Improvements on Selective Conversion of Methanol and/or Dimethylether into Liquefied Petroleum Gas over Zeolite Catalysts

摘要

For the proposed LPG synthesis, ethylene recirculation conversion with methanol or dimethylether was investigated by the simulation tests of using the coupled reaction of ethylene with oxygenates. The process selectivity in converting unit can be enhanced significantly after a fully recirculation of formed C2 components. For the MFI metallosilicate catalysts, the assembled modes of MFI heteroatoms were correlated with performance in methanol conversion to LPG hydrocarbons. Zeolites containing gallium or gallium-aluminum catalyze methanol conversion along with aromatization. The H-FeAlMFI leads to a great restraint towards aromatization and carbon-chain growth; the zeolite that comprises iron and aluminum was confirmed quite effective for improving the LPG fractional selectivity. The DME conversion results concerning H-FeAlMFI-silicate and unmodified H-ZSM-5 confirmed the improvements in catalytic selectivity and active stability.