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研究了氦和丙烯预处理后的Re_2O_7/γ-Al_2O_3催化剂上丙烯歧化的温度效应和报导了反应后催化剂上铼离子的价态分布的XPS测定结果。氦处理后,高铼离子密度的催化剂在高温下显示较高的活性。相反,丙烯处理后低铼离子密度的催化剂在较低温度下显示较高的活性。反应后催化剂的XPS测定表明铼离子处于各种不同的价态。用丙烯处理的反应后的催化剂,其还原程度大于氦处理的经反应的催化剂。
The temperature effect of propylene disproportionation on the Re_2O_7 / γ-Al_2O_3 catalyst pretreated with helium and propylene and the XPS measurement results of the valence distribution of rhenium ions on the catalyst were reported. After helium treatment, catalysts with high rhenium ion densities show higher activity at elevated temperatures. In contrast, catalysts with low rhenium ion densities after propylene treatment show higher activity at lower temperatures. The XPS of the catalyst after the reaction shows that the rhenium ions are in various valence states. The post-reacted catalyst treated with propylene is more reduced than the helium-treated reacted catalyst.