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在100磅/时~2(表压)压力下,用异戊二烯和噻吩-环已烯模型化合物的脉冲微反技术,研究了Mgo及其添加物担载的CoMo催化剂的选择加氢性能。结果表明,催化剂对于共轭双烯的加氢是高活性和高选择性的。它可近于完全地生成单烯,没有发现聚合或生焦反应。产品主要由内烯和少量的α-烯所组成,由此讨论了共轭双烯的加氢反应机理。同时,催化剂的反应能力随活性金属含量及其配比而改变。它们的活性、选择性、以及机械强度可用加入Al_2O_3和ZnO的办法而得到改善。在噻吩和环已烯的反应中,加氢和脱硫作用发生在相同的活性中心上,加氢活性随脱硫率的增加而被抑制。因此,在相同的脱硫转化水平下,虽然这一类型催化剂的活性金属含量只是A l_2O_3型载体工业催化剂的1/2.5～1/4,但其加氢脱硫选择性却高出好几倍。
The selective hydrogenation behavior of CoMo catalysts supported on Mgo and its additives was studied at a pressure of 100 lbs / hr to 2 (gauge pressure) using a pulsed micro-inverse technique of isoprene and thiophene-cyclohexene model compounds . The results show that the catalyst is highly active and highly selective for the hydrogenation of conjugated dienes. It produces nearly mono-olefins almost completely without any polymerization or char reactions. The product mainly consists of an internal olefin and a small amount of α-olefin, thus the hydrogenation reaction mechanism of the conjugated diene is discussed. At the same time, the reactivity of the catalyst changes with the active metal content and its ratio. Their activity, selectivity, and mechanical strength can be improved by the addition of Al 2 O 3 and ZnO. In the reaction of thiophene with cyclohexene, the hydrogenation and desulfurization occur at the same active site, and the hydrogenation activity is inhibited with the increase of desulfurization rate. Therefore, at the same desulfurization conversion level, although the active metal content of this type of catalyst is only 1 / 2.5 ~ 1/4 of the industrial catalyst of A l_2O_3 type carrier, the selectivity for hydrodesulfurization is several times higher.