Omojola, T, Lukyanov, DB, Cherkasov, N, Zholobenko, VL ORCID: https://orcid.org/0000-0002-6024-0503 and van Veen, AC (2019) The influence of precursors on the induction period and transition-regime of dimethyl ether conversion to hydrocarbons over ZSM-5 catalysts. Industrial & Engineering Chemistry Research, 58 (36). pp. 16479-16488.

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Abstract

ZSM-5 catalysts were subjected to step response cycles of dimethyl ether (DME) at 300 °C in a temporal analysis of products (TAP) reactor. Propylene is the major olefin and displays an S-shaped profile. A 44-min induction period occurs before primary propylene formation and is reduced upon subsequent step response cycles. The S-shaped profile was interpreted according to induction, transition-regime and steady-state stages to investigate hydrocarbon formation from DME. The influence of precursors (carbon monoxide, hydrogen, dimethoxymethane, and 1,5-hexadiene) was studied using a novel consecutive step response methodology in the TAP reactor. Addition of dimethoxymethane, carbon monoxide, hydrogen or 1,5-hexadiene reduces the induction period of primary olefin formation. However, while dimethoxymethane, carbon monoxide and hydrogen accelerate the transition-regime towards hydrocarbon pool formation, 1,5-hexadiene attenuates it. Heavier hydrocarbons obtained from 1,5-hexadiene compete for active sites during secondary olefin formation. A phenomenological evaluation of multiple parameters is presented.

Item Type: Article
Additional Information: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via American Chemical Society at http://doi.org/10.1021/acs.iecr.9b03344 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: Methanol, Methanol-to-olefins, ZSM-5, Dimethyl Ether (DME), Temporal Analysis of Products (TAP) reactor, primary olefins, nucleation kinetics, dimethoxymethane (DMM), diene, transition-regime, induction period, hydrocarbon-pool, multi-parameter space evaluation
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
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Depositing User: Symplectic
Date Deposited: 16 Aug 2019 15:46
Last Modified: 03 Oct 2019 09:48
URI: http://eprints.keele.ac.uk/id/eprint/6709

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