Catalytic hydrogenation of co2 over cu zno sba-15 catalysts for production of methanol
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Date
2016-02-01
Authors
Sahrizul Aman Asri
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Abstract
Global warming issues had been widely become main concern worldwide. The
main cause of the global warming is due to increasing amount of the greenhouse gases in the atmosphere especially carbon dioxide (CO2) gas. The production of methanol from CO2 considered as the alternative to the costly geological and oceanic CO2 sequestration. Cu/ZnO based catalyst had been reported to be active for the production of the methanol from CO2 hydrogenation. For this study, the main objective was to synthesized high activity of Cu/ZnO/SBA-15 for hydrogenation of CO2 to produce methanol. SBA-15 support was synthesized using conventional method without the hydrothermal aging and the Cu/ZnO metal was loaded on the support using deposition co-precipitation method. The characterizations been carried out on the synthesized SBA-15 and catalyst Cu/ZnO/SBA-15. The prepared SBA-15 having fibre like morphology with BET surface area, micropore area, mesopore area and pore volume of 716.98 m2/g, 188.32 m2/g, 528 m2/g and 0.70 cm3/g, respectively. The Cu/ZnO/SBA-15 with Cu:ZnO:SBA-15 ratio 3:4:6 (23.1 wt% Cu) was selected as the best catalyst for this studies and used for the process studies. The best reaction condition was at total gas hourly space velocity (GHSV) of 3600 h-1, temperature 543 K and pressure 5.0 MPa with conversion of CO2 at 22% with methanol yield of 17.0%.The activation energy for the production of methanol from CO2 hydrogenation was determined from Arrhenius plot and the estimated activation energy was 43 kJ/mol.