Hampered PdO Redox Dynamics by Water Suppresses Lean Methane Oxidation over Realistic Palladium Catalysts
Journal article, 2021

By use of operando spectroscopies under cycling reaction conditions, water is shown to hamper the redox dynamics of realistic palladium oxide nanoparticles dispersed onto alumina and hydrophobic zeolite supports thereby lowering the activity for total oxidation of methane. Water adsorption forms hydroxyl ad-species that block the methane and oxygen dissociation and seem to prevent lattice oxygen to take part in the methane oxidation. The main catalytic action is thus proposed to shift from the Mars-van Krevelen mechanism in dry conditions to a slower route that relies on Langmuir-Hinshelwood type of steps in wet conditions. This key finding has clear implications on catalyst design for low-temperature gas combustion emission control.

Operando characterization

Methane emission control

Catalyst design

CH activation 4

Pd catalyst

Author

Peter Velin

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Per-Anders Carlsson Group

Felix Hemmingsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Per-Anders Carlsson Group

Andreas Schaefer

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Magnus Skoglundh

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Kirill A. Lomachenko

European Synchrotron Radiation Facility (ESRF)

Agnes Raj

Johnson Matthey

David Thompsett

Johnson Matthey

Gudmund Smedler

Johnson Matthey AB

Per-Anders Carlsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Per-Anders Carlsson Group

ChemCatChem

1867-3880 (ISSN) 1867-3899 (eISSN)

Vol. In Press

Subject Categories

Other Chemical Engineering

Other Chemistry Topics

Organic Chemistry

DOI

10.1002/cctc.202100829

More information

Latest update

8/10/2021