Patent ID: 8729141

Claim:
A method for preparing methanol from carbon dioxide, comprising: preparing synthesis gas having H 2 /(2CO+3CO 2 ) mole ratio of 0.85˜1.15 via combined reforming, in which steam reforming of natural gas is carried out simultaneously with carbon dioxide reforming of methane, in the presence of a catalyst of Ni/Ce/MgAlO x or Ni/Ce—Zr/MgAlO x , wherein said preparing synthesis gas is performed by carrying out combined reforming at a reaction temperature of 800 to 1,000° C. under a reaction pressure of 05˜20 atm with a space velocity of 1,000 to 500,000 h −1 in such a condition that molar ratio of CH 4 /CO 2 /H 2 O is within a range of 1/0.3-0.6/1.0-2.0; synthesizing methanol from the obtained synthesis gas in the presence of a catalyst of Cu—ZnO—Al 2 O 3 /CeZrOx; and separating the methanol product from unreacted synthesis gas and recycling 10 the unreacted synthesis gas.