Dehydrogenation of ethane to ethylene on Pt/zincosilicate

Dehydrogenation of ethane to ethylene was investigated on Pt/MFI-type zincosilicate at 550 ºC using a fix-bed, continuous-flow reactor. The catalyst was characterized with XRD, nitrogen adsorption/desorption isotherm, TEM, X-ray absorption spectroscopy, NH3- and 2,6-dimethylpyridine-TPD. Conversion close to the equilibrium conversion with high ethylene selectivity > 99% was attained on 0.05%Pt/zincosilicate catalyst. The stability of catalyst was high with Pt/zincosilicate, however, deactivation was observed with Pt/aluminosilicate. Location of Pt was studied comparing NH3- and 2,6-dimethylpyridine-TPD, and it was revealed that Pt near the zeolite pore mouth was responsible for the high and stable catalytic performance of Pt/zincosilicate.