Promotive Effect of SO2 on the Activity of a Deactivated Commercial Selective Catalytic Reduction Catalyst: An in situ DRIFT Study

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• 作者：Yanke Yu ; Jinxiu Wang ; Jinsheng Chen ; Xiaoran Meng ; Yanting Chen ; Chi He
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：October 22, 2014
• 年：2014
• 卷：53
• 期：42
• 页码：16229-16234
• 全文大小：368K
• ISSN：1520-5045

文摘

The deposition of K can lead to deactivation of commercial V₂O₅鈥揥O₃/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 Br酶nsted acid sites and the activity of the catalyst significantly.