Catalysts
·
2019
·Vol. 9
·期 9
·724
·
IF 3.444
Yan Cui,Leilei Xu,Mindong Chen,Chufei Lv,Xinbo Lian,Cai-e Wu,Bo Yang,Zhichao Miao,Fagen Wang,Xun Hu
CuO-based catalysts are usually used for CO oxidation owing to their low cost and excellent catalytic activities. In this study, a series of metal oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2)-doped CuO-based catalysts with mesoporous Ce0.8Zr0.2O2support were simply prepared by the incipient impregnation method and used directly as catalysts for CO catalytic oxidation. These mesoporous catalysts were systematically characterized by X-ray powder diffraction (XRD), N2physisorption, transmission electron microscopy (TEM), energy-dispersed spectroscopy (EDS) mapping, X-ray photoelectron spectroscopy (XPS), and H2temperature programmed reduction (H2-TPR). It was found that the CuO and the dopants were highly dispersed among the mesoporous framework via the incipient impregnation method, and the strong metal framework interaction had been formed. The effects of the types of the dopants and the loading amounts of the dopants on the low-temperature catalytic performances were carefully studied. It was concluded that doped transition metal oxides could regulate the oxygen mobility and reduction ability of catalysts, further improving the catalytic activity. It was also found that the high dispersion of rare earth metal oxides (PrO2, Sm2O3) was able to prevent the thermal sintering and aggregation of CuO-based catalysts during the process of calcination. In addition, their presence also evidently improved the reducibility and significantly reduced the particle size of the CuO active sites for CO oxidation. The results demonstrated that the 15CuO-3Fe2O3/M-Ce80Zr20 catalyst with 3 wt. % of Fe2O3showed the best low-temperature catalytic activity toward CO oxidation. Overall, the present Fe2O3-doped CuO-based catalysts with mesoporous nanocrystalline Ce0.8Zr0.2O2solid solution as support were considered a promising series of catalysts for low-temperature CO oxidation.Keywords:CuO-based catalyst;Fe2O3dopant;mesoporous Ce0.8Zr0.2O2solid solution;low-temperature catalytic activity;CO oxidation
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 3
·588
·
IF 3.9
Haiou Zhang,Yixin Zhang,Huikang Song,Yan Cui,Yingying Xue,Cai-e Wu,Chao Pan,Jingxin Xu,Jian Qiu,Leilei Xu,Mindong Chen
As a toxic pollutant, carbon monoxide (CO) usually causes harmful effects on human health. Therefore, the thermally catalytic oxidation of CO has received extensive attention in recent years. The CuO-based catalysts have been widely investigated due to their availability. In this study, a series of transition metal oxides (Fe2O3, Co3O4and NiO) promoted CuO-based catalysts supported on the α-MnO2nanowire catalysts were prepared by the deposition precipitation method for catalytic CO oxidation reactions. The effects of the loaded transition metal type, the loading amount, and the calcination temperature on the catalytic performances were systematically investigated. Further catalyst characterization showed that the CuO/α-MnO2catalyst modified with 3 wt% Co3O4and calcined at 400 °C performed the highest CO catalytic activity (T90= 75 °C) among the investigated catalysts. It was supposed that the loading of the Co3O4dopant not only increased the content of oxygen vacancies in the catalyst but also increased the specific surface area and pore volume of the CuO/α-MnO2nanowire catalyst, which would further enhance the catalytic activity. The CuO/α-MnO2catalyst modified with 3 wt% NiO and calcined at 400 °C exhibited the highest surface adsorbed oxygen content and the best normalized reaction rate, but the specific surface area limited its activity. Therefore, the appropriate loading of the Co3O4modifier could greatly enhance the activity of CuO/α-MnO2. This research could provide a reference method for constructing efficient low-temperature CO oxidation catalysts.Keywords:transition metal oxides;CuO-based catalysts;Co3O4modification;α-MnO2nanowire;catalytic oxidation of CO
研究领域:
催化
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 20
·5605-5625
·
IF 5.726
Yan Cui,Leilei Xu,Mindong Chen,Xinbo Lian,Cai-e Wu,Bo Yang,Zhichao Miao,Fagen Wang,Xun Hu
A series of mesoporous nanocrystalline Ce–Zr solid solutions with different Ce/Zr ratios were successfully synthesized by the evaporation-induced self-assembly strategy, and were employed as catalytic supports of CuO-based catalysts for CO oxidation. These supports and catalysts were systematically characterized by X-ray powder diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), energy-dispersed spectroscopy (EDS) mapping, X-ray photoelectron spectroscopy (XPS), H2 temperature programmed reduction (H2-TPR), CO2 temperature programmed desorption (CO2-TPD), etc. The catalytic performances toward CO oxidation had been carefully evaluated over these CuO-based catalysts. The effects of various influencing factors, such as the Ce/Zr ratio, mesostructure, redox properties of the support, CuO loading amount and calcination temperature, on the low-temperature catalytic activity had been carefully investigated. The results showed that the catalyst supported on the support with a Ce/Zr ratio of 80/20 exhibited the highest catalytic activity. It was also found that the Ce–Zr solid solution mesoporous catalysts exhibited much higher catalytic activity than the counterparts without evident mesostructure, demonstrating the advantages of the mesoporous catalysts by providing more accessible catalytically active sites. Besides, the mesoporous Ce–Zr solid solution-supported catalysts with excellent redox properties displayed much better catalytic performances than the commercial γ-Al2O3-supported catalyst. The kinetic study also indicated that the apparent activation energy of the CO oxidation process was greatly affected by the Ce/Zr ratio, mesostructure, and redox properties of the support. Overall, the present CuO-based catalysts with mesoporous nanocrystalline Ce–Zr solid solutions as supports were considered as a series of promising catalysts for CO oxidation.
研究领域:
催化
·
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）