渣油FCC改性Y沸石研究

研究了不同方法和不同程度脱铝对Y型沸石浸镧老化后的结构性质和催化裂化性能的影响。结果表明，氟硅酸铵脱铝补硅和水热处理两个步骤联合，所得样品骨架铝分布均匀，通过控制脱铝程度可更有效地抑制结焦并保持催化裂化高活性；草酸脱铝和水热处理联合，所得样品二次孔结构发达，具有更好的渣油裂化生成液态低碳烃选择性。

Study on dealuminated Y zeolite for residue FCC

A series of ultrastable Y zeolites with varies Si/Al mol ratio prepared by different dealumination methods have been investigated. After modification by lanthanum incorporation and aging at 800℃ in 100% steam for 4h, the pore structure and acidic property of dealuminated Y zeolites were characterized by nitrogen adsorption and pyridine-IR methods. The catalytic cracking performances were evaluated with microactivity test (MAT) of fluid catalytic cracking (FCC). It is found that LaFSY samples prepared by using (NH4)2SiF6 as the dealumination reactant combined with hydrothermal treatment have homogeneous framework aluminum distribution, and a performance of high cracking activity and low coke yield in FCC is obtained by controlling the dealumination extent using the dealumination method. The LaOSY sample prepared by using oxalic acid as the dealumination reactant combined with hydrothermal treatment has a large mesopore volume which gives the sample a performance of better liquid yield selectivity for residue catalytic cracking.