Selective catalytic reduction of NOx over H-ZSM-5 under lean conditions using transient NH3 supply
Journal article, 2004

The selective catalytic reduction (SCR) of NO x over zeolite H-ZSM-5 with ammonia was investigated using in situ FTIR spectroscopy and flow reactor measurements. The adsorption of ammonia and the reaction between NO x , O2 and either pre-adsorbed ammonia or transiently supplied ammonia were investigated for either NO or equimolar amounts of NO and NO2. With transient ammonia supply the total NO reduction increased and the selectivity to N2O formation decreased compared to continuous supply. The FTIR experiments revealed that NO x reacts with ammonia adsorbed on Brønsted acid sites as NH4 + ions. These experiments further indicated that adsorbed -NO2 – is formed during the SCR reaction over H-ZSM-5.

ammonia transients

H-ZSM-5

NH3-SCR

in situ FTIR

selective catalytic reduction of NOx

Author

Mikaela Wallin

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Carl-Johan Karlsson

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Anders Palmqvist

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)

Topics in Catalysis

1022-5528 (ISSN) 1572-9028 (eISSN)

Vol. 30/31 1-4 107-113

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Transport

Energy

Materials Science

Subject Categories

Chemical Engineering

Environmental Sciences

More information

Created

10/7/2017