Importance

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Abstract

The present invention relates to a process for preparing a catalyst, wherein the process comprises steps of: 1) providing a molecular sieve, adding an active metal promoter into the molecular sieve, and shaping the molecular sieve into a shaped body, 2) placing the shaped body in a fixed bed reactor, 3) dissolving a transition metal salt in a first valence state and a bidentate ligand into a solvent to prepare a solution, 4) passing the solution and ethylene through the fixed bed reactor charged with the shaped body, loading the transition metal onto the molecular sieve through ion exchange, and at the same time the transition metal in the first valence state at least partially being reduced into a transition metal salt in a second valence state by the active metal promoter, wherein the second valence state is lower than the first valence state, so as to obtain the catalyst.

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First Claim