Characterization and activity of V2O5-CeO2/TiO2-ZrO2 catalysts for NH3-selective catalytic reduction of NOx

doi:10.1016/S1872-2067(14)60916-0

Abstract

Abstract:

A series of V₂O₅-xCeO₂/TiO₂-ZrO₂ (Ti-Zr) catalysts with different CeO₂ loadings (x = molar ratio of Ce/Ti-Zr) were prepared, and their catalytic performance for the selective catalytic reduction (SCR) of NO_x by NH₃ was investigated in the presence of SO₂ and H₂O. The physicochemical properties of the catalysts were characterized by N₂ sorption analysis, high-resolution transmission electron microscopy, X-ray diffraction, H₂-temperature-programmed reduction, NH₃-temperature- programmed desorption, and in situ diffuse reflectance infrared Fourier transform spectroscopy. The presence of CeO₂ in the catalysts led to higher conversion of NO_x within a wider operating temperature range. V₂O₅-xCeO₂/Ti-Zr catalyst (x = 0.2) exhibited the highest activity. Higher loadings of CeO₂ adversely affected the NO_x conversion at higher temperatures. The characterization results revealed that CeO₂ was amorphous and highly dispersed over the Ti-Zr support. The catalysts featured single-crystal electron diffraction features. The presence of CeO₂ significantly increased the reduction ability of the catalysts, and low V₂O₅ loadings were beneficial to the low-temperature SCR. V₂O₅/TiO₂ catalyst exhibited medium-to-strong and strong acid desorption of NH₃, whereas V₂O₅/Ti-Zr featured weak acid sites onto which desorption of NH₃ occurred. The presence of CeO₂ could increase the amount of both the Brönsted and Lewis acid sites, which were expected to play a key role in the excellent SCR activity. In contrast, the presence of V₂O₅ reduced the amount of Brönsted acid sites. All V₂O₅-CeO₂/Ti-Zr catalysts exhibited poor stability and weak resistance to H₂O poisoning but high resistance to SO₂. However, the original catalytic activity of V₂O₅-xCeO₂/Ti-Zr (x = 0.3) could be fully restored following poisoning with SO₂and H₂O. For the poisoned catalysts, the formation of Ce(SO₄)₂ led to the decreased catalytic performance at the intermediate temperatures, which increased at the higher temperatures because of the presence of V₂O₅.

Key words: Ceria, Titania-zirconium, Acid site, Nitrogen oxide, Selective catalytic reduction, Poisoning

Yaping Zhang, Wanqiu Guo, Longfei Wang, Min Song, Linjun Yang, Kai Shen, Haitao Xu, Changcheng Zhou. Characterization and activity of V₂O₅-CeO₂/TiO₂-ZrO₂ catalysts for NH₃-selective catalytic reduction of NO_x[J]. Chinese Journal of Catalysis, 2015, 36(10): 1701-1710.

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Characterization and activity of V₂O₅-CeO₂/TiO₂-ZrO₂ catalysts for NH₃-selective catalytic reduction of NO_x

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