The catalytic dehydration of ethanol was studied over spherical silica particle (SSP) and alumina-silica composite (Al-SSP). The catalysts were prepared by the modified sol-gel method with various alumina content ranging from 20 to 80 mol%. The 60Al-SSP catalyst exhibited the highest weak (Lewis) and total acid site giving the best ethanol conversion of 98% and ethylene selectivity of 99% at 400 °C and enhanced the catalytic performance with the excellent activity and stability with TOS for 10 h. Changing acid sites of catalyst due to water effect in different ethanol concentrations also led to a better ethylene selectivity.

中文翻译：

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温度和乙醇浓度对氧化铝-球形二氧化硅颗粒复合催化剂催化乙醇脱水行为的影响

研究了球形二氧化硅颗粒（SSP）和氧化铝-二氧化硅复合材料（Al-SSP）对乙醇的催化脱水作用。通过改进的溶胶-凝胶法制备催化剂，氧化铝的各种含量为20-80mol％。60Al-SSP催化剂表现出最高的弱酸（路易斯）和总酸位，在400°C时具有98％的最佳乙醇转化率和99％的乙烯选择性，并具有出色的活性和TOS稳定性，可提高催化性能10 h 。由于在不同乙醇浓度下水的作用，催化剂酸位的变化也导致更好的乙烯选择性。