Preparing method of hydrocarbon cracking catalyst

Abstract

The hydrocarbon cracking catalyst consists of molecular sieve 10-60wt%, clay 0-75wt%, silicon adhesive accounting in silica 5-40wt%, alumina 0.1-10wt%, and modifying component accounting in oxide 0-10wt%. The catalyst is prepared through the sol-gel process of maintaining the catalyst in sol state before formation and spray drying at 50-150 deg.c to create microball gel, and subsequent ageing and pore expanding treatment. The catalyst has high matrix cracking activity and is favorable to the cracking of heavy oil and residual oil.

Description

technical field [0001] The invention relates to a hydrocarbon catalytic cracking catalyst and its application, more specifically to a semi-synthetic hydrocarbon cracking catalyst with silica sol as a binder and its application. Background technique [0002] In recent years, due to the heavy and inferior quality of raw materials, the content of molecular sieves in catalysts has been increasing continuously. The catalyst carrier with pseudo-boehmite and aluminum sol as a binder can no longer tolerate further increases in the amount of molecular sieves, resulting in catalyst resistance. The abrasiveness is poor. In addition, the prices of pseudo-boehmite and alumina sol are relatively high, resulting in high catalyst costs. Therefore, it is necessary to improve the cohesiveness of the catalyst carrier to ensure that the catalyst has good wear resistance during use. [0003] U.S. Patent No. 3,867,308 discloses a catalyst prepared by a semi-synthetic process using sodium-contain...

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Problems solved by technology

However, the catalyst prepared by this method also has unfavorable factors such as large bulk density, low surface area, and small pore volume; moreover, two kinds of silica sols are used in its preparation method, one is ion-exchanged low-sodium silica sol, The other is silica sol containing aluminum sulfate buffer solution, so the preparation process is relatively complicated

[0010] It can be seen from the previous work that the semi-synthetic catalytic cracking catalyst prepared by using sodium-containing silica sol as a binder has good wear resistance, and the preparation process is simple, and the price of silica sol is also lower than that of pseudo-boehmite and Aluminum sol is cheap, but there are unfavorable factors such as large bulk density, low surface area, small pore volume, and low matrix activity.

Although the introduction of alumina can make the catalyst have more mesopores, or improve the cracking activity and heavy metal resistance of the catalyst, but the problems of high bulk density, low surface area and small pore volume of the catalyst still exist.