碱土金属氧化物改性的HZSM-5表面酸性和苯、乙醇烷基化反应活性、选择性研究

A Study of Surface Acidity and Activity and Selectivity for Alkylation Benzene with Ethanol of HZSM-5 Modified Base-earth Metal Oxides

用TPD、IR技术研究了MgO、CaO和BaO改性的HZSM-5表面酸性,并以苯、乙醇烷基化合成乙苯反应考察了催化剂的活性和选择性。结果表明,随着氧化物含量的增加,氨的TPD量下降,IR谱图上1550cm^(-1)(B酸)吸收峰减小,活性及选择性均下降(MgO含量为3％时选择性最高)。

The Surface acidities of HZSM-5 modified MgO, CaO, BaO were studied by means of TPD, IR, and the activity and the selectivity of alkylation benzene with ethanol to ethylbenzene were investigated. The results indicate that NH3 desorption amount, 1550 cm-1 (B-acid) on the IR spectra, activity and selectivity of alkylation decrease with increasing the content of oxide. Active sites of alkylation was discussed in this work.