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http://nopr.niscpr.res.in/handle/123456789/30999| Title: | Influence of preparative conditions on the structure, acidity and catalytic activity of dealuminated Y zeolite |
| Authors: | Kumari, V Durga Prasad, B Prabhu Rao, V Venkat |
| Issue Date: | Mar-1996 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Deammoniation ofNH4Y (NH4Y → HY + NH3) followed by partial dehydroxylation of HY removed part of the aluminium from zeolitic framework and most of this non-framework aluminium is conveniently extracted with ethanolic solutions of acetylacetone. A seriesof dealuminated Y zeolite is prepared by this method varying the Si/Al ratio. These dealuminated Y zeolites are characterized by chemical analysis, XRD, BET surface area, acidity, IR, TPD of ammonia and catalytic activity in acid catalyzed reactions like cumene cracking , aniline alkylation, phenol alkylation and cyclohexanol dehydration. Shift of 1010cm-1 frequency in IR spectra to 1068cm-1 and decrease in unit cell parameter ao from 24.74(Na Y) to 24.32 (DHY24) (A) have demonstrated NAI /U.C.≃ 12 ,a state of advanced dealumination. TPD of ammonia and catalytic activity over these dealuminated Y zeolites clearly show the presence of weak-moderate-strong acidity. |
| Page(s): | 95-100 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Appears in Collections: | IJCT Vol.03(2) [March 1996] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCT 3(2) 95-100.pdf | 518.48 kB | Adobe PDF | View/Open |
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