Articles & Issues

Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received July 31, 2008
Accepted October 30, 2008

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

All issues

Effects of preparation methods for V2O5-TiO2 aerogel catalysts on the selective catalytic reduction of NO with NH3

Min Kang¹ Jinsoon Choi^{2 3} Yong Tae Kim² Eun Duck Park² Chee Burm Shin² Dong Jin Suh³ Jae Eui Yie^1†

¹Department of Applied Chemistry, Division of Biotechnology and Nanotechnology, Ajou University, Wonchun-dong, Yeongtong-gu, Suwon 443-749, Korea ²Division of Chemical Engineering and Materials Engineering and Division of Energy Systems Research, Ajou University, Wonchun-dong, Yeongtong-gu, Suwon 443-749, Korea ³Clean Technology Research Center, Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Korea

Korean Journal of Chemical Engineering, May 2009, 26(3), 884-889(6), 10.1007/s11814-009-0148-0

Download PDF

Abstract

A series of V2O5-TiO2 aerogel catalysts were prepared by the sol-gel method with subsequent supercritical drying with CO2. The main variables in the sol-gel method were the amounts of V2O5 and when the vanadium precursor was introduced. V2O5-TiO2 xerogel and V2O5/TiO2 (P-25) were also prepared for comparison. The V2O5-TiO2 aerogel catalysts showed much higher surface areas and total pore volumes than V2O5-TiO2 xerogel and impregnated V2O5/TiO2 (P-25) catalysts. The catalysts were characterized by N2 physisorption, X-ray diffraction (XRD), FT-Raman spectroscopy, temperature-programmed reduction with H2 (H2-TPR), and temperature-programmed desorption of ammonia (NH3-TPD). The selective catalytic reduction of NOx with ammonia in the presence of excess O2 was studied over these catalysts. Among various V2O5-TiO2 catalysts, V2O5 supported on aerogel TiO2 showed a wide temperature window exhibiting high NOx conversions. This superior catalytic activity is closely related to the large amounts of strong acidic sites as well as the surface vanadium species with characteristics such as easy reducibility and monomeric and polymeric vanadia surface species.

Keywords

Selective Catalytic Reduction NOx V2O5-TiO2 NH3 Aerogel Catalyst

References

Bosch H, Janssen F, Catal. Today, 2, 369 (1988)
Armor JN, Appl. Catal. B, 1, 221 (1992)
Busca G, Lietti L, Ramis G, Berti F, Appl. Catal. B: Environ., 18(1-2), 1 (1998)
Weckhuysen BM, Keller DE, Catal. Today, 78(1-4), 25 (2003)
Caraba RM, Masters SG, Eriksen KM, Parvulescu VI, Fehrmann R, Appl. Catal. B: Environ., 34(3), 191 (2001)
Pajonk GM, Appl. Catal., 72, 217 (1991)
Cauqui MA, Rodriguez-Iziquierdo JM, J. Non-Cryst. Solids, 147/148, 724 (1992)
Pajonk GM, Catal. Today, 35(3), 319 (1997)
Schneider M, Baiker A, Catal. Today, 35(3), 339 (1997)
Schneider M, Maciejewski M, Tschudin S, Wokaun A, Baiker A, J. Catal., 149(2), 326 (1994)
Engweiler J, Baiker A, Appl. Catal. A: Gen., 120(1), 187 (1994)
Reiche MA, Ortelli E, Baiker A, Appl. Catal. B: Environ., 23(2-3), 187 (1999)
Stark WJ, Wegner K, Pratsinis SE, Baiker A, J. Catal., 197(1), 182 (2001)
Kim MI, Park DW, Park SW, Yang X, Choi JS, Suh DJ, Catal. Today, 111(3-4), 212 (2006)
Went GT, Leu LJ, Rosin RR, Bell AT, J. Catal., 134, 492 (1992)