Reexamination on transition-metal substituted MFI zeolites for catalytic conversion of methanol into light olefins

CATEGORY: ZEOLITES
Fuel Processing Technology, Volume 115, November 2013, Pages 34–41
Reexamination on transition-metal substituted MFI zeolites for catalytic conversion of methanol into light olefins
Yingjie Jin a, Sachio Asaoka b, Shudong Zhang c, Ping Li a, Shanlin Zhao a
a School of Petrochemical and Technology, Liaoning Shihua University, Fushun 113001, Liaoning Province, PR China
b Department of Chemical Processes and Environments, Faculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu, Fukuoka 808-0135, Japan
c Fushun Research Institute of Petroleum and Petrochemicals, SINOPEC, Fushun 113001, Liaoning Province, PR China
Abstract
Describes hydrothermal synthesis of zeolites with MFI structure according to silicon-to-heteroatom ratios around 56. For methanol-to-olefin (MTO) reaction, the catalytic performance of these zeolites was observed to correlate with the transition metal combinations and acid properties.
Among the MFI-metallosilicate catalysts, aluminous H-ZSM-5 showed the highest methanol conversion but relatively lower selectivity towards light olefins. For the introduction of Fe or Ga species, the isostructural incorporation of iron ions into silicate and aluminosilicate frameworks led to considerable increases in light olefin selectivity, whereas the presence of Ga or Ga–Al in MFI frameworks promoted the formation of C5+ and aromatic fractions.
Full Text Source (Subscription or Fee): http://www.sciencedirect.com/science/article/pii/S0378382013001549