Intrinsic Kinetics Study of LPDME Process from Syngas over Bi-functional Catalyst

The intrinsic kinetics of the three phase dimethyl ether (DME) synthesis from syngas over a bi- functional catalyst has been investigated in a agitated slurry reactor at 20-50 bar, 200-240 o C and H2/CO feed ratio from 1 to 2 .The bi-functional catalyst was prepared by physical mixing of CuO/ZnO/Al2O3 as methanol synthesis catalyst and H-ZSM-5 as methanol dehydration catalyst. The three reaction including methanol synthesis from CO and H2, methanol dehydration and water-gas shift reaction were chosen as the independent reaction. A kinetic model for the combined methanol + DME synthesis based on a methanol synthesis model proposed by Graaf (1988) and a methanol dehydration model by Bercic and Levec (1992) has been fit our experimental data. Coefficients in the equations follow the Arrhenius and the Van’t Hoff relation. The calculated apparent activation energy of methanol synthesis reaction and methanol dehydration reaction are 115kJ/mol and 82kJ/mol, respectively.

کلیدواژه ها:

Dimethyl Ether ، Syngas ، Bi-functional Catalyst ، slurry reactor ، Kinetics model