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合成了Pt羰基化合物〔Pt_3(CO)_6〕_5〔N(C_2H_5)_4〕_2,并将其固载于Al_2O_3上,在500℃,1.2MPa下考察了该催化剂的正庚烷转化反应性能,比常规氯铂酸溶液浸渍制备的Pt催化剂芳构化产率提高6 ％,且稳定性亦有明显提高。在催化剂脱羰活化过程中,脱出的CO发生歧化反应,形成表面碳物种,这种表面高分散的碳物种和表面Pt晶粒的均匀性是该催化剂在高温下具有高芳构化选择性和稳定性的重要原因。
The Pt carbonyl compound [Pt_3 (CO) 6] _5 [N (C_2H_5) _4] _2 was synthesized and immobilized on Al 2 O 3. The conversion of n-heptane at 500 ℃ and 1.2 MPa was investigated. Compared with the conventional chloroplatinic acid solution, the Pt catalyst prepared by impregnation increased the yield of aromatization by 6% and the stability was significantly improved. During the decarbonylation of catalysts, disproportionation of CO occurs to form surface carbon species. The homogeneity of such surface highly dispersed carbon species and surface Pt grains is that the catalyst has high aromatization selectivity and stability at high temperatures The important reason.