研究了MoPO/SiO2催化剂对丙烷选择氧化制丙烯醛的催化性能. MoO/SiO2催化剂主要表现出对丙烷氧化脱氢的催化性能,在该催化剂中添加磷后,丙烷转化率和选择氧化产物丙烯醛的选择性明显提高. 催化剂的X射线衍射、拉曼光谱、程序升温还原、吡啶吸附红外光谱和程序升温脱附等表征结果表明,MoO/SiO2催化剂主要含有MoO3晶相,添加磷后,形成了表面多钼酸物种,磷以PO4四面体结构存在于表面,可能形成部分Mo-O-P键,从而抑制了MoO3在MoPO/SiO2上的形成,起到分隔活性中心的作用. 在MoO/SiO2催化剂中添加磷后,催化剂的B酸和L酸酸性均增强,有利于丙烷在MoPO/SiO2催化剂表面活性的提高. 由此可见,催化剂表面结构和酸性的变化可能是导致MoPO/SiO2催化性能提高的原因.
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