Статья

Modified zeolite ZSM-5 for the methanol to aromatics reaction

Marco ConteCardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, UKJosé Antonio López-SánchezCardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, UKQian HeCenter for Advanced Materials and Nanotechnology, Lehigh University, 5 East Packer Avenue, Bethlehem, USADavid MorganCardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, UKYulia RyabenkovaCardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, UKJonathan K. BartleyCardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, UKAlbert F. CarleyCardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, UKStuart H. TaylorCardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, UKChristopher J. KielyCenter for Advanced Materials and Nanotechnology, Lehigh University, 5 East Packer Avenue, Bethlehem, USAKarim KhalidSABIC Technology & Innovation, Riyadh 11551, Saudi ArabiaGraham J. HutchingsCardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, UK

2011en

ABI

Аннотация

Catalysts comprising zeolite ZSM-5 impregnated with precious metals including Ag, Cu, Ni, Pd, Ir and Ru, have been tested for the methanol to hydrocarbons reaction in a continuous flow fixed bed reactor. Comparison with the activity of unmodified ZSM-5 showed that Ag, Cu and Ni enhanced the selectivity to C6–C11 aromatic products by a factor of two or higher. Moreover, Ag/ZSM-5 showed improved selectivity for the C6–C7 fraction of aromatic products. Ni/ZSM-5 was found to be selective to naphthalene, while Cu/ZSM-5 was selective for C9–C11 aromatic products. It was ascertained that all the impregnated metals were present as metal oxides in the starting materials. It is therefore proposed that the enhanced selectivity to aromatic products is due to the interaction of the acid sites of the zeolite with the basic sites of the metal oxide at the edge of the zeolite crystals, as well as the possible coordination of propene molecules formed during the reaction, that are likely to be the building blocks for the formation of aromatics.

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Идентификаторы

DOI: 10.1039/c1cy00299f

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