▎ 摘　　要

NOVELTY - Composite catalyst comprises component I and component II. The active ingredient of component I is metal oxide, and component II is molecular sieve coated with silicon dioxide (SiO2) on the surface. The mixing manner of the component I and the component II is mechanical mixing or sub-bed filling, and according to the flow direction of the raw material, the component II is placed downstream of the component I. The molecular sieves in component II are molecular sieves with MFI, FER, MWW, and/or MEL topological structures. The molecular sieve has the characteristics of medium strong acid, and the amount of medium strong acid sites is 0.005-2.5 mol/kg. The method of surface coating SiO2is silane or siloxane treatment, or layer of all-silicon molecular sieve is grown on the surface of molecular sieve, or the method of coating SiO2is adopted. The method for growing one layer of all-silicon molecular sieve is hydrothermal method. USE - The composite catalyst is useful in direct conversion of synthesis gas to gasoline (claimed). ADVANTAGE - The composite catalyst has very excellent catalytic stability in the synthesis gas to gasoline reaction. DETAILED DESCRIPTION - Composite catalyst comprises component I and component II. The active ingredient of component I is metal oxide, and component II is amolecular sieve coated with silicon dioxide (SiO2) on the surface. The mixing manner of the component I and the component II is mechanical mixing or sub-bed filling, and according to the flow direction of the raw material, the component II is placed downstream of the component I. The metal oxide in component I is manganese oxide compound of formula MnOy(I), manganese chromium oxide compound of formula MnCrxOy(II), manganese aluminum oxide compound of formula MnAlxOy(III), manganese zirconium oxide compound of formula MnZrxOy(IV), manganese indium oxide compound of formula MnInxOy(V), zinc manganese oxide compound of formula ZnMnxOy (VI), zinc chromium oxide compound of formula ZnCrxOy(VII), zinc aluminum oxide compound of formula ZnAlxOy (VIII), zinc chromium compound of formula ZnCrx(IX), AlzOy(X), ZnGaxOy(XII), zinc oxide (ZnO), cesium oxide (CeO2), zinc gallium aluminum oxide compound of formula ZnGaxAlzOy (XIII), Indium (III) oxide (In2O3), zinc indium oxide compound of formula ZnInxOy (XIV), cesium zirconium oxide compound of formula CeZrxOy ((XV)), cobalt aluminum oxide compound of formula CoAlxOy (XVI), and/or iron aluminum oxide compound of formula FeAlxOy (XVII). The molecular sieves in component II are molecular sieves with MFI, FER, MWW, and/or MEL topological structures. The skeleton elements of the molecular sieves are composed of Si-O, Si-Al-O, Si-B-O, Si-Al-Ti-O, Ga-Si-O, Ga-Si-Al-O, Mg-Al-P-O, and/or Fe-Si-O, As-Si-O. The molecular sieve has the characteristics of medium strong acid, and the amount of medium strong acid sites is 0.005-2.5 mol/kg. The method of surface coating SiO2is silane or siloxane treatment, or layer of all-silicon molecular sieve is grown on the surface of molecular sieve, or the method of coating SiO2is adopted. The silane is silane compound of fomrla (XVIII), and siloxane is siloxane compound of formula (XIX). The method for growing one layer of all-silicon molecular sieve is a hydrothermal method. The method for coating SiO2is to place molecular sieves in SiO2slurry or sol, and performing dipping or rolling coating. The amount of SiO2coated on the surface is 10-80 wt.% of the mass fraction of component II. R1, R2, R3, R4= hydrogen, halo, hydroxy, alkyl, haloalkyl, aryl, haloaryl; R5 and R6 = hydrogen, halo, hydroxy, alkyl, haloalkyl, aryl, haloaryl; n = 2-1000. An INDEPENDENT CLAIM is also included for direct conversion of synthesis gas to gasoline, comprising taking synthesis gas as the reaction raw material, carrying out conversion reaction on fixed bed or moving bed, the synthesis gas is H2/CO mixed gas, the ratio of H2/CO is 0.2-3.5, the pressure of synthesis gas is 0.5-10 MPa, the reaction temperature is 300-600℃, and the space velocity is 300-15000 ml/g cat/h.