首页|Catalytic process development strategies for conversion of propane to liquid hydrocarbons
Catalytic process development strategies for conversion of propane to liquid hydrocarbons
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The temperature effect on propane dehydroaromatization pathways on the PtZn/SiO2 +ZSM-5 bifunctional catalysts is investigated to develop strategies for propane conversion to valuable liquid hydrocarbons.At high temperature(550 ℃),high dehydrogenation rates and lower monomolecular cracking rates are required to minimize methane formation,leading to primarily propene and BTX(benzene,toluene,and xylenes).By recycling propene in the propane conversion range of 30-45%,>80% BTX yields is likely achievable at full recycle.At mid temperature(400-450 ℃),the product has high selectivity to gasoline-blending hydrocarbons(butanes,C_5~+ hydrocarbons,toluene,and xylenes)at 15-25% propane conversions because dehydrogenation rates are moderately high,and oligomerization is more favored than cracking.At low temperature(350 ℃),~25% propane conversion is achieved and has high selectivity(~60%)to butanes,but the propane conversion rates are likely too low to be practical.While methane formation by monomolecular cracking limits liquid yields at high reaction temperature,hydrogen co-produced at high propane conversions saturates light olefins to make un-desired ethane,which becomes major yield loss reaction on the PtZn/SiO2 +ZSM-5 at mid and low temperatures.
Propane dehydroaromatizationBifunctional catalystPlatinum-zinc alloyShale gasCyclar process
Che-Wei Chang、Jeffrey T.Miller
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Davidson School of Chemical Engineering,Purdue University,480 Stadium Mall Drive,West Lafayette,IND 47907,United States
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