Title : Photoreduction of CO2 into CH3OH and CH4 using Bi2S3/CeO2 nanocatalyst
Abstract:
High utilization of fossil fuels causes global warming due to a dramatic increase of the carbon dioxide (CO2) level in the atmosphere. Thus, it becomes essential to explore new energy resources. Several ways have been explored to cope with these issues, such as utilization of carbon-free alternative energy sources, increase in efficiency of carbon-based energy systems and recycling of CO2. One economically feasible pathway is the photochemical conversion of CO2 into readily transportable and stable fuels, i.e., solar fuels (methane (CH4), methanol (CH3OH), and 1-butanol (C?H??O). Bi2S3 and CeO2, and Bi2S3/CeO2 nanocatalyst were produced under laboratory conditions. X-ray diffraction, high resolution transmission electron microscopy and scanning electron microscopy and UV/visible absorption spectroscopy and photoluminescence spectroscopy analysis were performed to determine and exhibits the physicochemical properties of Bi2S3/CeO2 nanocatalyst . Effects of Bi2S3 / CeO2 ratios (0,2, 0,4 and 0,6), Bi2S3/CeO2 nanocatalyst concentrations (0,2, 0,5, 0,7, 1,0 and 1,5 mg/l),photocatalytic contact time ( 5, 10, 15, 20 and 25 min), photoconversion power ( 0,5 , 1, 2, 5, 10 and 15 W/m2, temperature (15, 21, 30 and oC) and pH( 6, 7, 10) on the yields of CO2/ methane, CO2/ methanol, CO2/ butanol were studied. A cost analysis were performed for these studies.
