| abstract |
The present invention belongs to direct preparation of light olefins using syngas, and particularly relates to a catalyst and a method for preparing light olefins using direct conversion of syngas. The method uses syngas as reaction raw material, and conducts a conversion reaction on a fixed bed or a moving bed. The catalyst is a composite catalyst A+B and formed by compounding catalyst A and catalyst B in a mechanical mixing mode, wherein the active ingredient of catalyst A is active metal oxide; and catalyst B is one or more than one of zeolite of CHA and AEI structures or metal modified CHA and/or AEI zeolite. A spacing between geometric centers of the active metal oxide of the catalyst A and the particle of the catalyst B is 5 µm-40 mm. A spacing between axes of the particles is preferably 100 µm-5mm, and more preferably 200 µm-4mm. A weight ratio of the active ingredients in the catalyst A and the catalyst B is within a range of 0.1-20 times, and preferably 0.3-5. |