Catalyst and method for direct conversion of syngas to light olefins
AssigneeDalian Institute of Chemical Physics, Chinese Academy of Sciences
InventorsXinhe Bao, Feng Jiao, Xiulian Pan, Minzheng Ding
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Abstract
Direct conversion of syngas to light olefins is carried out in a fixed bed or a moving bed reactor with a composite catalyst A+B. 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-5 mm, and more preferably 200 μm-4 mm. 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.
Claims20
A catalyst, comprising a metal oxide chosen from MnO, MnCr2O4, MnAl2O4, MnZrO4, ZnO, ZnAl2O4, CoAl2O4, FeAl2O4, or mixtures thereof, and a zeolite of CHA and/or AEI topology.
A catalyst comprising ZnCr2O4 and a zeolite of AEI topology.
A catalyst comprising ZnCr2O4 and a zeolite of CHA topology, wherein the zeolite has a skeleton comprising species chosen from Si—O, Si—Al—O, Si—Al—P—O, Al—P—O, Ga—P—O, Ga—Si—Al—O, Zn—Al—P—O, Mg—Al—P—O, or Co—Al—P—O, wherein the zeolite has an amount of medium-strength acid sites of 0-0.3 mol/kg, wherein the medium-strength acid sites are characterized by a peak temperature range corresponding to a desorption peak of NH3-TPD of 275-500° C. and a chemical shift of 13C-NMR in a range of 210-220 ppm using acetone as a probe molecule.
Dependencies are inferred from the claim text.