US EPA

858227 

Journal Article 

Disproportionation of 1,2,4-trimethylbenzene over bifunctional bimetallic catalysts 

Bhavani, AG; Karthikeyan, D; Lingappan, N; Rao, AS 

2006 

Yes 

Indian Journal of Pure and Applied Physics
ISSN: 0019-5596 

44 

2 

177-182 

English 

WOS:000235676100019 

Zeolite-beta 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 degrees C. 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 degrees C and found that Ni addition up to 0.3 wt.% over 0.1 wt.% Pt/H-beta 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-beta based Ni-Pt catalysts always show higher activity and selectivity than mordenite based catalysts. 

disproportionation; 1,2,4-trimetylhenzene; nickel; platinum; zeolite-beta; mordenite