Reaction mechanism for methane-to-methanol in CU-SSZ-13: First-principles study of the Z2[Cu2O] and Z2[Cu2oh] motifs
Journal article, 2021

As transportation continues to increase world-wide, there is a need for more efficient utilization of fossil fuel. One possibility is direct conversion of the solution gas bi-product CH4 into an energy-rich, easily usable liquid fuel such as CH3OH. However, new catalytic materials to facilitate the methane-to-methanol reaction are needed. Using density functional calculations, the partial oxidation of methane is investigated over the small-pore copper-exchanged zeolite SSZ-13. The reaction pathway is identified and the energy landscape elucidated over the proposed motifs Z2 [Cu2O] and Z2 [Cu2OH]. It is shown that the Z2[Cu2O] motif has an exergonic reaction path, provided water is added as a solvent for the desorption step. However, a micro-kinetic model shows that neither Z2 [Cu2O] nor Z2 [Cu2OH] has any notable activity under the reaction conditions. These findings highlight the importance of the detailed structure of the active site and that the most stable motif is not necessarily the most active.

Direct conversion

Micro-kinetic model

DFT

Small-pore zeolite

Methane-to-methanol

Chabazite

Copper

SSZ-13

Reaction mechanism

Author

Unni Engedahl

Chalmers, Physics, Chemical Physics

Competence Centre for Catalysis (KCK)

Adam Arvidsson

Competence Centre for Catalysis (KCK)

Chalmers, Physics, Chemical Physics

Henrik Grönbeck

Chalmers, Physics, Chemical Physics

Competence Centre for Catalysis (KCK)

Anders Hellman

Competence Centre for Catalysis (KCK)

Chalmers, Physics, Chemical Physics

Catalysts

2073-4344 (ISSN)

Vol. 11 1 1-12 17

Subject Categories

Chemical Process Engineering

Biocatalysis and Enzyme Technology

Organic Chemistry

DOI

10.3390/catal11010017

More information

Latest update

2/2/2021 1