Catalytic cracking catalyst, its preparation and use

摘要

A catalyst for catalytically cracking hydrocarbon oils contains a substrate comprising alumina and a molecular sieve, characterized in that the pore distribution of said catalyst is 5-70% of the <2 nm pores, 5-70% of the 2-4 nm pores, 0-10% of the 4-6 nm pores, 20-80% of the 6-20 nm pores, and 0-40% of the 20-100 nm pores, based on the pore volume of pores having a size of no more than 100 nm. The catalyst of this invention has a large BET pore volume, a high capacity for cracking heavy oils, and a high capacity for resisting coking.

主权项

1. A catalyst for catalytically cracking hydrocarbon oils, comprising a molecular sieve and a substrate comprising alumina,
wherein said catalyst has a pore volume of 0.196-0.26 ml/g, and a pore distribution of 13-35% of the <2 nm pores, 10-37% of the 2-4 nm pores, about 1-7% of the 4-6 nm pores, 20-75% of the 6-20 nm pores and 1-27% of the 20-100 nm pores, based on a pore volume of the pores having a size of no more than 100 nm, wherein the pore volume and the pore size distribution is determined using a nitrogen adsorption volumetric method, wherein the molecular sieve comprises 76-85 wt. % of MFI-structured zeolite, 6-18 wt. % of Y-zeolite, and 0-18 wt. % of β-zeolite, and wherein said catalyst is prepared using a pore extender selected from the group consisting of boric acid, and borates, sulfates, nitrates, carbonates, hydrochlorides of Na, K, or lithium.