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.

CH activation 4

Catalyst design

Methane emission control

Operando characterization

Pd catalyst

Author

Peter Velin

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Felix Hemmingsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Andreas Schaefer

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Magnus Skoglundh

Magnus Skoglundh Group

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

ChemCatChem

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

Vol. 13 17 3765-3771

Fundamental studies on the influence of water on oxidation catalysts for biogas applications

Swedish Energy Agency (P40274-1), 2015-04-01 -- 2019-03-31.

Driving Forces

Sustainable development

Areas of Advance

Transport

Energy

Materials Science

Subject Categories

Other Chemical Engineering

Other Chemistry Topics

Organic Chemistry

Infrastructure

Chalmers Materials Analysis Laboratory

DOI

10.1002/cctc.202100829

More information

Latest update

4/5/2022 6