采用溶胶-凝胶法制备了MoVO/AIPO4和MoVBiO/AIPO4催化剂,运用X射线衍射、激光拉曼光谱、X光电子能谱、程序升温还原对催化剂进行了表征,考察了Bi的添加对催化剂结构及其催化异丁烯选择氧化制甲基丙烯醛(MAL)反应性能的影响.结果表明,适量Bi的引入可显著提高MoVO-AIPO4上异丁烯选择氧化反应性能,MAL选择性由29.1%提高至75.2%.这与Bi的加入降低了催化剂表面强酸位数量,促进了Mo氧化物和V氧化物的分散和提高了催化剂表面V5+/V4+比例有关.
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