CO2/CO methanation over Ru and Ni supported γ-Al2O3: A study on the effect of the stoichiometry of reactant gases

• Published in: Molecular catalysis 2023-08, Vol.547, p.113365, Article 113365
• Main Authors: Jabotra, Ganesh, Yadav, Pradeep Kumar, Kumar, Siddharth, Sharma, Sudhanshu
• Format: Article
• Language: English
• Subjects: Biomass; Boudourad reaction, stability; CO2/CO methanation; Conversion; Gas hourly space velocity (GHSV); Sabatier reaction; Stoichiometry; Synthetic natural gas (SNG); Water-gas shift
• ISSN: 2468-8231; 2468-8231
• DOI: 10.1016/j.mcat.2023.113365

•Single step Hydrazine reduction method was used to prepare the Ni and Ru based catalysts.•Ru based catalyst shows the stable and high performance during the CO/CO2 methanation.•Here we observed the effect of the stoichiometry of reactant gases for both CO/CO2 methanation reaction over Ni and Ru based catalysts.•Deactivation was observed for the Ni based catalysts due to the CO disproportion or adsorption and formation of deactivating species. CO2 and CO conversion to methane serves as a dual process as it helps in the depletion of CO and CO2 released in the atmosphere due to anthropogenic reasons and gives us by-products of high calorific value. Herein, we have studied the CO2 and CO methanation reaction at different stoichiometry using two supported catalysts: Ru/γ-Al2O3 and Ni/γ-Al2O3. The catalysts are prepared using hydrazine reduction, and the methanation reaction is tested using temperature-programmed reactions by varying the stoichiometric moles of hydrogen to study the effect on conversion and methane selectivity. Stoichiometry effect is important to study in cases where hydrogen is present in lesser quantities than the stoichiometry. In addition, the long-term stability is also studied for both catalysts for 40 hours and spent catalysts were characterized by the Thermogravimetric analysis (TGA), O2-Temperature programmed oxidation (O2-TPO) and X-ray photoelectron spectroscopy (XPS). [Display omitted]