Platinum dispersion measurements for Pt/BaO/Al2O3, NOx storage catalysts
Journal article, 2005

In this investigation different experimental methods to determine the platinum dispersion of Pt/BaO/Al2O3 NOx storage catalysts are compared. The dispersion of platinum is determined independently using temperature programmed desorption of CO, dissociation of N2O, static volumetric CO and H2 chemisorption, dynamic CO chemisorption and transmission electron microscopy. For Pt/BaO/Al2O3, reproducible results are obtained when the platinum dispersion is determined from N2O dissociation, CO and H2 chemisorption. However, repeated CO-TPD experiments result in decreased amount of desorbed CO, which limits this method to determine platinum dispersion for Pt/BaO/Al2O3 samples. For Pt/Al2O3, similar values for platinum dispersion are obtained for all methods used in the study. In addition to the platinum dispersion investigations, the surface morphology of Pt/BaO/Al2O3 samples and the distribution of different elements are studied using SEM-EDS. The SEM-EDS analyses show that the platinum is evenly distributed over the entire sample surface, while the distribution of barium is more uneven.

Characterization

CO TPD

Platinum dispersion

SEM

EDS

TEM

CO chemisorption

N2O dissociation

Barium

H2 chemisorption

Author

JAZAER DAWODY

Competence Centre for Catalysis (KCK)

Chalmers, Applied Physics, Chemical Physics

Lisa Eurenius

Competence Centre for Catalysis (KCK)

Chalmers, Applied Physics, Microscopy and Microanalysis

Hussam Abdulhamid

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Magnus Skoglundh

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Eva Olsson

Chalmers, Applied Physics, Microscopy and Microanalysis

Competence Centre for Catalysis (KCK)

Erik Fridell

Competence Centre for Catalysis (KCK)

Chalmers, Applied Physics, Chemical Physics

Applied Catalysis A: General

0926-860X (ISSN) 1873-3875 (eISSN)

Vol. 296 2 157-168

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Transport

Energy

Materials Science

Subject Categories

Chemical Engineering

Environmental Sciences

DOI

10.1016/j.apcata.2005.07.060

More information

Created

10/7/2017