Design Strategies for Development of SCR Catalyst: Improvement of Alkali Poisoning Resistance and Novel Regeneration Method
- 1 November 2012
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 46 (22), 12623-12629
- https://doi.org/10.1021/es302857a
Abstract
Based on the ideas of the additives modification and regeneration method update, two different strategies were designed to deal with the traditional SCR catalyst poisoned by alkali metals. First, ceria doping on the V(2)O(5)-WO(3)/TiO(2) catalyst could promote the SCR performance even reducing the V loading, which resulted in the enhancement of the catalyst's alkali poisoning resistance. Then, a novel method, electrophoresis treatment, was employed to regenerate the alkali poisoned V(2)O(5)-WO(3)/TiO(2) catalyst. This novel technique could dramatically enhance the SCR activities of the alkali poisoned catalysts by removing approximately 95% K or Na ions from the catalyst and showed less hazardous to the environment. Finally, the deactivation mechanisms by the alkali metals were extensively studied by employing both the experimental and DFT theoretical approaches. Alkali atom mainly influences the active site V species rather than W oxides. The decrease of catalyst surface acidity might directly reduce the catalytic activity, while the reducibility of catalysts could be another important factor.Keywords
This publication has 29 references indexed in Scilit:
- Theoretical and experimental study on the deactivation of V2O5 based catalyst by lead for selective catalytic reduction of nitric oxidesCatalysis Today, 2011
- Brønsted-NH4+ mechanism versusnitrite mechanism: new insight into the selective catalyticreduction of NO by NH3Physical Chemistry Chemical Physics, 2010
- NO and NO2Adsorption on Al2O3and Ga Modified Al2O3Surfaces: A Density Functional Theory StudyThe Journal of Physical Chemistry C, 2010
- Role of Hydroxyl Groups in the NHx (x = 1−3) Adsorption on the TiO2 Anatase (101) Surface Determined by a First-Principles StudyLangmuir, 2010
- Chemical deactivation of V2O5/WO3–TiO2 SCR catalysts by additives and impurities from fuels, lubrication oils, and urea solution: I. Catalytic studiesApplied Catalysis B: Environment and Energy, 2008
- Effect of Alkali Doping on a V2O5/TiO2Catalyst from Periodic DFT CalculationsThe Journal of Physical Chemistry C, 2007
- Molecular structure and catalytic activity of V2O5/TiO2 catalysts for the SCR of NO by NH3: In situ Raman spectra in the presence of O2, NH3, NO, H2, H2O, and SO2Journal of Catalysis, 2006
- Regeneration of commercial SCR catalysts by washing and sulphation: effect of sulphate groups on the activityApplied Catalysis B: Environment and Energy, 2001
- From molecules to solids with the DMol3 approachThe Journal of Chemical Physics, 2000
- Chemical and mechanistic aspects of the selective catalytic reduction of NO by ammonia over oxide catalysts: A reviewApplied Catalysis B: Environment and Energy, 1998