| 초록 |
In propane dehydrogenation (PDH), side reaction occur on the catalyst surface leading to the coke deposed and declining activity during reaction. This study investigate the effect of H2 ratio, various H2 (0, 10, 20 & 30 mL/min, total feed 100 mL/ min and balancing with N2 to Pt (3wt%)-Sn (2wt%)/ Al2O3 on the catalytic propane dehydrogenation, the amount of coke deposed on the surface catalyst and kinetic parameters of coke combustion modelling by thermogravimetry. We found that hydrogen ratio, H2 has positive effect in deactivation (PDH) reaction, and hydrogen flow prevent coke on the catalyst surface and decrece the deactivation of catalyst. In different hydrogen ratio the propane conversion and propylene selectivity, was different and the highest conversion and selectivity was in 10ml/min. The coke combustion Ea of spend [3w%Pt -2w%Sn] catalyst were 116.50KJmol-1 (without H2), 191.50KJmol-1 (H2= 10ml min-1), 225KJmol-1 (H2=20ml min-1). As well as pre- exponential factor respectively were 8.97x102 min-1 (H2=0ml min-1), 3,5x103 min-1 (H2=10ml min-1), 5,59x105 (H2=20ml min-1)…. |
