Catalytic Reduction of Carbon Dioxide with Simultaneous Aromatization of Propane on Metal-loaded HZSM-5 Catalysts.

Abstract

For the purpose of examining the possibility of performing reduction of carbon dioxide, and concurrently producing more value-added products from hydrocarbon, as a reducing agent, a reaction of carbon dioxide and propane on HZSM-5 catalysts containing Ga, Zn and Pt was conducted by using a continuous flow reaction apparatus. The catalytic test demonnstrated the possibility of conducting the reduction of carbon dioxide with simultaneous aromatization of propane on metal-loaded HZSM-5. Thus, carbon dioxide was reduced to carbon monoxide, and propane was converted into aromatics, mainly composed of benzene, toluene and xylene isomers, and lower alkenes generating by-products, such as methane and ethane. Among the catalysts examined in the present study, Zn-loaded HZSM-5 was most effective for the reduction of carbon dioxide by propane. It was also found that the introduction of carbon dioxide had some favorable effects on the aromatization of propane. Carbon dioxide suppressed catalyst deactivation caused by coke deposition and formation of by-product, ethane, to improve the selectivity of lower alkenes, such as ethene and propene.