热重法分析HZSM－5分子筛催化剂的表面酸性  

Study on the Surface Acidity of HZSM-5 Molecular Sieve by TGA

作　　者：庄美华[1] 沈吕宁[1] 

机构地区：[1]上海石化总厂催化研究所

出　　处：《工业催化》1994年第4期59-63,共5页Industrial Catalysis

摘　　要：本文利用岛津ＤＴ－４０热分析仪和自制的气体净化系统，采用吡啶为吸附质，对工业用的ＨＺＳＭ－５分子筛催化剂、ＨＺＳＭ－５原粉及γ－Ａｌ２Ｏ３进行了酸性测定、以脱附吡啶的量来表征样品的酸性强度，定义低温下脱附的为弱酸中心，高温下脱附的为强酸中心，根据总的脱附碱量计算出催化剂的总酸量．Measurement was made for the surface acidity of industrial HZSM-5 catalyst,HZSM-5 raw powder and γ-Al2O3 on Shimadamu DT-40 thermal analyzer,with pyridine as absorbate.Acidity of the samples was determined by the amount of desorbing pyridine.The pyridine desorbing at lower temperature range was defined as weak acid site,and at high temperature range as strong acid site,the total amount of acid sites being calculated as the total amount of desorbing pyridine.

关 键 词：催化剂 分子筛 热分析 表面酸性 热重法 

分 类 号：TQ426.94[化学工程]