Abstract

The effect of the support nature on the hexane isomerization reaction parameters for SiO₂- and Al₂O₃-supported sulfated zirconia catalysts with different textural characteristics has been studied. It has been shown that a higher hexane conversion is achieved in the presence of sulfated zirconia catalysts supported on aluminas. Using IR spectroscopy of adsorbed CO, it has been found that, in the Al₂O₃-supported catalysts, the concentration of Brønsted acid sites (BAS) characterized by adsorbed CO with an absorption band at 2170 cm^–1 and strong Lewis acid sites (LAS) characterized by adsorbed CO with absorption bands at 2210 and 2224 cm^–1 is higher than that in the SiO₂-supported catalysts. In the Al₂O₃-supported catalysts with different textural characteristics, an increase in the contribution of LAS to the total acidity leads to a significant increase in the high-octane 2,2-dimethylbutane yield and the hexane isomerization depth.

中文翻译：

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用于己烷异构化的二氧化硅和氧化铝负载的硫酸化氧化锆催化剂：载体性质的影响

摘要

研究了不同结构特征的SiO ₂和Al ₂ O ₃负载硫酸化氧化锆催化剂的载体性质对己烷异构化反应参数的影响。已经表明，在负载于氧化铝上的硫酸化氧化锆催化剂的存在下实现了较高的己烷转化率。利用吸附CO的红外光谱发现，在Al ₂ O ₃负载的催化剂中，布朗斯台德酸中心（BAS）的浓度以吸收带为2170 cm ^–1的吸附CO和强路易斯酸中心为特征。 (LAS) 的特征是吸附 CO 的吸收带位于 2210 和 2224 cm ^–1，高于 SiO ₂负载的催化剂。在具有不同结构特征的Al ₂ O ₃负载催化剂中，LAS对总酸度的贡献增加导致高辛烷2,2-二甲基丁烷收率和己烷异构化深度显着增加。