Application of ReOx/TiO2 catalysts with excellent SO2 tolerance for the selective catalytic reduction of NOx by NH3

Yanke Yu; Xianfang Yi; Jiali Zhang; Zhaojian Tong; Changwei Chen; Mudi Ma; Chi He; Jinxiu Wang; Jinsheng Chen; Bingbing Chen

doi:10.1039/D1CY00467K

Application of ReO_x/TiO₂ catalysts with excellent SO₂ tolerance for the selective catalytic reduction of NO_x by NH₃†

Yanke Yu,

^a Xianfang Yi,^b Jiali Zhang,^ac Zhaojian Tong,^ac Changwei Chen,^a Mudi Ma,^a Chi He,

*^ad Jinxiu Wang,

^b Jinsheng Chen

*^b and Bingbing Chen^e

Author affiliations

* Corresponding authors

^a Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China
E-mail: chi_he@xjtu.edu.cn

^b Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, P. R. China
E-mail: jschen@iue.ac.cn

^c College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, P.R. China

^d National Engineering Laboratory for VOCs Pollution Control Material & Technology, University of Chinese Academy of Sciences, Beijing 101408, P.R. China

^e Department of Energy Science and Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, P. R. China

Abstract

Non-vanadium-based catalysts with high SO₂ tolerance are still interesting in selective catalytic reduction of NO by NH₃ (NH₃-SCR) and SO₂ adsorption is the foremost step for the deactivation of catalysts. In order to alleviate the adsorption of SO₂, we fabricated a series of rhenium (Re; without stable sulfate) supported TiO₂ catalysts and studied their SO₂ tolerance for the first time. Owing to suitable surface acidity and reducibility, ReO_x/TiO₂ catalysts exhibited satisfactory activity in a wide temperature range of 250–350 °C. As expected, experimental results and DFT calculations indicated that SO₂ adsorption on ReO_x/TiO₂ catalysts was rather weak, thus the catalysts performed excellent SO₂ tolerance in the NH₃-SCR reaction. Moreover, in situ DRIFTS indicated that the NH₃-SCR reaction on ReO_x/TiO₂ catalysts followed the Eley–Rideal mechanism and SO₂ had little effect on the reaction mechanism. Our findings should provide new insights into the development of SCR catalysts with high SO₂ tolerance.

Catalysis Science & Technology

Application of ReO_x/TiO₂ catalysts with excellent SO₂ tolerance for the selective catalytic reduction of NO_x by NH₃†

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Application of ReO_x/TiO₂ catalysts with excellent SO₂ tolerance for the selective catalytic reduction of NO_x by NH₃

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