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HZSM-5在不同pH值对Mg~(2+)和Mn~(2+)的吸附量测定结果发现,HZSM-5吸附Mg~(2+)和Mn~(2+)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。
The adsorption of HZSM-5 on Mg 2+ and Mn 2+ at different pH values showed that HZSM-5 had the best pH value for adsorbing Mg 2+ and Mn 2+ All around 3.0. The results of thermal decomposition of Mg (Ac) _2 / HZSM-5 and Mn (Ac) _2 / HZSM-5 show that due to the interaction between Mg (Ac) _2, Mn (Ac) _2 and HZSM-5 (Ac) _2 and Mn (Ac) _2, while the temperature of complete decomposition increased from about 500 ℃ to about 550 ℃ for pure samples. Magnesium modified HZSM-5 zeolite ethylbenzene and ethanol alkylation reaction can be directly synthesized high purity p-diethylbenzene. After the reaction reached a steady state at a reaction temperature of 38 ℃ and a space velocity of 6.9 L · h -1 on a Mg (1.5) HZSM-5 catalyst, the para-selectivity was 96% 5.8%. On Mn-modified HZSM-5 catalyst, the yield of p-diethylbenzene was 6.3% and the conversion of ethylbenzene was 7.0%, but the para-selectivity was only 82.3%. The catalytic performance of HZSM-5 modified by Mg and Mn at the same time is better than that of MgHZSM-5.