负载贵金属的层柱分子筛的氢溢流效应的研究

Study on the Effect of Hydrogen Spillover over Pillared-Layer Clay Loaded with Precious Metals

考察了Ｐｄ／γ－Ａｌ２Ｏ３及Ｐｄ／Ａｌ－ＣＬＭ两种催化剂的苯和均三甲苯加氢饱和性能。结果两种催化剂的苯加氢饱和性能相当，苯转化率均在９９％以上，饱和产物选择性分别为８１．３７％和７７．７３％；两种催化剂的均三甲苯加氢饱和性能差别较大，Ｐｄ／Ａｌ－ＣＬＭ催化剂的均三甲苯转化率为１００％，Ｐｄ／γ－Ａｌ２Ｏ３催化剂的均三甲苯转化率仅为６．１０％，饱和产物的选择性均在７７％以上。考察稀释后两种催化剂的均三甲苯加氢饱和性能，结果它们的饱和产物选择性均在７８％左右，用Ａｌ－ＣＬＭ稀释Ｐｄ／γ－Ａｌ２Ｏ３后催化剂的均三甲苯转化率为３４．７６％，用γ－Ａｌ２Ｏ３稀释Ｐｄ／γ－Ａｌ２Ｏ３后催化剂的均三甲苯转化率仅为２．１０％。结果表明，Ｐｄ／Ａｌ－ＣＬＭ催化剂中存在氢溢流现象，而且该溢流氢参与均三甲苯加氢饱和反应。

The hydrogenation of benzene and mesitylene over Pd/Al-CLM or Pd/γ-Al2O3 catalyst was studied. The property of benzene hydrogenation over the two catalysts is almost the same. The benzene conversion of the two catalysts is both above 99%, and the selectivity of the saturate productions of benzene hydrogenation is 81.37% and 77.73% respectively. There is much difference in the property of mesitylene hydrogenation over the two catalysts. The mesitylene conversion of Pd/Al-CLM is 100% and that of Pd/γ-Al2O3 is only 6.10%. The selectivity of the saturate productions of mesitylene hydrogenation is both above 77%. The property of mesitylene hydrogenation over two dilute catalysts was also studied. The selectivity of the saturate productions over the two dilute catalysts is both 78% or so. The mesitylene conversion of the Pd/γ-Al2O3 catalyst which is diluted by Al-CLM is 34.76% and that of the Pd/γ-Al2O3 catalyst which is diluted by γ-Al2O3 is only 2.10%.