HZSM-5分子筛上吸附苯和甲醇的TPSR-MS研究  

TPSR-MS study of adsorbed benzene and methanol over HZSM-5 zeolites

作　　者：孙仁山[1] 黄星亮[1] 詹德鼎 字琴 龚艳[1] 张鑫[1] 曹中扬 

机构地区：[1]中国石油大学(北京)化学工程学院,北京102249 [2]中国石油大港油田天然气公司,天津300280

出　　处：《工业催化》2017年第10期20-26,共7页Industrial Catalysis

基　　金：国家自然科学基金资助项目(21576288)

摘　　要：对不同硅铝比HZSM-5分子筛进行程序升温表面反应-质谱(TPSR-MS)实验和原位程序升温氧化(TPO)。结果表明,苯在HZSM-5分子筛上于60℃下吸附后程序升温脱附的过程中检测到乙烯,硅铝比越低,检测到的乙烯越多,HZSM-5分子筛上的残碳量越大。甲醇在HZSM-5分子筛上于60℃下吸附后程序升温脱附的过程中检测到甲苯,但未检测到苯,硅铝比越低,检测到的甲苯量越大;同时检测到氢气,硅铝比越低,氢气量越小,TPO检测到的残炭量越小。吸附温度越高,甲醇越易转化成甲苯。Temperature programmed surface reaction mass spectrometry （TPSR -MS） experiments and temperature programmed oxidation（TPO） were conducted on HZSM- 5 zeolites of different ratios of silica to alumina. The results showed that ethylene was detected during temperature programmed desorption（TPD） after benzene was adsorbed on HZSM -5 at 60 ℃, and the lower the ratios of silica to alumina was, the more ethylene was detected, and the more carbon residue over HZSM -5 zeolite was. Toluene was discov- ered during TPD after methanol was adsorbed on HZSM -5 zeolite at 60 ℃, but benzene was not detec- ted, and the amount of toluene increased with the reduction of silica to alumina ratio. Simultaneously, hydrogen was detected, and with the decrease of silica/alumina ratio, the amount of hydrogen and carbon residue tested by TPO decreased. The higher the adsorption temperature, the more easily methanol was converted to toluene.

关 键 词：催化化学 HZSM-5 苯 甲醇 程序升温表面反应 

分 类 号：O643.36[理学—物理化学] TQ424.25[理学—化学]