| Title | 草酸脱铝Y沸石的性质 |
| Other Titles | Properties of Y Zeolite Dealuminated by Oxalic Acid |
| Authors | 何静 李宣文 刘兴云 裴站芬 佘励勤 |
| Affiliation | 开云app体育 化学与分子工程学院!北京 100871 北京化工大学 |
| Keywords | 缺铝Y沸石 骨架铝空位 结构二次孔 化学脱铝 Dealuminated Y zeolite Aluminum vacancy Secondary pores Chemical dealuminization |
| Issue Date | 1997 |
| Publisher | 物理化学学报 |
| Citation | 物理化学学报.1997,(06),554-559. |
| Abstract | 草酸与草酸铵脱铝的Y沸石，具有八面沸石结构和良好的结晶度．羟基红外光谱和吡啶吸附的红外光谱表明，在脱铝Y沸石的骨架中存在着铝空位．这种块铝Y沸石中由3550cm-1表征的小笼羟基更具开放性，但稳定性较差，在升温过程中，它比3640cm－1表征的大笼羟基更易脱除．吡啶与CO双探针分子红外光谱的研究表明，升温脱羟基过程伴随着与Lewis酸有关的非骨架铝的生成．低温N2吸附的结果显示，缺铝Y沸石中还有远远大于铝空位的二次孔存在，这可能是升温过程中结构重排造成的。 The Y zeolite dealuminated by oxalic acid and ammonium oxalate maintained the faujasite structure with a good crystallinity. The OH-IR spectra and chemical analysis showed that there were aluminum vacancies in the framework of the dealuminated Y zeolite. In such a dealuminated Y zeolite, the hydroxyls represented by 3550cm(-1) was accessible to pyridine, while not so stable as the hydroxyls represented by 3640cm(-1) when they were heated in vacuum. The IR spectra of double probes of Pyridine and CO illustrate the production of extra-framework aluminum species which are related to Lewis acid sites in the process of dehydroxylation. The results of N-2 adsorption at low temperature suggest the existence of secondary pores which are much larger than the aluminum vacancies, and this probably resulted from the structure reconstruction. |
| URI | http://hdl.handle.net/20.500.11897/78952 |
| ISSN | 1000-6818 |
| DOI | 10.3866/PKU.WHXB19970614 |
| Indexed | SCI(E) 中文核心期刊要目总览(PKU) 中国科学引文数据库(CSCD) |
| Appears in Collections: | å å¦ä¸ å å å·¥ç¨ å¦é ¢ |
