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Citation: He Jing, Li Xuan-Wen, Liu Xing-Yun, Pei Zhan-Fen, She Li-Qin. Properties of Y Zeolite Dealuminated by Oxalic Acid[J]. Acta Physico-Chimica Sinica, ;1997, 13(06): 554-559. doi: 10.3866/PKU.WHXB19970614 shu

Properties of Y Zeolite Dealuminated by Oxalic Acid

1.
College of Chemistry and molecular Engineering,Peking University,Beijing 100871

Received Date: 6 November 1996
Available Online: 15 June 1997

The Y zeolite dealumiated by oxalic acid and ammonium oxalate maintained the faujasite structure with a od 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 N2 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.
- Dealuminated Y zeolite,
- Aluminum vacancy,
- Secondary pores,
- Chemical dealuminization
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