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QENS study of methane diffusion in Mo/H-ZSM-5 used for the methane dehydroaromatisation reaction

DOI: 10.1063/1.5039294 DOI Help

Authors: Ian P. Silverwood (UK Catalysis Hub, Research Complex at Harwell; ISIS Neutron and Muon Facility) , Miren Agote-aran (UK Catalysis Hub, Research Complex at Harwell; University College London) , Ines Lezcano González (UK Catalysis Hub, Research Complex at Harwell; University College London) , Anna Kroner (Diamond Light Source) , Andrew M. Beale (UK Catalysis Hub, Research Complex at Harwell; University College London)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: Proceedings of the Joint Conference on Quasielastic Neutron Scattering and the Workshop on Inelastic Neutron Spectrometers QENS/WINS 2016
Peer Reviewed: No

State: Published (Approved)
Published: May 2018

Abstract: There is commercial interest in understanding the deactivation of Mo loaded H-ZSM-5 catalyst by coke fouling during the methane dehydroaromatization reaction (MDA). The effect of coke on methane diffusion inside the zeolite pores was studied by quasielastic neutron scattering (QENS) measurements on Mo/H-ZSM-5 samples reacted with methane for 0, 7, 25 and 60 min. Catalytic activity of the samples followed by mass spectrometry indicate that the induction period in which Mo species are carburized lasts for ∼9 min; after this period the material shows selectivity to aromatics. Characterization by TGA and N2 physisorption suggest that practically no carbon is deposited during the induction period. The ∼2 wt % of coke formed after one hour of reaction has a negligible effect in the zeolite crystal structurebut a small effect on the micropore volume. The QENS studies show that the methane transport by jump diffusion is however not measurably affected by the accumulated coke in the samples.

Subject Areas: Chemistry

Facility: ISIS

Added On: 05/06/2018 10:38

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