Insight into hydrothermal aging effect on Pd sites over Pd/LTA and Pd/SSZ-13 as PNA and CO oxidation monolith catalysts
Artikel i vetenskaplig tidskrift, 2020
In this study, Pd/LTA and Pd/SSZ-13 were prepared and then hydrothermally aged at the temperature of 750, 800, 850, and 900 °C. Multiple Pd species, including isolated Pd ions (Pd2+ and [Pd(OH)]+) and 1∼2 nm PdOx nanoparticles, were presented in two fresh samples. The Pd/LTA sample showed remarkable hydrothermal stability, but the Pd/SSZ-13 sample experienced severe damage after aging at 900 °C. The destruction of the aged Pd/SSZ-13 sample led to the migration and sintering of PdOx nanoparticles, which formed bulk PdOx particles on the surface of the zeolite crystallite. A large number of PdOx nanoparticles were retained after aging of the Pd/LTA sample. Pd/LTA contained a higher concentration of Pd2+ sites, while Pd/SSZ-13 had more [Pd(OH)]+ sites. It is found that the improvement of NO adsorption ability with CO addition onto Pd2+ was more significant than onto [Pd(OH)]+.
Pd
PNA
Hydrothermal aging
LTA
SSZ-13
Författare
Aiyong Wang
Chalmers, Kemi och kemiteknik, Kemiteknik
Kompetenscentrum katalys
Kristina Lindgren
Chalmers, Fysik, Mikrostrukturfysik
Mengqiao Di
Kompetenscentrum katalys
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Diana Bernin
Chalmers, Kemi och kemiteknik, Kemiteknik
Kompetenscentrum katalys
Per-Anders Carlsson
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Kompetenscentrum katalys
Mattias Thuvander
Chalmers, Fysik, Mikrostrukturfysik
Louise Olsson
Kompetenscentrum katalys
Chalmers, Kemi och kemiteknik, Kemiteknik
Applied Catalysis B: Environmental
0926-3373 (ISSN) 1873-3883 (eISSN)
Vol. 278 119315Ny 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
Analytisk kemi
Materialkemi
Styrkeområden
Transport
Infrastruktur
Chalmers materialanalyslaboratorium
DOI
10.1016/j.apcatb.2020.119315