采用改进的酸催化溶胶-凝胶法制备了以TiO2为基体的钛基复合氧化物催化剂,并将该催化剂用于低温下二氧化碳气氛中乙苯氧化脱氢制苯乙烯反应.采用X射线衍射、表面物理吸附、X射线光电子能谱和热重-质谱等分析手段对反应前后的催化剂进行表征.结果表明,催化剂在一定反应条件下具有较好的催化活性.催化剂失活原因主要是反应过程中产生了积炭和高价钒被还原成低价钒.反应过程中产生的积炭可以通过空气氧化消除,再生后的催化剂其活性基本上能得到恢复.
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