Dehydrogenation of Propane to Propylene in the Presence of CO2 over Steaming-treated HZSM-5 Supported ZnO

Dehydrogenation of propane to propylene over zinc oxide catalysts supported on steaming-treated HZSM-5 in the presence of CO2 has been investigated. The highest catalytic performance can be achieved on the 5%ZnO/HZSM-5(650) catalyst with the HZSM-5 support steaming at 650 degrees C, which allows the maximum propylene yields of 29.7% and 20.3% at the initial and steady states, respectively, in the catalytic dehydrogenation of propane at 600 degrees C. The superior catalytic performance of this catalyst can be attributed to high dispersion of ZnO and appropriate Br?nsted acidity of the HZSM-5(650) support. The catalytic stability is enhanced by the addition of CO2 to the feed gas due to the suppression of coke formation.