Patent ID: 8628744

Claim:
A method of reducing carbon dioxide by a reverse water-gas shift reaction comprising: placing in a reactor a catalyst of formula (I): xM/Ln 2 O 2 SO y (I), in which M is a transition metal, a transition metal oxide, a Group VIII metal, a Group VIII metal oxide, a Group I metal, or a Group I metal oxide, or a combination of two to five thereat Ln is La, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, or a combination of two to four thereof; x is 0-30 wt % based on a total weight of the catalyst; y is 0 or 4; and feeding into the reactor a gaseous stream containing carbon dioxide and hydrogen so that the carbon dioxide is reduced with the hydrogen at a temperature of 100-800° C. to produce carbon monoxide and water.