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采用XRD、TPD、IR、比表面和孔径分布测定等方法,对文题进行了研究,并对改性分子筛的芳构化性能进行了考察。结果表明,Zn、Zn-Ga、Zn-Cr改性的分子筛表面上总酸浓度增加,强L酸浓度增加,且在吡啶吸附的IR图谱中出现1615cm~(-1)峰,从而使芳构化活性提高。表面上强B酸浓度下降,使深度裂解产物减少,芳构化性能改善。
XRD, TPD, IR, determination of specific surface area and pore size distribution were used to study the topic, and the aromatization of the modified molecular sieve was investigated. The results showed that the total acid concentration on the surface of Zn, Zn-Ga and Zn-Cr modified zeolites increased, the concentration of strong L acid increased, and the 1615cm -1 peak appeared in the IR spectra of pyridine adsorption, Increased activity. On the surface of the strong B acid concentration decreased, so that the depth of the reduced product, aromatization improved.