Citation: Xiaoshan Feng, Yingbin Zheng, Daifeng Lin, Enhui Wu, Yongjin Luo, Yufeng You, Hun Xue, Qingrong Qian, Qinghua Chen. Novel synthetic route to Ce-Cu-W-O microspheres for efficient catalytic oxidation of vinyl chloride emissions[J]. Chinese Journal of Catalysis, ;2020, 41(12): 1864-1872. doi: 10.1016/S1872-2067(20)63653-1 shu

Novel synthetic route to Ce-Cu-W-O microspheres for efficient catalytic oxidation of vinyl chloride emissions

a Fujian Key Laboratory of Pollution Control & Resource Reuse, Fujian Normal University, Fuzhou 350007, Fujian, China;
b Fuqing Branch of Fujian Normal University, Fuqing 350300, Fujian, China

Received Date: 3 March 2020
Revised Date: 12 April 2020

Fund Project: This work was supported by the National Key Research and Development Program of China (2019YFC1904500), National Natural Science Foundation of China (21875037), and New Century Talent Project of Fujian Province.

The solubility of ammonium tungstate in a special hydrothermal condition is exploited to synthesize uniform microspheres of Ce-Cu-W-O oxides. Compared to their W-undoped counterparts, they possess more Ce³⁺ and oxygen vacancies, thereby promoting oxygen mobility. The formed rich WO₃ surface can effectively provide acid sites, which is helpful for adsorption of vinyl chloride and interrupting the C-Cl bond. In addition, the presence of WO₃ induces the formation of finer CuO nanoparticles with respect to the traditional coprecipitation method, thereby resulting in a better reducibility. Benefiting from both the enhanced acidity and reducibility, the Ce-Cu-W-O microspheres deliver excellent low-temperature vinyl chloride oxidation activity (a reaction rate of 2.01×10^-7 mol/(g_cat·s) at 250 ℃) and high HCl selectivity. Moreover, subtle deactivation occurs after the three cycling activity tests, and a stable vinyl chloride conversion as well as mineralization are observed during the 72-h durability test at 300 ℃, which demonstrates good thermal stability. Our strategy can provide new insights into the design and synthesis of metal oxides for catalytic oxidation of chlorinated volatile organic compounds.
- Catalytic vinyl chloride oxidation,
- Ce-Cu-W-Omicrospheres,
- Solubility of ammonium tungstate,
- Rich surface WO₃,
- Fine CuO nanoparticles
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