Superior DeNO (x) activity of V2O5-WO3/TiO2 catalysts prepared by deposition-precipitation method | Health & Environmental Research Online (HERO)

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Citation
Tags

HERO ID

3752902

Reference Type

Journal Article

Title

Superior DeNO (x) activity of V2O5-WO3/TiO2 catalysts prepared by deposition-precipitation method

Author(s)

Putluru, SSR; Schill, L; Gardini, D; Mossin, S; Wagner, JB; Jensen, AD; Fehrmann, R

Year

2014

Is Peer Reviewed?

Yes

Journal

Journal of Materials Science
ISSN: 0022-2461
EISSN: 1573-4803

Volume

Issue

Page Numbers

2705-2713

Language

English

DOI

10.1007/s10853-013-7926-0

Web of Science Id

WOS:000330791400003

Abstract

V2O5-WO3/TiO2 catalysts were prepared by incipient wetness impregnation and deposition-precipitation (DP) methods. The catalysts were characterized by N-2 physisorption, X-ray powder diffraction, Fourier transform infra red spectroscopy, electron paramagnetic resonance spectroscopy, transmission electron microscopy, H-2-temperature programmed reduction and NH3-temperature programmed desorption. The catalysts exhibited only crystalline TiO2 phases with the active metal and promoter in highly dispersed or amorphous state. The 3 wt% V2O5-10 wt% WO3/TiO2 catalyst prepared by DP using ammonium carbamate as a precipitating agent was found to be the most active and selective to N-2. The superior activity of the catalyst can be ascribed to the altered acidic and redox properties of vanadium. The catalysts did not show increased potassium resistance with the change in preparation method or with increasing vanadium concentration. Furthermore, potassium-poisoned catalysts showed above stoichiometric loss of surface acidity. Thus, these modified formulations are suggested to be used in coal/natural gas-fired power plants where there is a demand for high selective catalytic reduction activity and selectivity to N-2.

Keywords

Deposition precipitation methods; Electron paramagnetic resonance spectroscopy; Fourier transform infra reds; Gas-fired power plants; Incipientwetness impregnation; Precipitating agents; Temperature-programmed reduction; Vanadium concentration; Deposition; Electron spin resonance spectroscopy; Metals; Potassium; Precipitation (chemical); Selective catalytic reduction; Temperature programmed desorption; Titanium dioxide; Transmission electron microscopy; Vanadium; X ray powder diffraction; Catalyst activity