Catalyst for preparing synthesis gas from natural gas and carbon dioxide, and preparation method thereof

A method for preparing synthesis gas, comprising:

• carrying out a combined reforming process of steam and carbon dioxide reforming of natural gas, which reforms natural gas with steam and carbon dioxide simultaneously, on a catalyst obtained by reducing a catalyst for natural gas reforming which reforms natural gas with steam and carbon dioxide simultaneously with hydrogen gas at a temperature of 700-1000° C., under the conditions of a reaction temperature of 850-1000° C., reaction pressure of 0.5-20 atm, space velocity of 1,000-500,000 h−1, and a molar ratio of CH4/H2O/CO2 of 1/1.0-2.0/0.3-0.6,
• wherein the catalyst comprises Ce/MgAlOx or Ce-Zr/MgAlOx, as a carrier comprising 3-20 wt % based on the carrier of Ce or Ce-Zr, respectively, carried on the MgAlOx having the weight ratio of MgO/Al2O3 within the range of 3/7 to 7/3;
• and Ni, as an active ingredient, supported on the Ce/MgAlOx or Ce-Zr/MgAlOx carrier in an amount of 5-20 wt % based on the carrier, and has a specific surface area of 80-200 m2/g after calcining at a temperature of 600-1000° C.;
• wherein the combined reforming process provides a CH4 conversion and CO2 conversion maintained at 80% or higher and 45% or higher, respectively, and a molar ratio of H2(2CO+3CO2) is maintained at 0.85-1.15.