Direct synthesys of LPG from co2 by using CZZA and HY zeolite hybrid catalyst

Abstract

CO2 conversion to lower hydrocarbons (HCs) is a high-potential method that can significantly reduce and manage this greenhouse gas in the long term. Liquefied petroleum gas (LPG) is widely utilized in transportation. Furthermore, biomass appears to be more attractive for decreasing CO2 emissions through conversion to liquid transportation fuels, as it is a renewable and sustainable energy source. The objectives of this work were to examine the direct synthesis of LPG from CO2 hydrogenation using a mixed metal catalyst composed of copper, zinc oxide, zirconium, and alumina (CZZA), and an HY zeolite as a hybrid catalyst. The study tested four production conditions in a fixed bed reactor with hydrogen/CO2/carbon monoxide as the reactant gas. The mixing between the CZZA and HY zeolite catalysts had a major impact on the HCs selectivity, significantly suppressing the reverse water gas shift reaction. A CO2 conversion rate of 27.39 % was obtained at optimal conditions, along with high selectivity for HC (98.70 %) and LPG (66.56 %). The second part involved a pilot horizontal gasifier to evaluate the Biomass to Liquids Process (BTL). Due to the gasifier's temperature stability at 900 °C, the H2/CO molar ratio remained constant between 1.75 and 2.25. Syngas was converted to liquid fuels at a conversion of 28.56 % in FT synthesis which was caried out at 280 °C and 2 MPa.