甲醇制烯烃催化剂SAPO-34分子筛的改性研究进展  

Research progress on modification of SAPO-34 as catalyst for methanol to olefins

作　　者：季超 武鲁明 李滨 臧甲忠 于海斌 JI Chao;WU Luming;LI Bin;ZANG Jiazhong;YU Haibin(CenerTech Tianjin Chemical Research and Design Institute Co.,Ltd.,Tianjin 300131,China)

机构地区：[1]中海油天津化工研究设计院有限公司,天津300131

出　　处：《无机盐工业》2022年第7期1-9,90,共10页Inorganic Chemicals Industry

基　　金：中国海洋石油集团有限公司项目(CNOOC-KJ 135 ZDXM 32 TJY 003 TJY 2020)。

摘　　要：甲醇制烯烃(MTO)被认为是最有希望以煤或天然气为原料替代石油制取烯烃的技术路线。具有CHA结构的SAPO-34分子筛是MTO反应生产乙烯和丙烯最理想的催化剂,但在甲醇转化过程中,芳香烃类中间体受到SAPO-34分子筛八元环微孔结构的限制,使催化剂孔道堵塞并覆盖其酸性位点,造成催化剂积炭失活。为了提高SAPO-34分子筛催化剂的寿命和低碳烯烃的选择性,改善传质并延缓焦炭的沉积至关重要。从构建多级孔结构、减小晶粒尺寸及调控分子筛酸性3个方面出发,总结了SAPO-34分子筛在MTO反应中的研究进展,并对今后催化剂的粒度、孔尺寸、酸性质等方向的改进及发展进行了展望。Methanol to olefins(MTO)is considered to be the most promising technology route with coal or natural gas to pro⁃duce olefins by replacing petroleum.SAPO-34 with CHA structure is the most ideal catalyst for MTO reaction to produce ethylene and propylene.However,aromatic hydrocarbon intermediates are limited by the eight membered ring microporous structure of SAPO-34,which blocks the pores of the catalyst and covers its acid sites,resulting in the carbon deposition and deactivation of the catalyst in the process of methanol conversion.In order to improve the life of SAPO-34 catalyst and the selectivity of low⁃carbon olefins,it is very important to improve mass transfer and delay coke deposition.The research prog⁃ress on SAPO-34 in MTO reaction was summarized from the three aspects of constructing hierarchical pore structure,reduc⁃ing the grain size and regulating molecular sieve acidity.Furthermore,the improvement and development direction of cata⁃lyst from particle size,pore size,acidity in the future were prospected.

关 键 词：SAPO-34分子筛 甲醇制烯烃 纳米尺寸 多级孔 催化剂 

分 类 号：TQ221.2[化学工程—有机化工] TQ426