Did Chemisorption Become an Obsolete Method With Advent of Tem? Comparison of Mean Particle Size and Distribution of Silver on Alumina
Artikel i vetenskaplig tidskrift, 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

Författare

Kalle Arve

Abo Akademi University Laboratory of Industrial Chemistry

Hannes Kannisto

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Kompetenscentrum katalys (KCK)

Hanna Härelind

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Kari Eränen

Abo Akademi University Laboratory of Industrial Chemistry

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Dmitry Yu. Murzin

Abo Akademi University Laboratory of Industrial Chemistry

Catalysis Letters

1011-372X (ISSN) 1572-879X (eISSN)

Vol. 141 665-669

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Kemiteknik

Kemi

DOI

10.1007/s10562-011-0557-7