Study of the surface evolution of nitrogen species on CuO/CeZrO2 catalysts

Radlik, Monika; Adamowska, Malgorzata; Łamacz, Agata; Krztoń, Andrzej; Costa, Patrick Da; Turek, W.

doi:10.1007/s11144-013-0552-7

Cited by 12 publications

(4 citation statements)

References 32 publications

(50 reference statements)

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“…It is known that NO 2 as a powerful oxidant can greatly promote the soot oxidation process. The NO 2 production capacity is affected by the oxidation of gaseous NO and the decomposition capacity of the nitrates stored at low temperatures. − Figure a shows the NO 2 production profiles of the FeCeO 2−δ and BaFeCeO 2−δ catalysts obtained in the NO-TPO experiments. To analyze the effect of the barium loading on the NO oxidation to NO 2 , we compared the catalyst samples with different barium contents.…”

Section: Resultsmentioning

confidence: 99%

Promoting Effects of Barium Substitution on the Catalytic Performances of FeCeO_2−δ for Soot Oxidation

Guan

Huang

et al. 2018

Ind. Eng. Chem. Res.

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In this work, the promoting effects of the introduction of barium to FeCeO 2−δ on soot oxidation were thoroughly studied. A series of FeCeO 2−δ , BaFeCeO 2−δ , and BaCeO 2−δ was prepared by a self-propagating high-temperature synthesis method. The physiochemical properties of catalysts were investigated using Brunauer−Emmett−Teller, X-ray diffraction, transmission electron microscopy, NO temperature-programmed oxidation (NO-TPD), and NO x -TPD analysis. Ba(10%)FeCe displays the best catalytic performance and possesses the lowest soot ignition temperature of 282 °C in the presence of NO. However, FeCeO 2−δ was the most active one, showing the lowest soot ignition temperature of 342 °C in the absence of NO. NO-TPD demonstrates that barium loading in FeCeO 2−δ dramatically improves the NO x adsorption and desorption capacity. In addition, in situ diffuse reflectance infrared Fourier transform spectroscopy indicates that NO can be adsorbed on catalysts' surfaces to form nitrite and nitrate species and that the corresponding nitrates species over BaFeCeO 2−δ are stable at high temperatures, a characteristic that plays a crucial role and ensures the excellent performance of soot oxidation.

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Section: Resultsmentioning

confidence: 99%

Promoting Effects of Barium Substitution on the Catalytic Performances of FeCeO_2−δ for Soot Oxidation

Guan

Huang

et al. 2018

Ind. Eng. Chem. Res.

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“…Our interest in this study is on CuO, a p-type semiconducting material, which has been reported for detection of NO x [9][10][11][12][13][14], CO [12,[15][16][17], H 2 [18][19][20], and ethanol [14,[20][21][22][23][24][25]. CuO has also been studied as a NO x reduction catalyst in SCR [26,27].…”

Section: Introductionmentioning

confidence: 99%

Building Selectivity for NO Sensing in a NOx Mixture with Sonochemically Prepared CuO Structures

Mullen

Dutta

2015

Chemosensors

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Several technologies are available for decreasing nitrogen oxide (NOx) emissions from combustion sources, including selective catalytic reduction methods. In this process, ammonia reacts with nitric oxide (NO) and nitrogen dioxide (NO 2 ). As the stoichiometry of the two reactions is different, electrochemical sensor systems that can distinguish between NO and NO 2 in a mixture of these two gases are of interest. Since NO and NO 2 can be brought to equilibrium, depending on the temperature and the surfaces that they are in contact with, the detection of NO and NO 2 independently is a difficult problem and has not been solved to date. In this study, we explore a high surface area sonochemically prepared CuO as the resistive sensing medium. CuO is a poor catalyst for NOx equilibration, and requires temperatures of 500˝C to bring about equilibration. Thus, at 300˝C, NO and NO 2 retain their levels after interaction with CuO surface. In addition, NO adsorbs more strongly on the CuO over NO 2 . Using these two concepts, we can detect NO with minimal interference from NO 2 , if the latter gas concentration does not exceed 20% in a NOx mixture over a range of 100-800 ppm. Since this range constitutes most of the range of total NOx concentrations in diesel and other lean burn engines, this sensor should find application in selective detection of NO in this combustion application. A limitation of this sensor is the interference with CO, but with combustion in excess air, this problem should be alleviated.

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“…In addition, it can be found from the figure that the M-Ce80Zr20 support showed a broad peak at a higher temperature (620 • C), which can be attributed to the reduction of the surface Ce 4+ . It has been reported that the reduction temperature of CuO species should be lower than that of the free CuO when supported on fluorite-type oxides [34]. Therefore, the reduction peak in the range of 197-323 • C could be ascribed to the reduction of the CuO species, which had a closely synergistic effect on the M-Ce80Zr20 supports.…”

Section: H 2 -Tpr Analysismentioning

confidence: 94%

CO Oxidation over Metal Oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2) Doped CuO-Based Catalysts Supported on Mesoporous Ce0.8Zr0.2O2 with Intensified Low-Temperature Activity

Cui

Chen

et al. 2019

Catalysts

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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 Ce0.8Zr0.2O2 support 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), N2 physisorption, transmission electron microscopy (TEM), energy-dispersed spectroscopy (EDS) mapping, X-ray photoelectron spectroscopy (XPS), and H2 temperature 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 Fe2O3 showed the best low-temperature catalytic activity toward CO oxidation. Overall, the present Fe2O3-doped CuO-based catalysts with mesoporous nanocrystalline Ce0.8Zr0.2O2 solid solution as support were considered a promising series of catalysts for low-temperature CO oxidation.

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Study of the surface evolution of nitrogen species on CuO/CeZrO2 catalysts

Cited by 12 publications

References 32 publications

Promoting Effects of Barium Substitution on the Catalytic Performances of FeCeO_2−δ for Soot Oxidation

Promoting Effects of Barium Substitution on the Catalytic Performances of FeCeO_2−δ for Soot Oxidation

Building Selectivity for NO Sensing in a NOx Mixture with Sonochemically Prepared CuO Structures

CO Oxidation over Metal Oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2) Doped CuO-Based Catalysts Supported on Mesoporous Ce0.8Zr0.2O2 with Intensified Low-Temperature Activity

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Study of the surface evolution of nitrogen species on CuO/CeZrO2 catalysts

Cited by 12 publications

References 32 publications

Promoting Effects of Barium Substitution on the Catalytic Performances of FeCeO2−δ for Soot Oxidation

Promoting Effects of Barium Substitution on the Catalytic Performances of FeCeO2−δ for Soot Oxidation

Building Selectivity for NO Sensing in a NOx Mixture with Sonochemically Prepared CuO Structures

CO Oxidation over Metal Oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2) Doped CuO-Based Catalysts Supported on Mesoporous Ce0.8Zr0.2O2 with Intensified Low-Temperature Activity

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Promoting Effects of Barium Substitution on the Catalytic Performances of FeCeO_2−δ for Soot Oxidation

Promoting Effects of Barium Substitution on the Catalytic Performances of FeCeO_2−δ for Soot Oxidation