Did Chemisorption Become an Obsolete Method With Advent of Tem? Comparison of Mean Particle Size and Distribution of Silver on Alumina
Journal article, 2011
Silver particle size and dispersion on a Ag/Al2O3 for HC-SCR were examined by means of chemisorption and TEM. Experimental results showed that determination of the accurate mean particle size (mps) is challenging and that the both applied methods have specific characteristics increasing the inaccuracy in the results which has to be taken into account in evaluation of catalytic activity. The results from TEM imaging were found to depend highly on the mode in which the surface was scanned (bright field versus dark field). Generally the point resolution was higher in dark field but the obtained mps did not increased along with the increasing silver loading. The main limitation with the O-2-chemisorption was related to the choice of the stoichiometric factor between the adsorbent and silver atoms. However, together these techniques support each other and help to give a more realistic picture of the mean silver particle size, distribution and indications of the oxidation states on the alumina support.
hc-scr
ag/al2o3
Dispersion
hydrogen
ag/alumina
oxide
HRTEM
lean-burn conditions
selective catalytic-reduction
hydrocarbons
Mean particle size
nox
ftir
Chemisorption
Author
Kalle Arve
Abo Akademi University Laboratory of Industrial Chemistry
Hannes Kannisto
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Competence Centre for Catalysis (KCK)
Hanna Härelind
Competence Centre for Catalysis (KCK)
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Kari Eränen
Abo Akademi University Laboratory of Industrial Chemistry
Magnus Skoglundh
Competence Centre for Catalysis (KCK)
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Dmitry Yu. Murzin
Abo Akademi University Laboratory of Industrial Chemistry
Catalysis Letters
1011-372X (ISSN) 1572-879X (eISSN)
Vol. 141 5 665-669Driving Forces
Sustainable development
Areas of Advance
Nanoscience and Nanotechnology
Transport
Energy
Materials Science
Subject Categories (SSIF 2011)
Chemical Engineering
Chemical Sciences
DOI
10.1007/s10562-011-0557-7