The effect of Pt/Pd ratio on the oxidation activity and resistance to sulfur poisoning for Pt-Pd/BEA diesel oxidation catalysts with high siliceous content
Artikel i vetenskaplig tidskrift, 2022

This study investigates the effect of the Pt/Pd ratio on the oxidation activity and sulfur poisoning/regeneration of diesel oxidation catalysts (DOC) using beta zeolites with high siliceous content as support. Formation of Pt-Pd alloy leads to contraction of the cell lattice of Pt in the bimetallic catalysts, improving not only the sintering resistance of Pt but also retaining a high fraction of Pd in Pd2+ form. Moreover, the Pt-Pd alloy also improves the oxidation resistance of the particles, which enhances the activity of the catalysts for CO and C3H6 oxidation. Bimetallic catalysts also favor NO reduction at a lower temperature than the monometallic Pt although they showed lower values for the absolute conversion of NO due to a decrease in the total number of the Pt active sites. In addition, the bimetallic catalysts significantly improved the sulfur resistance as compared to the monometallic Pd catalyst. Moreover, the bimetallic catalysts could easily recover their activity for NO and C3H6 oxidation by thermal treatment either in lean conditions or in H2. The reduction with H2 was necessary to recover completely the activity of the CO and C3H8 oxidation.

Pt/Pd ratios

High siliceous zeolites

Diesel oxidation catalysts

PtPd alloy

Sulfur poisoning

Författare

Hoang Phuoc Ho

Chalmers, Kemi och kemiteknik, Kemiteknik

Jieling Shao

Chalmers, Kemi och kemiteknik, Kemiteknik

Dawei Yao

Chalmers, Kemi och kemiteknik, Kemiteknik

Rojin Feizie Ilmasani

Chalmers, Kemi och kemiteknik, Kemiteknik

Muhammad Abdus Salam

Chalmers, Kemi och kemiteknik, Kemiteknik

Derek Creaser

Chalmers, Kemi och kemiteknik, Kemiteknik

Louise Olsson

Chalmers, Kemi och kemiteknik, Kemiteknik

Journal of Environmental Chemical Engineering

2213-2929 (ISSN) 2213-3437 (eISSN)

Vol. 10 4 108217

Ämneskategorier

Kemiska processer

Annan kemiteknik

Annan kemi

Infrastruktur

Chalmers materialanalyslaboratorium

DOI

10.1016/j.jece.2022.108217

Mer information

Senast uppdaterat

2023-04-11