Improvement in Low Temperature CO Oxidation Activity of CuOx/CeO2−δ by Cs2O Doping: Mechanistic Aspects

Waikar, Jyoti; Lavande, N.R.; More, R.K.; More, Pavan

doi:10.1007/s10563-020-09310-8

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…Ce 3+ /Ce 4+ has a noteworthy increasing trend with the Cu's increment in the structure, indicating the presence of more Ce 3+ and the oxygen vacancy amount playing a significant function in the oxidation reaction, as previously mentioned. 41,42 Fig. 3e-i illustrate O 1s' XPS spectra for the as-prepared samples in their BE regions.…”

Section: Elemental Composition and Oxidation State Analysismentioning

confidence: 99%

Low-temperature deep oxidation of N,N-dimethylformamide (DMF) over CeCu binary oxides

Monguen

Daniel

Tian

2023

Catal. Sci. Technol.

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Section: Elemental Composition and Oxidation State Analysismentioning

confidence: 99%

Low-temperature deep oxidation of N,N-dimethylformamide (DMF) over CeCu binary oxides

Monguen

Daniel

Tian

2023

Catal. Sci. Technol.

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“…In our previous study, Mg-modified MnCe and Cs and/or Mg-modified CuCe catalyst reported for CO oxidation separately [72,73]. Lavande et al [72,74] prepared Mg-doped Mn and Cu-modified CeO 2 (MnCe and CuCe) for complete CO oxidation. The concentration of Mg doping on MnCe and CuCe has been optimized for CO oxidation.…”

Section: Effect Of Am and Aem Doping On Noble Metal (M) Mixed With/supported On Ceo 2 On Co Oxidationmentioning

confidence: 99%

“…Light off, T 50% and T 100% CO conversion temperature of Mg-modified MnCe (0.5:0.5 mol) and Mg-and Cs-modified CuCe (0.15:0.185 mol)[72][73][74]. However, 0.125 wt% Mg-doped MnCe catalyst showed higher CO oxidation at light-off temperature compared to the 6 wt% MgCuCe.…”

mentioning

confidence: 91%

Low temperature oxidation of CO using alkali- and alkaline-earth metal-modified ceria-supported metal catalysts: a review

Waikar

2021

Bull Mater Sci

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The present review devoted to the complete oxidation of CO using alkali-and alkaline-earth metal (AM/AEM)-modified ceria supported/mixed with noble metal and non-noble metal (NM). The AM/AEM-modified Ce supported/mixed with noble metal showed comparable CO oxidation with unmodified catalyst. However, AM/AEMmodified NM showed higher CO oxidation at lower temperature compared to the unmodified catalyst. The AM and AEM modifications were responsible for the formation of oxygen vacancies in Ce, which leads to the decrease in the CO and O 2 activation barrier. The dissociative oxygen adsorption on AM/AEM-modified Ce-supported/mixed with NM favours the CO oxidation at a lower temperature. However, AM/AEM-modified Ce-supported/mixed with noble metal showed CO adsorption with formation of superoxy and peroxy species, which leads to the comparable oxidation activity. The plausible mechanism for CO oxidation is explained in detail with correlation to the characterizations.

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“…To improve the activity of Cu-Ce composite oxide catalyst, the addition of a third component has been usually adopted, such as alkali metal Cs (Waikar et al 2020); alkali earth metal Mg (Waikar et al 2021); transition metals such as Zr (Wang et al 2021), Co (Liu et al 2014), Mn (Lin et al 2018) and Fe (Ma et al 2011); rare earth metals such as La, Pr, Sm (Reddy et al 2012), precious metals such as Ag (Kim et al 2019), Ru (Cui et al 2014), Pd (Cwele et al 2016) and Pt (Wu et al 2018), etc. For example, Kim et al (2019) reported that the addition of Ag reduced the temperature for complete conversion of CO (T 100 ) of Cu-Ce mixed oxide from 120 to 100 o C. Similarly, Wu et al (2018) found that the addition of Pt decreased the T 100 of Cu-Ce mixed oxide for the catalytic oxidation of CO from > 100 o C to 85 o C.…”

Section: Introductionmentioning

confidence: 99%

CO oxidation over Cu-Ce binary oxide prepared by solvothermal method: Effects of cerium precursors on the properties and catalytic behavior

Jin

Liu

et al. 2022

Preprint

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Cu-Ce binary oxides were prepared by one-pot solvothermal method, and the effects of different cerium precursors (cerium nitrate and cerium ammonium nitrate) on the catalytic activity and resistance to water vapor or CO2 of the prepared samples for low-temperature CO oxidation reaction were investigated. The physico-chemical characteristics of the catalysts were characterized by thermal analyses (TG-DSC), X-ray diffraction (XRD), Raman spectroscopy, N2 adsorption-desorption, inductively coupled plasma-atomic emission spectrometry (ICP-AES), X-ray photoelectron spectroscopy (XPS), in-situ diffuse reflectance infrared Fourier transform spectroscopy (in-situ DRIFTs), temperature-programmed reduction with H2 (H2-TPR), and temperature-programmed desorption of adsorbed O2 (O2-TPD). The results indicated that the CuO-CeO2 catalyst (CC-N) prepared with cerium nitrate showed higher activity for low-temperature CO oxidation, which can be ascribed to its larger specific surface area and pore volume, more amounts of highly dispersed CuO species with strong interaction with CeO2, Cu+ species, and more active surface oxygen species, compared with the counterpart prepared with cerium ammonium nitrate (CC-NH). Furthermore, the CC-N catalyst also exhibited better resistance to CO2 poisoning than CC-NH.

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Improvement in Low Temperature CO Oxidation Activity of CuOx/CeO2−δ by Cs2O Doping: Mechanistic Aspects

Cited by 7 publications

References 34 publications

Low-temperature deep oxidation of N,N-dimethylformamide (DMF) over CeCu binary oxides

Low-temperature deep oxidation of N,N-dimethylformamide (DMF) over CeCu binary oxides

Low temperature oxidation of CO using alkali- and alkaline-earth metal-modified ceria-supported metal catalysts: a review

CO oxidation over Cu-Ce binary oxide prepared by solvothermal method: Effects of cerium precursors on the properties and catalytic behavior

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