Co^(2+)-NaX催化膜的制备及其催化苯乙烯环氧化性能

Preparation and catalytic performance of Co^(2+)-NaX membrane for styrene epoxidation

采用水热法在α-Al2O3陶瓷管载体外表面原位合成X分子筛膜,再将其与Co(NO3)2·6H2O离子交换制备催化膜,采用XRD、SEM、ICP等手段对催化膜进行表征,结果表明,催化膜牢固均匀地负载在载体的表面,其厚度约20μm,催化膜Co2+含量为8.40%。将其制备的催化接触型膜反应器用于苯乙烯氧气环氧化反应,并与相同Co2+含量的颗粒催化剂的性能进行比较,催化膜比颗粒催化剂具有更优的催化活性,其经7次循环使用,活性和稳定性仍比较好,在反应过程中催化膜中的Co2+没有发生流失。

Supported NaX zeolite membranes were successfully prepared on the outer surface of α-alumina tube via in-situ hydrothermal synthesis followed by ion-exchange with Co（NO3）2·6H2O for preparing catalytic membranes.The catalytic membrane samples were characterized by XRD,SEM and ICP.Results showed that the formation catalytic membranes was successful with an average thickness of 20 μm and the Co2＋ content of about 8.40%.The catalytic contact membrane reactor prepared with the prepared catalytic membrane was used for styrene epoxidation,which exhibited higher catalytic activity than that of particulate catalyst with same Co2＋ content.The catalytic membrane can be reused for seven times with high activity and stability,and no Co2＋ loss was detected in the reaction system.