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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.44 [2006] >
IJPAP Vol.44(02) [February 2006] >
| Title: | Disproportionation of 1,2,4-trimethylbenzene over bifunctional bimetallic catalysts |
| Authors: | Bhavani, A Geetha
Karthikeyan, D
Lingappan, N
Rao, A Sreenivasa |
| Keywords: | Disproportionation
1,2,4-trimetylbenzene
Nickel
Platinum
Zeolite-β
Mordenite |
| Issue Date: | Feb-2006 |
| Publisher: | CSIR |
| IPC Code: | B82B3/00 |
| Abstract: | Zeolite-β and mordenite have been
impregnated with 0.1 wt.% Pt and varying (0, 0.1, 0.3, 0.5 wt.%) amounts of Ni
and reduced at 475 ºC. The line broadening XRD analysis indicates that the
increasing Ni addition decreases the crystallinity of zeolites. The TEM
analysis indicates that the average metal particle size increases with
increasing Ni addition. The states of Ni and Pt have been analyzed by ESCA. The
acidity measurements by pyridine adsorbed FTIR spectroscopy show the occupation
of some of the acid sites by the added Ni species. Disproportionation of
1,2,4-trimethylbenzene was carried out in the temperature range 250-400 ºC and
found that Ni addition up to 0.3 wt.% over 0.1 wt.% Pt/H-β and 0.1 wt.% over
0.1 wt.% Pt/H-MOR enhances the 1,2,4-trimetylbenzene conversion and
disproportionation selectivity of the catalysts. Further, Ni addition above the
threshold value leads to fall in activity and disproportionation selectivity
drastically. Zeolite-β based Ni-Pt catalysts always show higher activity and
selectivity than mordenite based catalysts. |
| Page(s): | 177-182 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.44(02) [February 2006]
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