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采用Friedel-Craft反应,乙酸酐作为酰化剂,对焦化苯进行脱硫精制。通过对比MCM-41、HZSM-5和Mont-K10及其负载型催化剂的催化活性,发现未负载型Mont-K10具有最高的催化活性,并且随着ZnCl2负载量的增大,催化活性反而降低。采用FT-IR对固体酸催化乙酰化反应机理进行探讨,发现固体酸表面的L酸是此反应的活性中心,负载ZnCl2不仅能改变酸位的数量而且能改变酸的强度。通过对反应条件进行优化,转化率可以达到99.4%。对Mont-K10催化寿命的考察结果表明,经过3次再生还原,催化剂的催化活性仍能恢复,转化率仍在90%以上,只不过处理量减少为原来的一半。
Using Friedel-Craft reaction, acetic anhydride as acylating agent, coking benzene desulfurization purification. By comparing the catalytic activity of MCM-41, HZSM-5 and Mont-K10 and their supported catalysts, it was found that the unsupported Mont-K10 had the highest catalytic activity and the catalytic activity decreased with the increase of ZnCl2 loading. The mechanism of acetylation of solid acid catalyzed by FT-IR was explored. It was found that the L acid on the surface of solid acid was the active center of this reaction. The loading of ZnCl2 could not only change the number of acid sites but also the acid strength. By optimizing the reaction conditions, the conversion rate can reach 99.4%. The investigation of the catalytic life of Mont-K10 showed that after three regeneration reductions, the catalytic activity of the catalyst can still be recovered and the conversion rate is still over 90%, only reducing the treatment volume to half.