Assistant for improving catalytic cracking propylene yield and preparation method thereof

The invention relates to an auxiliary agent for improving catalytic cracking propylene yield and a preparation method thereof. The catalytic cracking aid is composed of an MFI structure molecular sieve, clay, pseudo-boehmite, a phosphorus compound, a binder, a modified metal compound and the like. The catalytic cracking aid for improving the propylene yield is prepared by the following preparation method: in the aid preparation process, performing acid treatment on an MFI structure molecular sieve in advance; before acidification of pseudo-boehmite, an MFI structure molecular sieve is added; the acidified colloid is homogenized and then directly subjected to spray drying and roasting, and the catalytic cracking aid for improving the propylene yield is obtained. The catalytic cracking aid disclosed by the invention is simple in preparation process, is used for a catalytic cracking process, and can effectively improve the propylene yield. 一种提高催化裂化丙烯产率的助剂及其制备方法。该催化裂化助剂以MFI结构分子筛、粘土、拟薄水铝石、磷化合物、粘结剂、改性金属化合物等为组成。所述的提