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乙苯烷基化择形催化剂——改性HZSM-5分子筛的研究
The Study for Shape Selectivity of Modified HZSM-5 Zeolite on Alkylation of Ethylbenzene with Ethanol
【摘要】 HZSM-5在不同pH值对Mg2+和Mn2+的吸附量测定结果发现,HZSM-5吸附Mg2+和Mn2+的最佳pH值都在3.0附近。对Mg(Ac)2/HZSM-5和Mn(Ac)2/HZSM-5的热分解性能研究结果表明:由于Mg(Ac)2、Mn(Ac)2和载体HZSM-5之间的相互作用,使得负载型样品热分解的起始温度比纯Mg(Ac)2和Mn(Ac)2低,而完全分解的温度由纯样品的500℃左右提高到550℃左右。镁改性HZSM-5分子筛上进行乙苯与乙醇烷基化反应可直接合成高纯度的对二乙苯。在反应温度38O℃,空速6.9L·h-1下,在Mg(1.5)HZSM-5催化剂上,反应达到稳定后,对位选择性为96%,对二乙苯产率达5.8%。经Mn改性的HZSM-5催化剂上,对二乙苯产率为6.3%,乙苯转化率达7.0%,但对位选择性只有82.3%。经Mg、Mn同时改性的HZSM-5催化性能没有MgHZSM-5好。
【Abstract】 The results of the measurements of adsorption capacityfor Mg2+ and Mn2+ on HZSM-5 zeolite show that there is a maximumadsorbance near pH 3.0. The study of thermal decomposition of Mg(Ac)2 and Mn (Ac)2 indicates that the temperatures of first decomposi-tion of Mg (Ac)2/HZSM-5 and Mn (Ac)2/HZSM-5 are lower thanthose of unsupported Mg(Ac)2 and Mn(Ac)2, but the temperatures of complete decomposition are higher for the formers (550℃). Alkylationof ethylbenzene with ethanol to produce p-diethylbenzene over magne-sium modified HZSM-5 zeolite catalyst is examined. The results havemade it clear that p-selectivity of ethylalkylation and the yield of p-di-ethylbenzene at 380℃ are 96% and 5.8% respectively.
【Key words】 adsorption; thermal decomposition method; diethylbenzene; modification; HZSM-5 zeolite;
- 【文献出处】 南京理工大学学报(自然科学版) ,Journal of Nanjing University of Science and Technology , 编辑部邮箱 ,1993年03期
- 【被引频次】2
- 【下载频次】103