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Novel Ni‐Ga alloy based catalyst for converting CO 2 to methanol
Author(s) -
Nguyen Hong Khanh Dieu,
Dang Toan Hong,
Nguyen Nga Le To,
Nguyen Ha Thi,
Dinh Ngo Thi
Publication year - 2018
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23006
Subject(s) - catalysis , thermogravimetric analysis , x ray photoelectron spectroscopy , methanol , alloy , selectivity , evaporation , desorption , materials science , stoichiometry , solvent , condensation , adsorption , chemical engineering , inorganic chemistry , analytical chemistry (journal) , chemistry , metallurgy , organic chemistry , physics , engineering , thermodynamics
Novel and advanced catalysts based on Ni‐Ga alloy were prepared through co‐condensation method with and without evaporation of water solvent for converting CO 2 to methanol. The co‐condensations used Ni(NO 3 ) 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 Ni 5 Ga 3 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 CO 2 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.