Effect of Ruthenium promotor ratio on Ni/Y2O3 Based Catalysts for CO2 Methanation Reaction

El-Salamony, Radwa Abass; El-Sharaky, Sara; El-Temtamy, Seham; Al-Sabagh, Ahmed; Killa, Hamada

doi:10.21608/ejchem.2021.51324.3072

Effect of Ruthenium promotor ratio on Ni/Y2O3 Based Catalysts for CO2 Methanation Reaction

Document Type : Review Articles

Authors

¹ process development, Egyptian petroleum research institute

² 1 Ahmed AlZomer street

³ Egyptian petroleum research institute, Nasr city, Cairo, Egypt

⁴ Department of Chemistry, Faculty of Science, Zagazig University, Zagazig

10.21608/ejchem.2021.51324.3072

Abstract

CO2 is one of the main contributors to the greenhouse effect and hence to climate change, there is a growing interest in its use as a feedstock in chemical processes. CO2 methanation has recently gained renewed interest. A series of nickel supported on yttrium oxide and promoted with different ratios of ruthenium was prepared by the wet impregnation method. The developed Ru-Ni/Y2O3 structure was then characterized using N2 adsorption-desorption isotherm, XRD, XPS, TPR, and HTEM techniques to evaluate the surface, crystal phase, and morphology. The catalytic test was conducted with the use of a fixed-bed tubular reactor under atmospheric pressure. Temperature of catalytic performance was 350 °C with a supply of CO2/H2/Ar with a ratio of 1/4/5 and a total flow rate of 200 ml/min. The main products of the reaction were CH4 and water. Traces of carbon monoxide was present among the product. The methane yield was reached 16.4%, 14%, 17.74%, and 14.24% over Ni/Y2O3, 1Ru-Ni/Y2O3, 5Ru-Ni/Y2O3, and 10Ru-Ni/Y2O3 catalysts respectively. The amount of promoter was stated to have affected the catalytic activity but huge numbers usually of promoters diminishing catalytic activity due to active site coverage. However; the increase in Ru loading in the 10Ru-Ni/Y2O3 sample decreased the catalytic activity towards methanation due to the Ru-precursor used (RuCl3.nH2O) in this study. The residual chloride ions form a barrier between the support and the metal, and thus both inhibit CO and hydrogen chemisorption on the catalyst surface.

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