JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Print ISSN : 0021-9592
Catalysis, Kinetics and Reactor Design
Effect of Pore-Diffusion on Catalytic Reduction of NO over Co- and Cu-Mordenites
AKIRA SHICHIATSUSHI SATSUMASHIN-ICHI KOMAITADASHI HATTORI
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2001 Volume 34 Issue 2 Pages 102-106

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Abstract

The influence of intracrystalline diffusivity on the selective catalytic reduction of NO with C3H8 over Co- and Cu-exchanged mordenites is examined by using mordenite samples of different crystal sizes. In the case of Co-mordenite, the intracrystalline diffusion limits the reaction and the effectiveness factor decreases with decreasing reaction temperature contrary to the usual case. In the case of Cu-mordenite, the rate of NO reduction does not depend on the crystal size of mordenite in spite of a larger reaction rate than that over Co-mordenite, which indicates that the intracrystalline diffusion in Cu-mordenite is much faster than that in Co-mordenite. These results are discussed in terms of adsorption-controlled diffusion: That is, strong adsorptive interaction of NO with Co ion, examined through TPD of NO, should be responsible for the slower diffusion rate in Co-mordenite and for the unusual temperature dependence of effectiveness factor of Co-mordenite.

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© 2001 The Society of Chemical Engineers, Japan
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