Method for direct production of gasoline-range hydrocarbons from carbon dioxide hydrogenation

A method for direct production of gasoline-range hydrocarbons via carbon dioxide hydrogenation comprising:

• converting a gas stream comprising carbon dioxide and hydrogen to gasoline-range hydrocarbons in the presence of a multifunctional catalyst, wherein the multifunctional catalyst comprises an iron-based catalyst for carbon dioxide hydrogenation as a first component and at least one or two kinds of zeolites optionally modified with a metal as a second component, the mass ratio of the first component to the second component is 1:10 to 10:1, and the first and second components are mixed according to any one of the following three methods:
• (1) powder mixing method comprising:
• grinding and mixing powders of iron-based catalyst and zeolite at the required mass ratio of iron-catalyst to zeolite;
• pelleting, crushing, and sieving to form the multifunctional catalyst;
• (2) granule mixing method comprising:
• pelleting iron-based catalyst powders and zeolite powders, crushing, and sieving;
• mixing homogeneously the sieved granules of iron-based catalysts and zeolites at the required mass ratio of iron-catalyst to zeolite to form the multifunctional catalyst;
• (3) multilayer catalyst packing method comprising:
• packing catalyst into a reactor according to the sequences of an iron-based catalyst layer and a zeolite layer, wherein the iron-based catalyst layer is near to the feedstock inlet and the zeolite layer is far to the feedstock inlet;
• wherein between the iron-based catalyst layer and the zeolite layer, there is an optional isolating layer composed of inert materials;
• and wherein the mass ratio of the isolating layer to multifunctional catalyst is 0.01-10.