Methane oxidation over Pt/Al2O3 and Pd/Al2O3 catalysts under transient conditions
Journal article, 2007

We communicate experimental results for the oxidation of methane by oxygen over alumina supported Pd and Pt monolith catalysts under transient conditions. Temperature programmed reaction (TPReaction) and reactant pulse-response (PR) experiments have been performed, using a continuous gas-flow reactor equipped with a downstream mass spectrometer for gas phase analysis. Special attention was paid to the influence of gas composition changes, i.e., O 2 and H 2 pulsing, respectively, on the methane conversion. For Pt/Al 2 O 3 oxygen pulsing can significantly increase the methane conversion which can be even further improved by pulsing hydrogen instead. Such transient effects are not observed for the Pd/Al 2 O 3 catalyst for which instead constantly lean conditions is beneficial. Our results suggest that under lean conditions Pd and Pt crystallites may undergo bulk- and partial (surface oxide formation) oxidation, respectively, which for Pd results in more active surfaces, while for Pt the activity is reduced. The latter seems to connect to a lowering of the ability to dissociate methane. © 2007 Springer Science+Business Media, LLC.

Author

Per-Anders Carlsson

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering

Erik Fridell

Chalmers, Applied Physics, Chemical Physics

Competence Centre for Catalysis (KCK)

Magnus Skoglundh

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering

Catalysis Letters

1011-372X (ISSN) 1572-879X (eISSN)

Vol. 115 1-2 1-7

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Transport

Energy

Materials Science

Subject Categories

Environmental Sciences

DOI

10.1007/s10562-007-9057-1

More information

Latest update

8/24/2018