Novel Ni‐Ga alloy based catalyst for converting CO2 to methanol

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Abstract
Novel and advanced catalysts based on Ni‐Ga alloy were prepared through co‐condensation method with and without evaporation of water solvent for converting CO2 to methanol. The co‐condensations used Ni(NO3)2 and Ga metal as beginning precursors under alkaline media. Various Ni/Ga molar ratios and temperature of the co‐condensation‐evaporation method were investigated in order to obtain Ni5Ga3 alloy composition as active phase for the catalysts. The results confirmed that the stoichiometry of 5/3 could be reached at the same molar ratio of the beginning precursors, and the suitable temperature of the method was 80 °C for a certain time of 24 h. The Ni‐Ga based catalyst activity and selectivity were also tested in the conversion of CO2 to methanol at atmospheric pressure and 220 °C for different periods of time. The results showed that the catalyst was an excellent candidate for this process compared to other catalysts when exposing good selectivity over 90 % during long periods of time. Many techniques were used including X‐Ray Diffraction (XRD), Thermogravimetric Analysis (TGA), X‐Ray Photoelectron Spectroscopy (XPS), Nitrogen Adsorption–Desorption Analysis (BET), and Gas Chromatography (GC) to characterize the catalyst structure and the reaction performance, respectively.
Funding Information
  • National Foundation for Science and Technology Development (104.05-2017.21)

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