103]; National Basic Research Program of China [2013CB933104]; National Natural Science Foundation of China [U1332113, 21373192]; MOE Fundamental Research Funds for the Central Universities [WK2060030017]; Collaborative Innovation Center of Suzhou Nano Science and Technology
收录类别sci
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/75218
专题中国科学院金属研究所
通讯作者huangwx@ustc.edu.cn
推荐引用方式
GB/T 7714
Chen, Shilong,Zhang, Bingsen,Su, Dangsheng,et al. Titania Morphology-Dependent Gold-Titania Interaction, Structure, and Catalytic Performance of Gold/Titania Catalysts[J]. CHEMCATCHEM,2015,7(20):3290-3298.
APA Chen, Shilong,Zhang, Bingsen,Su, Dangsheng,Huang, Weixin,&huangwx@ustc.edu.cn.(2015).Titania Morphology-Dependent Gold-Titania Interaction, Structure, and Catalytic Performance of Gold/Titania Catalysts.CHEMCATCHEM,7(20),3290-3298.
MLA Chen, Shilong,et al."Titania Morphology-Dependent Gold-Titania Interaction, Structure, and Catalytic Performance of Gold/Titania Catalysts".CHEMCATCHEM 7.20(2015):3290-3298.
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