文献类型：期刊文献

英文题名：Effect of surface acidity of HZSM -5 molecular sieve catalyst on direct animation of isobutene

作者：Jin, Xingmei; Ma, Yunfei; Guo, Shizhuo; Shu, Xingtian; He, Xiaopeng

机构：[1] Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, China; [2] Chemical Research Institute of Shanghai Petrochemical Company Limited,, Shanghai 200540, China; [3] Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China

年份：2005

卷号：34

期号：10

起止页码：948

外文期刊名：Shiyou Huagong/Petrochemical Technology

收录：EI(收录号：2005459460257)

语种：英文

摘要：Effect of modification with different metallic ions on activity of HZSM-5 molecular sieve catalyst in direct amination of isobutene was investigated. Catalyst modified with cerium had excellent activity. Under optimal conditions: reaction temperature 230 t, total pressure 0.5 MPa, mole ratio of ammonia to isobutene 2:1, and space velocity of isobutene 450 h-1, conversion of isobutene was 3.1%, which was 67.53% of equilibrium conversion. According to In - situ IR spectra with pyridine as probe molecule, strength and concentration of B acid sites increased due to adding cerium to catalyst. By means of In-situ IR spectra and transient response technique, amination mechanism could be inferred as follows: chemisorbed ammonia first reacted with gaseous isobutene and tert-butyl cation, an intermediate formed. It successively reacted with ammonia to produce ten-butylamine.