Aspects of reducing agent and role of amine species in the reduction of NO over H-ZSM-5 in oxygen excess
Artikel i vetenskaplig tidskrift, 2008

In this study the selective catalytic reduction (SCR) of NO has been investigated over H-ZSM-5 with three different reducing agents. Comparison of the reaction mechanisms using propane, ammonia and isopropylamine has been performed using in situ DRIFTS step-response experiments. The same type of surface NH species, likely organic amines, is formed in the presence of either propane or isopropylamine as reducing agent. For NH3, on the other hand, NH4+ is the dominating NH surface species during reaction. Furthermore, in the case of propane, the nature of the NOx-source, i.e. NO or NO2, is crucial for the reaction. With NO2. the reaction likely proceeds fast via direct reduction, while for NO, oxidation to NO2 is required initially. in either case NH species play a vital role in the SCR reaction and organic amines are possible key-intermediates in the SCR with saturated hydrocarbons over H-ZSM-5.

isopropylamine

FTIR

ammonia

lean NO reduction

propane

H-ZSM-5

Författare

R. Matarrese

Politecnico di Milano

Hanna Härelind

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Kompetenscentrum katalys (KCK)

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Journal of Catalysis

0021-9517 (ISSN) 1090-2694 (eISSN)

Vol. 258 386-392

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Annan kemi

Annan materialteknik

Kemi

DOI

10.1016/j.jcat.2008.06.025