Preparation and eva‎luation of Copper based Nanostructured Catalysts in Reverse Water Gas Shift (RWGS) Reaction

9/18/2023 12:00:00 AM

Carbon dioxide can be considered as one of the most important greenhouse gasses in the atmosphere that can accelerate the global warming and climate change. The reverse water gas shift reaction is considered to be a highly attractive catalytic route for CO2 recycling in a future sustainable economy. Copper-based catalysts are commonly used for this reaction due to their high activity and selectivity. The first part of this research was related to the study of the MyOx (M=Al, La & Ce) prepared by the mechanochemical method, and was used as support for the preparation of 10% CuO/MyOx catalyst. Nanocrystalline CuO/Al2O3-CeO2(20) catalysts and promoted CuO-M/Al2O3-CeO2(20) (M = Mn, Cr, Mo) catalysts were employed a in reverse water gas shift reaction. The synthesized samples were characterized by XRD, BET, TPR and SEM techniques. Among the prepared copper catalysts 10% CuO/Al2O3-CeO2(20) catalyst showed high CO2 conversion (5.5%) and CO selectivity (100%) at 300℃. Even at high weight hourly space velocities (45,000 ml.gcat-1.h-1), observed no detectable deactivation after 7 hours of operation. The BET surface area of prepared CuO(10)/Al2O3-CeO2(20) was 179 (m2 g−1) and results indicated that the prepared powders possessed mesoporous structure with pores having small diameters with crystallite sizes in the nanometer range (2–10 nm). To improve the CO2 conversion and CO selectivity of 10% CuO/Al2O3-CeO2(20), 3 wt% Mn, Cr or Mo were used. CO2 conversion was increased during the reaction for CuO(10)-MnO2(3)/Al2O3-CeO2(20). 3% Mn increased CO2 conversion by about 2% and at 300 °C.

RWGS، تبديل CO2، كاتاليست مس، سنتز مكانيكي- شيميايي، اكسيد آلومينيوم، اكسيد سريم.

RWGS, CO2 Conversion, Mechanochemical synthesis, Copper catalyst, Al2O3, CeO2

mehrnaz sadeghnezhad

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