Selective Oxidation and Oxidative Dehydrogenation of Isobutane over Hydrothermally Synthesized Mo鈥揤鈥揙 Mixed Oxide Catalysts

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• 作者：Jingqi Guan ; Haiyan Xu ; Ke Song ; Bo Liu ; Fanpeng Shang ; Xiaofang Yu and Qiubin Kan
• 关键词：Isobutane ; Isobutene ; Selective oxidation ; Methacrolein ; Mo– ; V– ; O mixed oxide catalysts
• 刊名：Catalysis Letters
• 出版时间：December, 2008
• 出版年：2008
• 期刊代码：13_1011372X
• 类别：ch
• 卷：126
• 期：3-4
• 页码：293-300
• 数据来源：sp

摘要

A series of Mo–V–O catalysts were prepared by calcining the orthorhombic (M1) Mo–V–O phase containing precursors under different conditions (T = 500 or 600 掳C in atmosphere of N₂ or air) and tested for the oxidation of isobutane and isobutene. Characterization results (BET, XRD, XPS, FTIR, and TPR) showed that their structure and properties depend on the composition of the calcined samples and the calcined conditions. Catalytic tests showed that relatively high isobutane conversion and desired product selectivity can be achieved over MoV_0.3-500-N and MoV_0.3-600-A catalysts. It is also found that both orthorhombic M1 phase and (V_0.07M_0.93)₅O₁₄ phase are active and selective for the selective oxidation of isobutane to methacrolein, whereas higher selectivity toward methacrolein (40.4%) can be achieved over the former phase at a moderate isobutane conversion (6.4%). Moreover, (Mo_0.3V_0.7)₂O₅ phase may be propitious to complete oxidation for the selective oxidation of isobutane. On the other hand, the presence of V affects the activity and selectivity, and a low surface V4+ concentration prefers selective oxidation products. In addition, specific surface areas of the catalysts appear to be little important in determining the catalytic activation.