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Reduction of Nitrogen Oxides by Ammonia Over Iron‐Containing Catalysts
Author(s) -
Jan M. T.,
Kureti S.,
Hizbullah K.,
Jan N.
Publication year - 2007
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/ceat.200700076
Subject(s) - catalysis , selective catalytic reduction , ammonia , chemistry , diesel fuel , diesel exhaust , incipient wetness impregnation , nitrogen , inorganic chemistry , atmospheric temperature range , thermal stability , nuclear chemistry , selectivity , organic chemistry , physics , meteorology
Selective catalytic reduction (SCR) of NO x by NH 3 is an efficient technology for the removal of nitrogen oxides from diesel exhaust. It is a disadvantage that the active component in commercial catalysts, V 2 O 5 , is toxic and melts at ∼650 °C. An alternative catalyst system, based on iron as the active component, was developed in this work. For this purpose, a number of supports were taken and impregnated with Fe 2 O 3 and Fe 2 O 3 /WO 3 by an incipient wetness technique. The synthesized catalysts were tested in a diesel model exhaust using temperature programmed reaction. The screening accomplished to date, resulted in a 5.8 mol.‐% Fe 2 O 3 /Al 2 O 3 catalyst that exhibited outstanding activity in the temperature range between 150–375 °C with selective formation of N 2 . However, this catalyst was significantly deactivated by thermal aging at 600 °C. In contrast, the activity of the sample with 1.4 mol.‐% Fe 2 O 3 and 0.8 mol.‐% WO x showed very high thermal stability as well as selective N 2 production over the whole temperature regime, but it had lower SCR activity.