Structure and performance of zeolite supported Pd for complete methane oxidation
Journal article, 2021

The influence of zeolite support materials and their impact on CH oxidation activity was studied utilizing Pd supported on H-beta and H-SSZ-13. A correlation between CH oxidation activity, Si/Al ratio (SAR), the type of zeolite framework, reduction-oxidation behaviour, and Pd species present was found by combining catalytic activity measurements with a variety of characterization methods (operando XAS, NH -TPD, SAXS, STEM and NaCl titration). Operando XAS analysis indicated that catalysts with high CH oxidation activity experienced rapid transitions between metallic- and oxidized-Pd states when switching between rich and lean conditions. This behaviour was exhibited by catalysts with dispersed Pd particles. By contrast, the formation of ion-exchanged Pd and large Pd particles appeared to have a detrimental effect on the oxidation-reduction behaviour and the conversion of CH . The formation of ion-exchanged Pd and large Pd particles was limited by using a highly siliceous beta zeolite support with a low capacity for cation exchange. The same effect was also found using a small-pore SSZ-13 zeolite due to the lower mobility of Pd species. It was found that the zeolite support material should be carefully selected so that the well-dispersed Pd particles remain, and the formation of ion-exchanged Pd is minimized. 4 4 3 4 4 2+ 2+ 2+

Pd/SSZ-13

Pd/beta

Methane oxidation

Si/Al ratio

Author

Ida Friberg

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Process and Reaction Engineering

Adam H. Clark

Paul Scherrer Institut

Hoang Phuoc Ho

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Process and Reaction Engineering

Nadezda Sadokhina

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Process and Reaction Engineering

Glen J. Smales

Federal Institute for Materials Research and Testing

Jung Won Woo

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Process and Reaction Engineering

Xavier Auvray

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Process and Reaction Engineering

Davide Ferri

Paul Scherrer Institut

Maarten Nachtegaal

Paul Scherrer Institut

Oliver Kröcher

Paul Scherrer Institut

Louise Olsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Catalysis Today

0920-5861 (ISSN)

Vol. In Press

New methodology for fundamental kinetic models in heterogeneous catalysis using inter-disciplinary experiments

Swedish Research Council (VR), 2014-01-01 -- 2019-12-31.

Subject Categories

Inorganic Chemistry

Materials Chemistry

Other Chemical Engineering

DOI

10.1016/j.cattod.2020.11.026

More information

Latest update

4/15/2021