期刊
SOLID STATE SCIENCES
卷 10, 期 9, 页码 1117-1123出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2007.11.018
关键词
mesoporous; single-crystal Cr2O3; hard-templating pathway; toluene oxidation
资金
- National Basic Research Program of China [2004CB719500]
- New Century Excellent Talents in University [NCET-05-415]
- National Natural Science Foundation of China [20673037]
- Commission of Science and Technology of Shanghai Municipality [06DJ14006, 05PJ14032, 0552nm030]
In this paper, a series of ordered mesoporous single-crystal Cr2O3 samples were synthesized through a hard-templating pathway by using three-dimensional (3D) cubic mesoporous silica, KIT-6, as the template and chromium nitrate as the precursor. In the synthesis, the intermediate composites (chromium nitrate/KIT-6) were calcined in air for 4 h at different temperatures (from 400 to 700 degrees C, interval 100 degrees C) to decompose the nitrate species. Then, the silica template was removed by dissolution in 10% HF solution twice. The resulting Cr2O3 samples were characterized by XRD, TEM, XPS, and N-2-sorption analysis and their catalytic properties were also investigated in the oxidation of toluene. These results showed that the obtained ordered mesoporous Cr2O3 are exact reverse-replica of the template. It was also found that the catalytic activity was related to mesostructure and/or surface area as well as the calcination temperatures. (C) 2007 Elsevier Masson SAS. All rights reserved.
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