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Co/KxTi2O5 catalysts prepared by ion exchange method for NO oxidation to NO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
48455 46508 2008 7 PDF Available
Title
Co/KxTi2O5 catalysts prepared by ion exchange method for NO oxidation to NO2
Abstract

Co/KxTi2O5 catalysts prepared by ion exchange method were tested for NO oxidation to NO2. Their catalytic activities are similar to Pt-based catalysts and much higher than Co impregnated on TiO2 with or without doped K. The conversion pattern shows a typical kinetic control at low temperatures and thermodynamic control at higher temperatures, exhibiting a peak temperature at which the conversion becomes a maximum. Conversion decreases sharply as oxygen concentration decreases below 1.0%. NO concentration shows a positive effect on the conversion. The presence of Co3O4 and K ion remaining in KxTi2O5 after the ion exchange is responsible for the observed catalytic activity. Thus, Co/KxTi2O5 having a complete ion exchange with little K is not active for the reaction. Unlike Pt-based catalyst, the presence of NO2 does not inhibit catalytic activity. Co/KxTi2O5 was resistant to the presence of SO2 less than 10 ppm. High-NO oxidation activity and high resistance to SO2 and NO2 make Co/KxTi2O5 a promising catalyst for NO oxidation.

Keywords
NO oxidation; Co/KxTi2O5; Co/TiO2; SO2 poisoning
First Page Preview
Co/KxTi2O5 catalysts prepared by ion exchange method for NO oxidation to NO2
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 79, Issue 2, 28 February 2008, Pages 101–107
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis