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http://nopr.niscpr.res.in/handle/123456789/32131| Title: | Synthesis of xylene over cerium modified large pore zeolite: A kinetic study |
| Authors: | Thakur, Ruchika Barman, Sanghamitra Gupta, Raj Kumar |
| Keywords: | Beta zeolite;Cerium;Kinetic modeling;Transalkylation;Xylene |
| Issue Date: | Sep-2014 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Synthesis of xylene by transalkylation of 1, 2, 4 trimethylbenzene with toluene over cerium modified beta zeolite has been investigated in the present study. The reaction has been carried out in a fixed bed down-flow reactor. The effect of various process parameters: temperature (623-723K), reactant ratio (0.5-4) and space time (0.88-2.9 kg h/kmol), on the toluene conversion and xylene selectivity are investigated. Zeolites with different amount of cerium loading (4.12 wt%, 6.54 wt%, 8.1 wt% and 10.34 wt%) have been prepared and characterized. Zeolite having 8.1wt% cerium loading is proved to be the most active catalyst. Maximum toluene conversion of 58.77% is achieved at a temperature-698K, reactant ratio–3:1, space time-2.9 kg h/kmol. The kinetic runs have been carried out to choose the zone in which the mass transfer effects are negligible. Based on product distribution, a mechanism for the formation of xylene over the modified catalyst is proposed along with a rate expression. The kinetic and adsorption constants of the rate equations are estimated by non-linear regression. The activation energy is found to be 122.41 kJ/mol which compares well with those reported in the literature for transalkylation reaction over similar catalysts. |
| Page(s): | 379-385 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Appears in Collections: | IJCT Vol.21(5-6) [September-November 2014] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCT 21(5-6) 379-385.pdf | 165.94 kB | Adobe PDF | View/Open |
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