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以HZSM-5分子筛为催化剂,研究了常压下丙烯齐聚生成高辛烷值汽油组分的反应。结果表明:该反应较佳的工艺条件为320℃。重量空速为3～6h~(-1)。随着Na-ZSM-5钠交换度的增加,其比表面及酸中心都增加,从而使反应活性提高。残钠量小于0.01(wt)%时,其活性趋向稳定。氨的程序升温脱附实验表明:HZSM-5催化剂上同时存在着强、弱两类酸性中心,它们对反应均有催化作用。通过吡啶吸附的红外光谱分析,发现B酸中心比L酸中心更容易结焦,而催化剂后期的活性是由L酸提供的。
Using HZSM-5 zeolite as catalyst, the reaction of propylene oligomerization to produce high-octane gasoline components at atmospheric pressure was studied. The results show that the optimum reaction conditions are 320 ℃. The weight space velocity is 3 ~ 6h ~ (-1). With the increase of sodium exchange degree of Na-ZSM-5, the specific surface area and acid center increased, and the reactivity increased. Residual sodium content of less than 0.01 (wt)%, its activity tends to be stable. The temperature programmed desorption of ammonia shows that there are two kinds of strong and weak acidic sites on the catalyst of HZSM-5, which have the catalytic effect on the reaction. By infrared spectroscopy of pyridine adsorption, it was found that the B acid center is more easily coked than the L acid center, while the late catalyst activity is provided by the L acid.