▎ 摘　　要

NOVELTY - A catalyst comprises component (A) comprising metal oxide as active material and component (B) comprising molecular sieve with LEV topology. The metal oxide is one or more of manganese oxide, manganese chromium oxide, manganese aluminum oxide, manganese zirconium oxide, manganese indium oxide, zinc oxide, zinc chromium oxide, zinc aluminum oxide, zinc gallium oxide, zinc indium oxide, cerium dioxide, gallium trioxide, indium trioxide, zinc-aluminum-manganese oxide and indium-gallium-manganese oxide. The specific surface area of manganese oxide, zinc oxide, cerium dioxide, gallium trioxide and indium trioxide is 1-100 m2/g, and the specific surface area of manganese chromium oxide, manganese aluminum oxide, manganese zirconium oxide, manganese indium oxide, zinc chromium oxide, zinc aluminum oxide, zinc-aluminum-manganese oxide and indium-gallium-manganese oxide is 5-150 m2/g. USE - Catalyst used for direct conversion of synthesis gas to produce low-carbon olefins (claimed). ADVANTAGE - The catalyst can be effectively used in direct conversion of synthesis gas to produce olefin with high yield, high 2C and 3C selectivity and low by-product methane selectivity. DETAILED DESCRIPTION - A catalyst comprises component (A) comprising metal oxide as active material and component (B) comprising molecular sieve with LEV topology. The metal oxide is one or more of manganese oxide (MnOx), manganese chromium oxide (MnCryO(x+1.5y)), manganese aluminum oxide (MnAlyO(x+1.5y)), manganese zirconium oxide (MnZryO(x+2y)), manganese indium oxide (MnInyO(x+1.5y)), zinc oxide, zinc chromium oxide (ZnCryO(x+1.5y)), zinc aluminum oxide (ZnAlyO(1+1.5y)), zinc gallium oxide (ZnGayO(1+1.5y)), zinc indium oxide (ZnInyO(2+1.5y)), cerium dioxide, gallium trioxide, indium trioxide, zinc-aluminum-manganese oxide (ZnyAlzMnO(x+1.5y+1.5z)) and indium-gallium-manganese oxide (InyGazMnO(x+1.5y+1.5z)). The specific surface area of manganese oxide, zinc oxide, cerium dioxide, gallium trioxide and indium trioxide is 1-100 m2/g, and the specific surface area of manganese chromium oxide, manganese aluminum oxide, manganese zirconium oxide, manganese indium oxide, zinc chromium oxide, zinc aluminum oxide, zinc-aluminum-manganese oxide and indium-gallium-manganese oxide is 5-150 m2/g. x = 1-3.5; y = 0.1-10;and z = 0.1-10. An INDEPENDENT CLAIM is included for method for directly converting synthesis gas to produce low-carbon olefins, which involves using the synthesis gas as the reaction raw material to carry out the conversion reaction on fixed bed or moving bed comprising the catalyst.