Mesoporous single-crystal Cr₂O₃: Synthesis, characterization, and its activity in toluene removal

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• 作者：Yangang Wang ; Xiaohong Yuan ; Xiaohui Liu ; Jiawen Ren ; Weiyi Tong ; Yanqin Wang ; Guanzhong Lu
• 关键词：Mesoporous ; Single-crystal Cr₂O₃ ; Hard-templating pathway ; Toluene oxidation
• 刊名：Solid State Sciences
• 出版年：2008
• 出版时间：September 2008
• 年：2008
• 卷：10
• 期：9
• 页码：1117-1123
• 全文大小：1146 K

文摘

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 °C, interval 100 °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 N₂-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.