Carbon dioxide hydrogenation catalyst

A method of hydrogenating carbon dioxide, the method comprising:

• providing a CO2 hydrogenation catalyst comprising an alkali-metal enriched bauxite residue comprising CaCO3, Fe2O3, FeO(OH), Al(OH)3, sodalite, muscovite, Na5Al2CSi3O15, and potassium, wherein the potassium is present in the CO2 hydrogenation catalyst at from 3 wt. % to 5 wt. % potassium based on a total weight of the CO2 hydrogenation catalyst by ICP-OES;
• combining particles of the CO2 hydrogenation catalyst and a gaseous mixture of CO2 and H2 in a reactor;
• and
• reacting at least a portion of the CO2 and H2 in the gaseous mixture in the presence of the CO2 hydrogenation catalyst at a temperature of 200 to 550° C. to form a hydrocarbon mixture comprising a C2-C4 olefin;
• wherein the CO2 hydrogenation catalyst has a surface area of 11 to 16 m2/g;
• wherein the CO2 hydrogenation catalyst has a pore volume of 0.015 to 0.025 cm3/g;
• wherein the CO2 hydrogenation catalyst has a hydrogen temperature-programmed reduction (H2-TPR) of from 400 to 450 micromoles per gram (mol) at a temperature of 200 to 850° C.;
• wherein the method has a CO2 conversion of from 25% to 30% based on a total number of moles of CO, introduced;
• and
• wherein the method has a C2-C4 olefin selectivity of from 20% to 30%.