Catalytic performance of highly dispersed WO3 loaded on CeO2 in the selective catalytic reduction of NO by NH3

doi:10.1016/S1872-2067(17)62887-0

Abstract

Abstract:

The influence of tungsten trioxide (WO₃) loading on the selective catalytic reduction (SCR) of nitric oxide (NO) by ammonia (NH₃) over WO₃/cerium dioxide (CeO₂) was investigated. The NO conversion first rose and then declined with increasing WO₃ loading. It was found that the crystalline WO₃ in the 1.6WO₃/CeO₂ sample could be removed in 25 wt% ammonium hydroxide at 70 ℃, which improved the catalytic activity of the sample. The obtained samples were characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, hydrogen (H₂) temperature programmed reduction, NH₃ temperature programmed desorption, and in situ diffuse reflectance infrared Fourier transform spectroscopy. The results revealed that the dispersed WO₃ promoted the catalytic activity of WO₃/CeO₂ while the crystalline WO₃ inhibited catalytic activity. The oxygen activation of CeO₂ was inhibited by the coverage of WO₃, which weakened NO oxidation and adsorption of nitrate species over WO₃/CeO₂. In addition, the NH₃ adsorption performance on CeO₂ was improved by modification with WO₃. NH₃ was the most stable adsorbed species under NH₃ SCR reaction conditions. In situ DRIFT spectra suggested that the NH₃ SCR reaction proceeded via the Eley-Rideal mechanism over WO₃/CeO₂. Thus, when the loading of WO₃ was close to the dispersion capacity, the effects of NH₃ adsorption and activation were maximized to promote the reaction via the Eley-Rideal route.

Key words: NH₃ selective catalytic reduction, WO₃/CeO₂ catalyst_, WO₃ state, Dispersion capacity, Diffuse reflectance infrared Fourier transform spectroscopy

Lei Zhang, Jingfang Sun, Yan Xiong, Xiaoqing Zeng, Changjin Tang, Lin Dong. Catalytic performance of highly dispersed WO₃ loaded on CeO₂ in the selective catalytic reduction of NO by NH₃[J]. Chinese Journal of Catalysis, 2017, 38(10): 1749-1758.

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Catalytic performance of highly dispersed WO₃ loaded on CeO₂ in the selective catalytic reduction of NO by NH₃

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