Abstract:2O3system to optimize the catalyst of the hydrogenationof CO2to methanol. Using hydrothermal method, layered double hydroxides (LDHs) [Co2+1-xIn3+x(OH)2]x+[Ax/n]n-were used as precursors to synthesize InxCo1-xOycatalyst with different In/Co molarratios. The catalytic performance of CO2hydrogenation was systematically tested, and the structure andsurface chemical properties were characterized. The influence of LDHs precursors on the structure andthe structure-activity relationship of the prepared catalyst were discussed. The results show that the cat⁃alyst with LDHs precursors can effectively inhibit the formation of CH4by-product. Even at low GHSVor high temperature, the CH4selectivity is still lower than 1%. Catalyst In0.25Co0.75Oyshows the bestcatalytic performance of CO2hydrogenation to methanol. Under the reaction conditions of P=5.0 MPa,T=300 ℃, H2∶ CO2=3 ∶ 1,GHSV=9 000 cm3/(gcat·h), a methanol yield of 3.75 mmolCH3OH/(gcat·h) was achieved. Close-