富介孔-大孔的FCC催化剂基质制备工艺研究

Preparation of Macroporous-macroporous Matrix for FCC Catalyst

针对重油大分子体积大、难裂解的特点,本文对几种粘土进行筛选和改性,采用压汞法、XRF等手段对粘土改性前后的组成、孔结构进行分析,优选出介孔-大孔发达的FCC催化剂改性粘土基质,并采用该基质材料制备出具有梯度孔分布的半合成催化裂化催化剂。ACE评价结果表明,与工业品相比,新开发催化剂具有较高的重油转化率(↑1. 23%)和汽油收率(↑2. 15%)、较佳的焦炭选择性(↓1. 30%),产品分布良好,经济效益显著。

In accordance with the characteristics of heavy oil, including big size and difficult to crack, kinds of the matrixs for FCC catalyst were selected and modified, the composition and pore structure of matrix before and after modification were analyzed by mercury intrusion method and XRF, an optimized modified matrix with rich mesoporous-macroporous structure was obtained, a newly developed semi-synthetic FCC catalyst with gradient pore size distribution was prepared by the optimized modified matrix. The evaluation results of ACE unit showed that compared with commercial FCC catalyst, the new developed catalyst showed high conversion （increased 1.23 ） and high gasoline yield （increased 2.15 ） but good coke selectivity （decreased 1.30% ）, also good product distribution and a great economic benefit.