Journal
JOURNAL OF CATALYSIS
Volume 311, Issue -, Pages 6-16Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2013.11.003
Keywords
Methanol-to-olefins; Zeolite; Aromatic dealkylation; Paring mechanism; Side-chain mechanism; Ethylene; Propylene; Isotopic experiments
Categories
Funding
- Dow Chemical Company
- National Science Foundation [CBET 1055846]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1055846] Funding Source: National Science Foundation
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Co-reactions of 7.5-9.3 kPa of DME with 4 kPa of toluene, p-xylene, and 4-ethyltoluene on H-ZSM-5 at 523-723 K at low conversions (<10 C%) with varying isotopic feed compositions of C-13/C-12 show that carbons originating from the aromatic ring are incorporated into ethene and propene. A comparison of the predicted C-13-contents of ethene and propene postulated on the basis of the paring, side-chain, and ring-expansion aromatic dealkylation mechanisms based on the experimentally observed isotopologue distribution of 1,2,4-trimethylbenzene, 1,2,4,5-tetramethylbenzene, and 4-ethyltoluene reveal that the predicted C-13-content of ethene and propene from 1,2,4,5-tetramethylbenzene via the paring mechanism most closely match the experimentally observed C-13-contents of ethene and propene (<10% mean relative error), compared to the other mechanisms and aromatic precursors examined. This work quantitatively shows that aromatic dealkylation to form ethene and propene occurs through the paring mechanism and that 1,2,4,5-tetraMB is the predominant aromatic precursor for light olefin formation for MTO conversion on H-ZSM-5 for a 200 K range in temperature. (C) 2013 Elsevier Inc. All rights reserved.
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