Property–Activity Relations for Methane Activation by Dual-Metal Cu–Oxo Trimers in ZSM-5 Zeolite

Chong Liu, Guanna Li*, Evgeny A. Pidko*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Scopus)

Abstract

The identification of correlations between the experimentally or computationally measurable parameters of a catalytic system and its reactivity is one of the key steps toward the realization of a catalysis by design strategy. Here, periodic density functional theory calculations to establish such correlations for perspective catalysts for selective methane oxidation based on dual-metal cation-exchanged zeolites are employed. A representative trimeric metal–oxo active site is considered as a model reactive center. Computations reveal that the activation barrier for the homolytic C-H bond cleavage in methane correlates well with the thermodynamic stability of the resulting CH3·-HO intermediate. The stability of the HO part approximated by the hydrogen affinity of the active site correlates with the activity trend, but deviations are observed due to inability of this descriptor to account for the stabilization of the CH3∙ moiety. Such fundamental characteristics as the atomic spin density and the basicity of reactive oxygen sites cannot be directly correlated with the catalyst reactivity, implying the complexity in property–reactivity relationship for methane activation. Calculations suggest that the initial screening of the potent zeolite-based catalyst for methane activation can be established based on the analysis of both the thermodynamics and perturbation of base molecular adsorption probes such as pyrrole.

Original languageEnglish
Article number1800266
Number of pages7
JournalSmall Methods
Volume2
Issue number12
DOIs
Publication statusPublished - 24 Aug 2018
Externally publishedYes

Keywords

  • DFT calculations
  • heterogeneous catalysis
  • methane oxidation
  • reaction mechanism
  • structure–activity relations

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