Insight into hydrothermal aging effect on Pd sites over Pd/LTA and Pd/SSZ-13 as PNA and CO oxidation monolith catalysts
Journal article, 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)]+.

PNA

LTA

Pd

Hydrothermal aging

SSZ-13

Author

Aiyong Wang

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Engineering Design

Competence Centre for Catalysis (KCK)

Kristina Lindgren

Chalmers, Physics, Microstructure Physics

Mengqiao Di

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Per-Anders Carlsson Group

Competence Centre for Catalysis (KCK)

Diana Bernin

Competence Centre for Catalysis (KCK)

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Engineering Design

Per-Anders Carlsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Per-Anders Carlsson Group

Competence Centre for Catalysis (KCK)

Mattias Thuvander

Chalmers, Physics, Microstructure Physics

Louise Olsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Competence Centre for Catalysis (KCK)

Applied Catalysis B: Environmental

0926-3373 (ISSN) 1873-3883 (eISSN)

Vol. 278 119315

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

Analytical Chemistry

Materials Chemistry

Areas of Advance

Transport

Infrastructure

Chalmers Materials Analysis Laboratory

DOI

10.1016/j.apcatb.2020.119315

More information

Latest update

11/27/2020