Influence of the Support Acidity of Pt/Aluminum-Silicate Catalysts on the Continuous Reduction of NO under Lean Conditions
Artikel i vetenskaplig tidskrift, 2003

This study focuses on the influence of the support acidity on the continuous reduction of nitric oxide by hydrocarbons over supported Pt catalysts under lean conditions. The support materials used were alumina, silica and co-precipitated aluminum-silicates. Activity studies of NO reduction with either propene or propane as the reducing agent, CO chemisorption, CO oxidation, isopropylamine temperature programmed desorption (TPD) and ammonia TPD experiments have been performed. The isopropylamine TPD experiments indicated the presence of Bronsted acid sites in the samples that contained alumina. The activity for NO reduction and the selectivity for N-2 formation with propene as the reducing agent showed no pronounced differences between the samples studied. For propane, on the other hand, expressed differences in NO reduction activity between the samples were observed. The activation of propane and consequently the reduction of NO, seemed to be promoted by the presence of acidic sites on the surface of the support. The selectivity towards N2 formation seemed to be strongly connected to the amount of Bronsted acid sites present in the samples.

aluminum-silicate

isopropylamine

alumina

ammonia

support acidity

TPD

propane

silica

lean NO reduction

propene

platinum

Författare

Hanna Härelind

Kompetenscentrum katalys (KCK)

Institutionen för teknisk ytkemi

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Institutionen för teknisk ytkemi

Erik Fridell

Kompetenscentrum katalys (KCK)

Chalmers, Teknisk fysik, Kemisk fysik

Applied Catalysis B: Environmental

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

Vol. 41 3 287-300

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

DOI

10.1016/S0926-3373(02)00167-4