Choudhary, V. R. ; Kinage, A. K. ; Sivadinarayana, C. ; Guisnet, M. (1996) Influence of O2 and H2 pretreatments on acidity/acid strength distribution and acid functions of Ga/H-ZSM-5, H-GaMFI and H-GaAl MFI zeolites Journal of Chemical Sciences, 108 (2). pp. 89-100. ISSN 0974-3626
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Official URL: http://www.ias.ac.in/j_archive/chemsci/108/vol108c...
Related URL: http://dx.doi.org/10.1007/BF02872523
Abstract
H-gallosilicate (H-GaMFI), H-galloaluminosilicate (H-GaAlMFI) and Ga, impregnated H-ZSM-5 (Ga/H-ZSM-5) zeolites pretreated with O2 and H2 (at 600° C for 10 h) have been characterized for their acidity/acid strength distribution (by chemisorption and stepwise thermal desorption of pyridine from 100° -400° C) and also for their acid functions by acid catalysed reactions [viz. isooctane cracking (at 400°C) (for characterizing external acid sites) and toluene disproportionation (at 500° C) and methanol-to-aromatics conversion (400°C)] using a pulse microreactor. The catalysts were also characterized by XPS,29Si,27Al and71Ga MAS NMR. The acidity/acid strength distribution, activity in the acid catalyzed reactions, frame-work Si/Ga ratio and surface Ga/Si ratio of the zeolites are significantly affected by their pretreatment by O2 or H2.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Indian Academy of Sciences. |
| Keywords: | Acid Catalysed Reactions; H-gallosilicate MFI; H-galloaluminosilicate MFI; Ga-impregnated H-ZSM-5; Acidity of Zeolites; Acid Catalysed Reactions; O2 and H2 Pretreatments |
| ID Code: | 88503 |
| Deposited On: | 29 Mar 2012 04:32 |
| Last Modified: | 03 Apr 2012 05:06 |
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