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Investigation into the Use of Copper‐Loaded Natural Zeolite for the Reduction of NO Using Methane
Author(s) -
Headon K. A.,
Zhang D. K.
Publication year - 1998
Publication title -
developments in chemical engineering and mineral processing
Language(s) - English
Resource type - Journals
eISSN - 1932-2143
pISSN - 0969-1855
DOI - 10.1002/apj.5500060102
Subject(s) - zeolite , calcination , copper , catalysis , methane , chemistry , ion exchange , inorganic chemistry , decomposition , selective catalytic reduction , nitrogen , ion , chemical engineering , organic chemistry , engineering
The suitability of a copper‐loaded natural zeolite for the selective reduction of NO using methane was examined in a packed‐bed tubular reactor. The natural zeolite was found to decompose NO to nitrogen with a maximum conversion of30% achieved at 420 °C when 2% NO, 1% CH 4 and 2% O 2 were used with a contact time of 0.9 gscm −3 . Exchange of the zeolite to the H‐form prior to copper ion‐exchange was essential for catalytic activity to be promoted by the presence of oxygen. The catalytic nature of the decomposition reaction was confirmed through experiments in the absence of any catalyst. Calcination of the zeolites after ion‐exchange resulted in no discernible effect on catalytic activity, and the use of Mg as a cocation also did not promote the activity. For a H‐exchanged sample, activity was significantly decreased.