Balancing surface acidity, oxygen vacancies and Cu+ of CuOx/CeO2 catalysts by Nb doping for enhancing CO oxidation and moisture resistance and lowering byproducts in plasma catalysis

被引：26

作者：

Zhang, Jian ^{[1
]}

Wang, Lisha ^{[1
]}

Hu, Xueyu ^{[1
]}

Shao, Qi ^{[1
]}

Xu, Xiaoming ^{[2
]}

Long, Chao ^{[1
,3
]}

机构：

[1] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, 163 Xianlin Ave, Nanjing 210023, Peoples R China

[2] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China

[3] Nanjing Univ, Quanzhou Inst Environm Protect Ind, Beifeng Rd, Quanzhou 362000, Peoples R China

来源：

JOURNAL OF CLEANER PRODUCTION | 2021年 / 318卷

基金：

中国国家自然科学基金;

关键词：

Cu/Ce-based catalysts; Plasma catalysis; Moisture resistance; Ozone byproduct; CARBON-MONOXIDE; PREFERENTIAL OXIDATION; CERIA CATALYSTS; COPPER; PERFORMANCE; CEO2; NOX; REGENERATION; MECHANISMS; DISCHARGE;

D O I：

10.1016/j.jclepro.2021.128564

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The development of a non-noble metal catalyst is a challenging task in plasma catalysis to achieve high CO conversion and low amount of by-products (O-3 and NOx) under low energy input and high humidity conditions. In this study, we have prepared several Nb-doped CuOx/CeNbOx catalysts with various Ce/Nb molar ratios. Among them, CuOx/Ce(0.9)Nb(0.1)Ox catalyst exhibited the highest CO conversion (90%) and the lowest byproduct emissions (O-3 < 5 ppm; NOx < 20 ppm) at low energy density (similar to 600 J/L) in plasma catalytic CO oxidation. Furthermore, it remained good stability under moisture-rich conditions (5.2% H2O). We employed XPS, UV-Raman, O-2-TPD, NH3-TPD and in situ DRIFTS to elucidate the origin of enhancement effects. It was found that the appropriate amount of niobium doping well balanced the relationship among Cu+, oxygen vacancies and surface acidity, and inhibited the competitive adsorption of H2O. The findings can provide an avenue to solve the problems of incomplete oxidation and by-product emissions in the application of plasma technology.

引用

页数：13

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