1. Promotive Effect of SO2 on the Activity of a Deactivated Commercial Selective Catalytic Reduction Catalyst: An in situ DRIFT Study
- Author
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Jinsheng Chen, Yanting Chen, Chi He, Jinxiu Wang, Xiaoran Meng, and Yanke Yu
- Subjects
inorganic chemicals ,Chromatography ,Diffuse reflectance infrared fourier transform ,organic chemicals ,General Chemical Engineering ,Inorganic chemistry ,Vanadium ,chemistry.chemical_element ,Selective catalytic reduction ,General Chemistry ,Industrial and Manufacturing Engineering ,Catalysis ,chemistry.chemical_compound ,Adsorption ,chemistry ,heterocyclic compounds ,Sulfate ,Brønsted–Lowry acid–base theory ,Titanium - Abstract
The deposition of K can lead to deactivation of commercial V2O5–WO3/TiO2 selective catalytic reduction (SCR) catalyst while the presence of SO2 largely increases the activity of K-poisoned catalyst. For revealing the mechanism of the SO2 effect on the SCR reaction, the K-poisoned catalyst was prepared by impregnation of KNO3 solution and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was carried out on the fresh and K-poisoned catalyst. The results showed that the adsorption of SO2 in the presence of O2 was different between fresh and K-poisoned catalyst. The tridentate sulfate was formed with titanium in the fresh catalyst. While on the K-poisoned catalyst, the bidentate sulfate was likely formed with vanadium, which increased the number of Bronsted acid sites and the activity of the catalyst significantly.
- Published
- 2014
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