Aspects of reducing agent and role of amine species in the reduction of NO over H-ZSM-5 in oxygen excess
Journal article, 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.

H-ZSM-5

lean NO reduction

FTIR

ammonia

isopropylamine

propane

Author

R. Matarrese

Polytechnic University of Milan

Hanna Härelind Ingelsten

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Magnus Skoglundh

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Journal of Catalysis

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

Vol. 258 2 386-392

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Transport

Energy

Materials Science

Subject Categories

Other Chemistry Topics

Other Materials Engineering

Chemical Sciences

DOI

10.1016/j.jcat.2008.06.025

More information

Latest update

11/5/2018