摘要
直接法ＺＳＭ┐５沸石分子筛骨架铝的迁脱规律张悝项寿鹤刘上垣王敬中李赫日亘（南开大学化学系，天津３０００７１）关键词直接法，ＨＺＳＭ－５沸石，脱铝，水热处理ＨＺＳＭ－５沸石分子筛骨架铝的迁脱与其催化活性和稳定性密切相关．汪树军等［１］的研究得到了一些有...
The migration of framework Al and surface acidity of HZSM 5 zeolite synthesized by direct method after steaming at different temperatures and washed with 1 mol/L HCl solution were examined by using XRD, 27 Al MASNMR, and IR spectra of pyridine adsorption. It is discovered that with the increase of the steaming temperature, the dealumination degree of HZSM 5 increases. Under the experimental conditions (673￣1123 K), the structure of HZSM 5 synthesized by direct method is stable, and its framework Al can not be removed largely. For HZSM 5(38) and HZSM 5(25), only 16% and 40% framework Al can be removed from framework respectively after steaming at 1073 K for 2 h. High vacuum IR spectra of pyridine adsorption reveal that the HZSM 5(38) zeolite after steaming at 1073 K for 2 h and noh framework Al removing contains a large number of L acid centre.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1996年第4期340-342,共3页
关键词
直接法
沸石
脱铝
水热处理
迁脱规律
分子筛
Direct method, HZSM 5 zeolite, Dealumination, Hydrothermal treatment
