高中油型加氢裂化催化剂用Y型沸石的改性研究

Modification of zeolite Y for preparation of the maxinizing middle distillates hydrocracking catalyst

采用络合-水热-酸联合处理的方法对Y沸石进行了改性,改性后的沸石用于制备高中油型加氢裂化催化剂,并考察了沸石改性对高中油型加氢裂化催化剂反应效果的影响。氮吸附、XRD、TEM和吡啶吸附-脱附红外光谱法等表征结果表明,酸处理可以有效脱除分子筛中的非骨架铝,增加改性Y沸石的比表面积和二次孔的孔容,并起到优化酸中心的目的。反应评价结果表明,Y沸石经酸处理改性后,由于比表面积、二次孔孔容的增加和酸性的优化,所制得的催化剂可明显提高高中油型加氢裂化加氢裂化的中油收率。

Y zeolites prepared by different modification methods were compared and characterized by N2 sorption isotherms, XRD, Py-IR, and TEM techniques. Catalysts of W-Ni supported on the modified Y zeolites with or without acid treatment were prepared by impregnation method, and the hydrocraeking of vacuum gasoil （VGO） was performed on these catalysts. The results show that addition of acid treatment process after the Y zeolites modified procedure can increase the surface area, mesopore volume, and optimize acid sites of the modified Y zeolite. The catalyst using modified Y zeolites with acid treatment process exhibits better catalytic performance, higher yield and selectivity of middle distillates than the others.