以基于借氢策略的苯甲醇和苯胺一步合成N-苯基苄胺为模型反应,研究了三种不同表面结构的氧化铝对其负载的Pt-Sn催化剂上N-烷基化合成仲胺反应性能的影响.采用N2吸附-脱附法、压汞法、X射线衍射、透射电镜、扫描电镜、CO脉冲吸附、H2-程序升温还原及NH3-程序升温脱附等技术对载体和Pt-Sn/Al2O3催化剂进行了表征.结果表明,与Al2O3相互作用较弱且高度分散的Pt颗粒具有很高的催化活性,Al2O3载体较大的孔体积和大孔分布的孔结构有助于反应物扩散和吸附到催化剂表面并提高反应活性.同时也有利于反应产物从催化剂表面离开,从而提高催化剂的稳定性.然而Al2O3较强的酸性及酸性分布降低了产物仲胺的选择性和催化剂稳定性.
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