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Dual‐bed Catalytic System for the Selective Reduction of NO x with Propene
Author(s) -
PérezRamírez J.,
Vaccaro A. R.,
Kapteijn F.,
Moulijn J. A.
Publication year - 2000
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/1521-4125(200008)23:8<721::aid-ceat721>3.0.co;2-0
Subject(s) - nox , propene , catalysis , selective catalytic reduction , selectivity , chemistry , selective reduction , oxygen , chemical engineering , inorganic chemistry , organic chemistry , combustion , engineering
For the removal of NO x from exhausts containing excess oxygen, the selective catalytic reduction of NO x using hydrocarbons (HC‐SCR) is highly interesting, especially for car applications (lean deNO x ) [1]. Two types of HC‐SCR catalysts can be distinguished. High‐temperature catalysts operate at temperatures above 573 K, showing moderate activity, and (mostly) low heat and poison resistance, but high N 2 selectivity. Low‐temperature catalysts, usually based on Pt, operate between 473 and 573 K, showing opposite features: very high activity, as well as heat and poison resistance, and a low N 2 selectivity by forming N 2 O. Our strategy for developing an active and stable deNO x system without N 2 O emission is the implementation of a separate catalytic function for N 2 O removal as a second stage.