Mechanistic Aspects of HC-SCR over HZSM-5 - Hydrocarbon Activation and Role of Carbon-Nitrogen Intermediates
Artikel i vetenskaplig tidskrift, 2006

This study focuses on the mechanism of lean NO 2 reduction by hydrocarbons (propane, propene, and isobutane) over HZSM-5. In-situ FTIR measurements indicate a close correlation between formation of isocyanate species, consumption of water (formed in the reaction), and formation of amine species. The results in this investigation confirm our previously suggested reaction mechanism, which involves reaction of NO + species and hydrocarbon-derived species over Brønsted acid sites, forming isocyanate species. These species are hydrolyzed by water, forming amine species and, finally, N 2 . Experiments with 18 O 2 show an enhanced oxidation of propane by oxygen, in the presence of NO 2 . This effect can possibly be explained by a type of reaction mechanism where gas-phase and/or loosely bound NO 2 react with the adsorbed hydrocarbon-derived species (i.e., carbenium ion adsorbates and/or alkenes), which then more easily react with oxygen. © 2006 American Chemical Society.

Författare

Hanna Härelind

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Anders Palmqvist

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Journal of Physical Chemistry B

1520-6106 (ISSN) 1520-5207 (eISSN)

Vol. 110 18392-18400

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

DOI

10.1021/jp063683z