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Potential and Limitations of Natural Chabazite for Selective Catalytic Reduction of NOx with NH 3
Author(s) -
Günter Tobias,
Casapu Maria,
Doronkin Dmitry,
Mangold Stefan,
Trouillet Vanessa,
Augenstein Timo,
Grunwaldt JanDierk
Publication year - 2013
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.201200182
Subject(s) - chabazite , selective catalytic reduction , catalysis , nox , chemistry , copper , inorganic chemistry , zeolite , chemical engineering , organic chemistry , combustion , engineering
The potential of the natural chabazite for the selective catalytic reduction (SCR) of NOx with NH 3 is evaluated in the present work. Activity tests were performed under technically relevant reaction and temperature conditions for the fresh and hydrothermally aged catalysts. The natural chabazite before and after alkaline removal as well as after iron and copper addition were compared. The structural as well as surface and bulk properties were elucidated by a variety of complementary characterization techniques, i.e. XRD, XPS, EPR, BET, NH 3 ‐TPD, ex situ and in situ XAS. The results indicate that an important facet for using the natural chabazite for the standard and fast SCR reactions is the removal of alkaline metals, which at the same time also leads to a partial change of the structure and the size of the iron‐containing particles. The performance and especially the hydrothermal stability can be further improved by copper addition.