Advanced search
1 file | 15.74 MB Add to list

Unraveling the reaction mechanisms governing methanol-to-olefins catalysis by theory and experiment

(2013) CHEMPHYSCHEM. 14(8). p.1526-1545
Author
Organization
Abstract
The conversion of methanol to olefins (MTO) over a heterogeneous nanoporous catalyst material is a highly complex process involving a cascade of elementary reactions. The elucidation of the reaction mechanisms leading to either the desired production of ethene and/or propene or undesired deactivation has challenged researchers for many decades. Clearly, catalyst choice, in particular topology and acidity, as well as the specific process conditions determine the overall MTO activity and selectivity; however, the subtle balances between these factors remain not fully understood. In this review, an overview of proposed reaction mechanisms for the MTO process is given, focusing on the archetypal MTO catalysts, H-ZSM-5 and H-SAPO-34. The presence of organic species, that is, the so-called hydrocarbon pool, in the inorganic framework forms the starting point for the majority of the mechanistic routes. The combination of theory and experiment enables a detailed description of reaction mechanisms and corresponding reaction intermediates. The identification of such intermediates occurs by different spectroscopic techniques, for which theory and experiment also complement each other. Depending on the catalyst topology, reaction mechanisms proposed thus far involve aromatic or aliphatic intermediates. Ab initio simulations taking into account the zeolitic environment can nowadays be used to obtain reliable reaction barriers and chemical kinetics of individual reactions. As a result, computational chemistry and by extension computational spectroscopy have matured to the level at which reliable theoretical data can be obtained, supplying information that is very hard to acquire experimentally. Special emphasis is given to theoretical developments that open new perspectives and possibilities that aid to unravel a process as complex as methanol conversion over an acidic porous material.
Keywords
heterogeneous catalysis, chemical kinetics, methanol-to-olefins process, reaction mechanisms, DENSITY-FUNCTIONAL THEORY, ACIDIC ZEOLITE CATALYSTS, MOLECULAR-DYNAMICS SIMULATIONS, HYDROCARBON POOL MECHANISM, SURFACE METHOXY GROUPS, SOLID-STATE NMR, IN-SITU NMR, H-1 MAS NMR, SHAPE-SELECTIVITY, COKE FORMATION, ab initio calculations

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 15.74 MB

Citation

Please use this url to cite or link to this publication:

MLA
Hemelsoet, Karen, Jeroen Van der Mynsbrugge, Kristof De Wispelaere, et al. “Unraveling the Reaction Mechanisms Governing Methanol-to-olefins Catalysis by Theory and Experiment.” CHEMPHYSCHEM 14.8 (2013): 1526–1545. Print.
APA
Hemelsoet, Karen, Van der Mynsbrugge, J., De Wispelaere, K., Waroquier, M., & Van Speybroeck, V. (2013). Unraveling the reaction mechanisms governing methanol-to-olefins catalysis by theory and experiment. CHEMPHYSCHEM, 14(8), 1526–1545.
Chicago author-date
Hemelsoet, Karen, Jeroen Van der Mynsbrugge, Kristof De Wispelaere, Michel Waroquier, and Veronique Van Speybroeck. 2013. “Unraveling the Reaction Mechanisms Governing Methanol-to-olefins Catalysis by Theory and Experiment.” Chemphyschem 14 (8): 1526–1545.
Chicago author-date (all authors)
Hemelsoet, Karen, Jeroen Van der Mynsbrugge, Kristof De Wispelaere, Michel Waroquier, and Veronique Van Speybroeck. 2013. “Unraveling the Reaction Mechanisms Governing Methanol-to-olefins Catalysis by Theory and Experiment.” Chemphyschem 14 (8): 1526–1545.
Vancouver
1.
Hemelsoet K, Van der Mynsbrugge J, De Wispelaere K, Waroquier M, Van Speybroeck V. Unraveling the reaction mechanisms governing methanol-to-olefins catalysis by theory and experiment. CHEMPHYSCHEM. 2013;14(8):1526–45.
IEEE
[1]
K. Hemelsoet, J. Van der Mynsbrugge, K. De Wispelaere, M. Waroquier, and V. Van Speybroeck, “Unraveling the reaction mechanisms governing methanol-to-olefins catalysis by theory and experiment,” CHEMPHYSCHEM, vol. 14, no. 8, pp. 1526–1545, 2013.
@article{4096978,
  abstract     = {The conversion of methanol to olefins (MTO) over a heterogeneous nanoporous catalyst material is a highly complex process involving a cascade of elementary reactions. The elucidation of the reaction mechanisms leading to either the desired production of ethene and/or propene or undesired deactivation has challenged researchers for many decades. Clearly, catalyst choice, in particular topology and acidity, as well as the specific process conditions determine the overall MTO activity and selectivity; however, the subtle balances between these factors remain not fully understood. In this review, an overview of proposed reaction mechanisms for the MTO process is given, focusing on the archetypal MTO catalysts, H-ZSM-5 and H-SAPO-34. The presence of organic species, that is, the so-called hydrocarbon pool, in the inorganic framework forms the starting point for the majority of the mechanistic routes. The combination of theory and experiment enables a detailed description of reaction mechanisms and corresponding reaction intermediates. The identification of such intermediates occurs by different spectroscopic techniques, for which theory and experiment also complement each other. Depending on the catalyst topology, reaction mechanisms proposed thus far involve aromatic or aliphatic intermediates. Ab initio simulations taking into account the zeolitic environment can nowadays be used to obtain reliable reaction barriers and chemical kinetics of individual reactions. As a result, computational chemistry and by extension computational spectroscopy have matured to the level at which reliable theoretical data can be obtained, supplying information that is very hard to acquire experimentally. Special emphasis is given to theoretical developments that open new perspectives and possibilities that aid to unravel a process as complex as methanol conversion over an acidic porous material.},
  author       = {Hemelsoet, Karen and Van der Mynsbrugge, Jeroen and De Wispelaere, Kristof and Waroquier, Michel and Van Speybroeck, Veronique},
  issn         = {1439-4235},
  journal      = {CHEMPHYSCHEM},
  keywords     = {heterogeneous catalysis,chemical kinetics,methanol-to-olefins process,reaction mechanisms,DENSITY-FUNCTIONAL THEORY,ACIDIC ZEOLITE CATALYSTS,MOLECULAR-DYNAMICS SIMULATIONS,HYDROCARBON POOL MECHANISM,SURFACE METHOXY GROUPS,SOLID-STATE NMR,IN-SITU NMR,H-1 MAS NMR,SHAPE-SELECTIVITY,COKE FORMATION,ab initio calculations},
  language     = {eng},
  number       = {8},
  pages        = {1526--1545},
  title        = {Unraveling the reaction mechanisms governing methanol-to-olefins catalysis by theory and experiment},
  url          = {http://dx.doi.org/10.1002/cphc.201201023},
  volume       = {14},
  year         = {2013},
}

Altmetric
View in Altmetric
Web of Science
Times cited: