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Promoting effect of calcium doping on the performances of MnOx/TiO2 catalysts for NO reduction with NH3 at low temperature

Paper ID Volume ID Publish Year Pages File Format Full-Text
45980 46428 2013 9 PDF Available
Title
Promoting effect of calcium doping on the performances of MnOx/TiO2 catalysts for NO reduction with NH3 at low temperature
Abstract

In this paper, the Ca doped MnOx/TiO2 catalysts were synthesized through a sol–gel method, which exhibited promoting effects on selective catalytic reduction (SCR) of NO with NH3 at low temperature. The NO conversion of MnOx/TiO2 had been greatly improved from ca. 40% to 90% at 140 °C after Ca doping. After the catalysts being subjected to a variety of analytical measurements, we observed that the addition of Ca could result in better dispersion of MnOx on TiO2, leading to the enhancement of BET surface area and pore volume. This could be attributed to the strong interactions among calcium, manganese oxides and titania. Furthermore, an obvious increase in the amounts of ad-NOx species, especially monodentate nitrate and NO2− species, was also observed. All of these would give the contributions to the great improvement of catalytic activity by the addition of Ca.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The addition of Ca has strong promoting effect on low temperature SCR activity over MnOx/TiO2. ► The strong interaction after Ca doping leads to the increase in surface area and dispersion. ► The doping of Ca greatly increases the adsorption and oxidation of NO.

Keywords
NH3-SCR; Low temperature; Ca doping; MnOx/TiO2
First Page Preview
Promoting effect of calcium doping on the performances of MnOx/TiO2 catalysts for NO reduction with NH3 at low temperature
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 129, 17 January 2013, Pages 30–38
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis