MTO催化剂中国专利技术进展(二)——SAPO系列分子筛  

Advances in Proprietary MTO Catalyst Technology in China (Ⅱ)——SAPO Series Molecular Sieves

作　　者：史建公[1] 刘志坚[2] 张敏宏[1] 张毅[1] 赵桂良[1,2] 张新军[1] 

机构地区：[1]中国石化催化剂北京燕山分公司,北京102400 [2]中国石化催化剂有限公司,北京100029

出　　处：《中外能源》2013年第9期63-72,共10页Sino-Global Energy

基　　金：中国石油化工股份有限公司科研经费资助项目;项目编号:411023

摘　　要：SAPO-34分子筛的结构特征,使其在MTO工艺中可以高选择性地将甲醇转化为乙烯、丙烯。纯的SAPO-34用作MTO催化剂时,催化效率相对较低,通常需要对SAPO-34进行酸性调整、酸中心调整以及孔口径尺寸调整等改性。通过将金属元素引入SAPO-34分子筛骨架上,改变分子筛酸性和孔口径大小,得到小孔口径和中等强度的酸中心,而孔口径变小限制了大分子的扩散,有利于小分子烯烃选择性的提高。认为采取复合改性的方法,是分子筛改性的最直接、最经济、最简便和最容易取得效果的方法。有时,将具有不同孔口径、不同结构的分子筛按一定比例进行物理复合,制成的复合分子筛的性能完全满足工艺要求,而其成本却是最低的。从SAPO-34分子筛、流化床SAPO分子筛、金属改性SAPO分子筛,SAPO分子筛的预处理,复合分子筛,核壳结构催化剂及催化剂的再生等方面,综述了MTO工艺用SAPO系列分子筛的中国专利技术进展。The characteristics of the structure of SAPO-34 molecular sieves enable them to highly selectively convert methanol to ethylene and propylene in MTO technology.When used as MTO catalyst,pure SAPO-34 has relative low catalytic efficiency.Therefore,modifications to SAPO-34 are usually required,including adjusting its acidity,acid site and hole diameter.Metallic elements can be introduced into the skeleton of SAPO-34 molecular sieves to change the acidity and hole diameter of the molecular sieves to obtain smaller hole diameter and an acid site with moderate intensity.Smaller hole diameter can restrain the diffusion of large molecules and promote the enhancement of the selectivity of small-molecule olefin.The authors of the article believe that compound modification is the most direct,most economic,simplest and easiest method for modifying molecular sieves.In some cases,the performance of a compound molecular sieve produced through physical combination of molecular sieves with different hole diameters and structures in certain proportion can fully meet technical requirements and the cost of such molecular sieve is often the lowest.This article examines the advances in China′ s proprietary SAPO series molecular sieves for use in MTO technology by describing SAPO-34 molecular sieves,fluidized-bed SAPO molecular sieves,metallic modified SAPO molecular sieves,the pretreatment of SAPO molecular sieves,compound molecular sieves,catalysts with core-shell structures and the regeneration of catalysts.

关 键 词：MTO SAPO-34 分子筛 专利进展 综述 

分 类 号：TE624.9[石油与天然气工程—油气加工工程]