Structure and performance of zeolite supported Pd for complete methane oxidation
Artikel i vetenskaplig tidskrift, 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

Författare

Ida Friberg

Chalmers, Kemi och kemiteknik, Kemiteknik

Adam H. Clark

Paul Scherrer Institut

Hoang Phuoc Ho

Chalmers, Kemi och kemiteknik, Kemiteknik

Nadezda Sadokhina

Chalmers, Kemi och kemiteknik, Kemiteknik

Glen J. Smales

Bundesanstalt für Materialforschung und -prüfung (BAM)

Jung Won Woo

Chalmers, Kemi och kemiteknik, Kemiteknik

Xavier Auvray

Chalmers, Kemi och kemiteknik, Kemiteknik

Davide Ferri

Paul Scherrer Institut

Maarten Nachtegaal

Paul Scherrer Institut

Oliver Kröcher

Paul Scherrer Institut

Louise Olsson

Chalmers, Kemi och kemiteknik, Kemiteknik

Catalysis Today

0920-5861 (ISSN)

Vol. 382 3-12

Ny metodik för grundläggande kinetiska modeller i heterogenkatalys med hjälp av tvärvetenskapliga experiment

Vetenskapsrådet (VR) (2014-5733), 2014-01-01 -- 2019-12-31.

Ämneskategorier

Oorganisk kemi

Materialkemi

Annan kemiteknik

DOI

10.1016/j.cattod.2020.11.026

Mer information

Senast uppdaterat

2022-04-05