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

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

a. School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404000, China;
b. Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, Jiangsu, China;
c. College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, Henan, China

Received Date: 31 May 2017
Revised Date: 6 July 2017

Fund Project: This work was supported by the National Natural Foundation of China (21607019, 21503115), the Open Project Program of Jiangsu Key Laboratory of Vehicle Emissions Control (OVEC013), and the Talent Introduction Project of Chongqing Three Gorges University.

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.
- NH₃ selective catalytic reduction,
- WO₃/CeO₂ catalyst,
- WO₃ state,
- Dispersion capacity,
- Diffuse reflectance infrared Fourier transform spectroscopy
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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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