发明名称 ULTRA-STABLE RARE EARTH Y-TYPE MOLECULAR SIEVE AND PREPARATION METHOD THEREFOR
摘要 The present invention provides an ultra-stable rare earth type Y molecular sieve and the preparation method thereof, which method is carried out by subjecting a NaY molecular sieve as the raw material to a rare earth exchange and a dispersing pre-exchange, then to an ultra-stabilization calcination treatment. The molecular sieve comprises 1 to 20% by weight of rare earth oxide, not more than 1.2% by weight of sodium oxide, has a crystallinity of 51 to 69%, and a lattice parameter of 2.451 nm to 2.469 nm. In contrast to the prior art, in the molecular sieve prepared by this method, rare earth ions are located in sodalite cages, which is demonstrated by the fact that no rare earth ion is lost during the reverse exchange process. Moreover, the molecular sieve prepared by such a method has a molecular particle size D(v,0.5) of not more than 3.0 μm and a D(v,0.9) of not more than 20 μm. Cracking catalysts using the molecular sieve as an active component is characterized by a high heavy-oil-conversion capacity and a high yield of valuable target products.
申请公布号 US2015151284(A1) 申请公布日期 2015.06.04
申请号 US201214365489 申请日期 2012.04.13
申请人 PetroChina Company Limited 发明人 Gao Xionghou;Zhang Haitao;Tan Zhengguo;Li Di;JI Dong;Duan Hongchang;Zhang Chenxi
分类号 B01J29/08;C01B39/02;C01B39/24 主分类号 B01J29/08
代理机构 代理人
主权项 1. An ultra-stable rare earth type Y molecular sieve, characterized in that the molecular sieve comprises 1% to 20% by weight of rare earth oxide and not more than 1.2% by weight of sodium oxide, and has a crystallinity of 51% to 69% and a lattice parameter of 2.449 nm to 2.469 nm; the preparation process of the molecular sieve including a rare earth exchange and a dispersing pre-exchange, wherein the order of the rare earth exchange and the dispersing pre-exchange is not limited, and the rare earth exchange and the dispersing pre-exchange are consecutively conducted without a calcination process therebetween; wherein the dispersing pre-exchange refers to a process of adjusting the molecular sieve slurry's concentration to a solid content of 80 to 400 g/L and adding 0.2% to 7% by weight of a dispersing agent to carry out dispersing pre-exchange at an exchange temperature of 0 to 100° C. for 0.1 to 1.5 h; the dispersing agent in the dispersing pre-exchange process is selected from one or more of sesbania gum powder, boric acid, urea, ethanol, polyacrylamide, acetic acid, oxalic acid, adipic acid, formic acid, hydrochloric acid, nitric acid, citric acid, salicylic acid, tartaric acid, benzoic acid, and starch; no ammonium salt is used in the rare earth exchange or the dispersing pre-exchange.
地址 Beijing CN