Methane Oxidation over PdO: Towards a Better Understanding of the Influence of the Support Material
Kevin Keller, Patrick Lott, Steffen Tischer, Maria Casapu, Jan‐Dierk Grunwaldt, Olaf Deutschmann
Abstract
Abstract The presence of water vapor during the oxidation of the strong greenhouse gas methane over PdO‐based catalysts is known to result in severe inhibition and catalyst deactivation. In this context, our current study elucidates the role of the support material for different water concentrations in the reaction gas mixture. Compared to a reference PdO/Al 2 O 3 catalyst, the catalytic activity can be significantly enhanced when using SnO 2 and ZrO 2 as support materials and remains stable during 24 h of operation at 823 K in the presence of 12 % H 2 O, whereas under identical conditions CH 4 conversion drops by 68 % over PdO/Al 2 O 3 . The interplay between Pd species and catalyst support was systematically characterized by thermogravimetric analysis, temperature‐programmed reduction experiments and TEM measurements. Finally, a kinetic scheme was derived based on the experimental data.