01795nas a2200181   4500008004100000022001400041245010900055210006900164260000800233300001600241490000700257520114000264100001801404700001801422700002301440700002301463856012701486       2025                        eng d  a0887-062400aHydrogenation of CO2 catalyzed by thermally decomposed cobalt-containing alkaline earth metal carbonates0 aHydrogenation of CO2 catalyzed by thermally decomposed cobaltcon  cJUN  a12982-129910 v393 a<p>
	CO2 hydrogenation over Co catalysts supported on alkaline earth metal oxides was investigated. The catalysts were prepared by thermally decomposing alkaline metal carbonates CoMCO3, where M = Mg, Ca, Sr, and Ba, in H2. During the thermal activation, contingent upon the thermal stability of the precursor, it transformed into a composite of metal oxides, metals, and undecomposed metal carbonates. The thermal activation temperature, the ratio of CO2 to H2, the composition, and the basicity of the catalyst all played a significant role in influencing the conversion of CO2 and the selectivity to CH4. Among the various Co-containing alkaline earth metal carbonate precursors, CoCaCO3 activated at 400 degrees C yielded the highest steady-state CO2 conversion of 54% with a CH4 selectivity of 89.8% throughout 28 h in the reaction stream containing a 1:4 ratio of CO2 and H2. Detailed characterization showed that the CaCo-400 catalyst contained metallic Co, CaO, and undecomposed CaCO3 phases. The study assumes significance in understanding the role of the composition of catalysts in the formation of CO2 hydrogenation.</p>
1 aGupta, Sharad1 aVinod, C., P.1 aPoupin, Christophe1 aJagadeesan, Dinesh  uhttps://library.ncl.res.in/content/hydrogenation-co2-catalyzed-thermally-decomposed-cobalt-containing-alkaline-earth-metal