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, Kemisk apparat- och reaktionsteknik

Adam H. Clark

Paul Scherrer Institut

Hoang Phuoc Ho

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparat- och reaktionsteknik

Nadezda Sadokhina

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparat- och reaktionsteknik

Glen J. Smales

Bundesanstalt für Materialforschung und -prüfung (BAM)

Jung Won Woo

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparat- och reaktionsteknik

Xavier Auvray

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparat- och reaktionsteknik

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. In Press

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

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

Ämneskategorier

Oorganisk kemi

Materialkemi

Annan kemiteknik

DOI

10.1016/j.cattod.2020.11.026

Mer information

Senast uppdaterat

2021-04-15