(730i) Selective Conversion of CO2 to CO at Low Temperatures Using Cu and Ni Catalysts Prepared By Combustion Synthesis Technique

Utilization of fossil fuels accounts for a large portion of the total energy required resulting in an exponential growth in CO₂ emission into the atmosphere. In this regard, the Carbon Capture and Utilization (CCU) strategy, a catalytic conversion of CO₂ into CO through reverse water gas shift (RWGS) reaction can be considered an attractive approach to CO₂ valorization. Herein, we investigate Cu and Ni-based catalysts prepared by the combustion synthesis method for RWGS reaction. The CO₂ thermal hydrogenation reaction was carried out successfully using a tubular flow reactor in the temperature range of 100 to 600 ^oC with a CO₂/H₂ ratio of 1 to 4. The catalysts showed ~70% conversion at 600 ^oC stable for 17h [1,2]. The copper catalysts show exceptional selectivity for CO, even at low temperature, whereas addition of nickel results in better activity with a slight trade off in CO selectivity to CH₄. We also employed electrocatalytic routes to convert CO₂ on Cu, Ni electrocatalysts to understand the reaction pathway [3-6]. The catalysts (both fresh and used ones) were characterized by different techniques such as: XRD, TPR and SEM/EDX, TEM, and Raman; to study the morphological properties as well as the impact of reaction exposure on the catalysts.

References:

[1] Mohammed AAA, Saad MAHS, Kumar A, Al‐Marri MJ.; Greenh Gases Sci Technol 2020;10:715–24.

[2] Kumar A, Mohammed AAA, Saad MAHS, Al‐Marri MJ.; Int J Energy Res 2021:er.6586.https://doi.org/10.1002/er.6586.

[3] Nazir R, Khalfani A, Abdelfattah O, Kumar A, Saleh Saad MA, Ali S.; Langmuir 2020;36:12760-12771

[4] Nazir R, Kumar A, Ali Saleh Saad M, Ali S.; J Colloid Interface Sci 2020;578:726–37.

[5] Nazir R, Kumar A, Saleh Saad MA, Ashok A.;Colloids Surfaces A Physicochem Eng Asp 2020;598:124835.

[6] Nazir R, Kumar A, Ali S, Saad MAS, Al-Marri MJ.; Catalysts 2019;9:860