Title: CONVERSION OF CO2 INTO METHANOL USING NOBLE METAL CATALYSTS
Abstract: Conversion of CO2 into Methanol using Noble Metal Catalysts Carbon dioxide is one of the most abundantly available resource of C1 in nature with an enormous potential of being used as a low-cost feedstock in the synthesis of a large variety of valuable industrial chemicals. Conversion of carbon dioxide into methanol, DME, alcohols and olefins has evolved as an active scientific area in recent years for effective utilization of carbon dioxide as a feedstock. Methanol synthesis from CO2 hydrogenation (provided that the hydrogen is supplied from renewable sources) is considered most reasonable strategy for CO2 utilization. We designed different sets of catalysts using noble metals supported on metal oxides (such as CeO2 and ZrO2) and evaluated their catalytic performance for CO2 hydrogenation reaction to produce methanol. Catalysts were thoroughly characterized using a range of characterization techniques (such as BET, XRD, CO2-TPD, CO-chemisorption, H2-TPR, XPS and HR-TEM). A comprehensive in situ DRIFT spectroscopy investigation was also carried out for the prepared catalysts to investigate the evolution of intermediate species emerged on the catalyst surface at actual reaction conditions of methanol synthesis from CO2 hydrogenation reaction. Results showed that prepared catalysts were very active and highly selective (~100 % Selectivity in the case of PdZn/CeO2, CaPdZn/CeO2 and CaPdZn/ZrO2) to methanol synthesis from CO2 hydrogenation under moderate reaction conditions (P = 30 bar, T = 220 oC) with more than 7% CO2 conversion and exhibited excellent stability and catalyst life time. Based on the evidence obtained from DRIFTS, reaction mechanisms were also proposed for different sets of catalysts. Surface species emerged over the surface of catalysts showed that overall reaction may follow the formate route for methanol synthesis.
Publication Year: 2019
Publication Date: 2019-01-01
Language: en
Type: article
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