CO2 methanation over Ni-7%Mo/AC catalyst

Title : CO2 methanation over Ni-7%Mo/AC catalyst

Abstract:

As a result of the significant increase in greenhouse gas emissions, technologies for the capture, utilization and storage of carbon dioxide are being implemented. Carbon dioxide (CO2) methanation has attracted considerable interest among potential carbon utilization strategies due to its ability to generate energy from non-fossil resources by using captured CO2. However, due to the extremely limited kinetics of CO2 methanation, the use of a catalyst is required to achieve the desired reaction efficiency. Due to their high availability and activity, nickel-based catalysts have become increasingly popular in recent years to catalyse the CO2 methanation process. The use of nickel-based catalysts requires a high activation energy of 92 kJ/mol for the reaction to proceed. This study investigated the effect of temperature over Ni-7%Mo/AC in the temperature range of 200 - 450 °C for CH4 production. The catalyst was synthesised using the incipient wetness impregnation method. The findings indicate that the maximum CO2 conversion and CH4 yield were achieved at a temperature of 350 °C with a total GHSV of 12000 h−1, and H2:CO2 ratio of 4:1 under atmospheric pressure. Therefore, the results demonstrate the potential of Ni-7%Mo/AC for CO2 methanation at low temperatures and atmospheric pressure.

Audience Take Away Notes:

• This study explores the utilization of Ni-7%Mo/AC catalysts for CO2 methanation, revealing optimal conditions for methane production at 350°C, GHSV of 12000 h−1, and H2 ratio of 4:1 under atmospheric pressure
• It provides crucial insights for engineers designing carbon capture systems, enhancing efficiency and reducing energy consumption
• Faculty can use these findings to expand research and teaching in catalysis and sustainable energy
• The research offers practical solutions to improve design accuracy and efficiency in CO2 conversion technologies
• Additionally, it contributes to ongoing efforts to mitigate greenhouse gas emissions by converting CO2 into methane

Biography:

Stephen Okiemute Akpasi, a chemical engineer, obtained his bachelor’s degree from Delta State University, Nigeria, and completed his master’s at Durban University of Technology, South Africa, focusing on developing adsorbents for carbon capture. Recently, he conducted research at the Institute of Sustainable Processes during an ERASMUS exchange program at the University of Valladolid, Spain, exploring the microbial conversion of CO2 to succinic acid via biogas upgrading. Currently pursuing a PhD in Chemical Engineering and Green Engineering Research at the Durban University of Technology, his research centres on synthesizing environmentally friendly catalytic materials. He has authored over 15 research articles in SCI(E) journals.