Jump to main content
Jump to site search

Issue 5, 2017
Previous Article Next Article

Mechanistic insights into heterogeneous methane activation

Author affiliations

Abstract

While natural gas is an abundant chemical fuel, its low volumetric energy density has prompted a search for catalysts able to transform methane into more useful chemicals. This search has often been aided through the use of transition state (TS) scaling relationships, which estimate methane activation TS energies as a linear function of a more easily calculated descriptor, such as final state energy, thus avoiding tedious TS energy calculations. It has been shown that methane can be activated via a radical or surface-stabilized pathway, both of which possess a unique TS scaling relationship. Herein, we present a simple model to aid in the prediction of methane activation barriers on heterogeneous catalysts. Analogous to the universal radical TS scaling relationship introduced in a previous publication, we show that a universal TS scaling relationship that transcends catalysts classes also seems to exist for surface-stabilized methane activation if the relevant final state energy is used. We demonstrate that this scaling relationship holds for several reducible and irreducible oxides, promoted metals, and sulfides. By combining the universal scaling relationships for both radical and surface-stabilized methane activation pathways, we show that catalyst reactivity must be considered in addition to catalyst geometry to obtain an accurate estimation for the TS energy. This model can yield fast and accurate predictions of methane activation barriers on a wide range of catalysts, thus accelerating the discovery of more active catalysts for methane conversion.

Graphical abstract: Mechanistic insights into heterogeneous methane activation

Back to tab navigation

Supplementary files

Publication details

The article was received on 22 Nov 2016, accepted on 09 Jan 2017 and first published on 11 Jan 2017


Article type: Paper
DOI: 10.1039/C6CP08003K
Phys. Chem. Chem. Phys., 2017,19, 3575-3581

  •   Request permissions

    Mechanistic insights into heterogeneous methane activation

    A. A. Latimer, H. Aljama, A. Kakekhani, J. S. Yoo, A. Kulkarni, C. Tsai, M. Garcia-Melchor, F. Abild-Pedersen and J. K. Nørskov, Phys. Chem. Chem. Phys., 2017, 19, 3575
    DOI: 10.1039/C6CP08003K

Search articles by author

Spotlight

Advertisements