Nanostructured manganese doped ceria solid solutions for CO oxidation at lower temperatures

Venkataswamy, Perala; Rao, Komateedi N.; Jampaiah, Deshetti; Reddy, Benjaram M.

doi:10.1016/j.apcatb.2014.06.038

Cited by 283 publications

(200 citation statements)

References 60 publications

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“…It was found that the lattice parameter of MC (5.35 ± 0.01Å) was smaller than that of the pure CeO 2 (5.41 ± 0.01Å). A smaller lattice parameter is attributed to the substitution of larger Ce 4+ (0.99Å) with smaller Mn x+ (Mn 2+ = 0.83Å; Mn 3+ = 0.65Å; Mn 4+ = 0.53Å) cations [27] in the CeO 2 fluorite structure, as the crystal structure of their corresponding oxides are comparable to each other [20,28]. Similarly, the addition of Sn to is smaller than that of Ce 4+ (0.99Å), it would be expected that the lattice parameter of SMC should either remain constant or slightly decrease if Pd ions enter into the ceria lattice [9,29].…”

Section: Structure and Surface Analysismentioning

confidence: 99%

Pd supported on SnO2–MnO –CeO2 catalysts for low temperature CO oxidation

et al. 2015

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Section: Structure and Surface Analysismentioning

confidence: 99%

Pd supported on SnO2–MnO –CeO2 catalysts for low temperature CO oxidation

et al. 2015

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“…These bands can be attributed to lattice oxygen (O lat ), 42,43 surface-absorbed oxygen stemmed from oxygen vacancies (O sur ), 42 48 Thus, surface-absorbed oxygen stemmed from the oxygen vacancies has higher mobility than lattice oxygen 18,49 and greatly influences the redox property of catalyst. 50 In Table 1 Samples of Mn 3 O 4 , FeMnO x , and FeO x were further characterized by Raman spectroscopy, which is powerful tool to probe vibrational behavior of lattices and hence probe structural differences in oxides, as displayed in Figure 4 3.1.4.…”

Section: Methodsmentioning

confidence: 99%

Sphere-Shaped Mn₃O₄ Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Pan

Jian

Chen

et al. 2017

Environ. Sci. Technol.

177

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Mn 3 O 4 , FeMnO x , and FeO x catalysts synthesized via a solvothermal method were employed for catalytic oxidation of methyl−ethyl−ketone (MEK) at low temperature. Mn 3 O 4 with sphere-like morphology exhibited the highest activity for MEK oxidation, over which MEK was completely oxidized to CO 2 at 200°C, and this result can be comparable to typical noble metal loaded catalysts. The activation energy of MEK over Mn 3 O 4 (30.8 kJ/mol) was much lower than that of FeMnO x (41.5 kJ/mol) and FeO x (47.8 kJ/mol). The dominant planes, surface manganese species ratio, surface-absorbed oxygen, and redox capability played important roles in the catalytic activities of catalysts, while no significant correlation was found between specific surface area and MEK removal efficiency. Mn 3 O 4 showed the highest activity, accounting for abundant oxygen vacancies, low content of surface Mn 4+ and strong reducibility. The oxidation of MEK to CO 2 via an intermediate of diacetyl is a reaction pathway on Mn 3 O 4 catalyst. Due to high efficiency and low cost, sphere-shaped Mn 3 O 4 is a promising catalyst for VOCs abatement.

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“…[7][8][9] However, this technology has a few drawbacks such as high operation expenses, poor capacity, narrow temperature range of application, and slow adsorption and regeneration rates. 15 Several metal oxides such as CuO, Cu 2 O, MnO x , Fe 2 O 3 , TiO 2 , VO x /TiO 2 , and Co/TiO 2 have already been investigated for the catalytic Hg 0 oxidation reaction (Hg 0 / Hg 2+ ). 11 It is well-known that coal-red power plants emit Hg 0 into the environment during the combustion processes that occur at high temperatures (up to 1700 K).…”

Section: Introductionmentioning

confidence: 99%

Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO₂–MnO_x catalyst

et al. 2015

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A nanostructured CeO 2 -MnO x catalyst was synthesized by a coprecipitation method and subjected to different calcination temperatures at 773 and 1073 K to understand the surface structure and the thermal stability. The structural and redox properties were deeply investigated by various techniques, namely, Xray diffraction (XRD), inductively coupled plasma-optical emission spectroscopy (ICP-OES), Brunauer-Emmett-Teller (BET) surface area, transmission electron microscopy (TEM), Raman spectroscopy (RS), hydrogen-temperature programmed reduction (H 2 -TPR), and X-ray photoelectron spectroscopy (XPS). The CeO 2 -MnO x catalyst calcined at 773 K was tested towards elemental mercury (Hg 0 ) oxidation and the achieved results are compared with the pure CeO 2 and MnO x . The XRD and TEM results confirmed the incorporation of Mn ions into the ceria lattice and the formation of a nanostructured solid solution, respectively. The RS and TPR results showed that the CeO 2 -MnO x catalyst exhibits more oxygen vacancies with superior redox ability over CeO 2 and MnO x . XPS analysis indicates that Ce and Mn existed in multiple oxidation states. Compared to pure CeO 2 and MnO x , the CeO 2 -MnO x catalyst exhibited greater Hg 0 oxidation efficiency (E oxi ) of 11.7, 33.5, and 89.6% in the presence of HCl, O 2 , and HCl/O 2mix conditions, respectively. The results clearly indicated that the HCl/O 2 -mix had a promotional effect on the catalytic Hg 0 oxidation. This was most likely due to the presence of surface oxygen species and oxygen vacancies being generated by a synergetic effect between CeO 2 and MnO x . In the presence of HCl, the CeO 2 -MnO x catalyst exhibited good adsorption efficiency (E ads ) of 92.4% over pure CeO 2 (46.5%) and MnO x (80.6%). It was found that increasing the operating temperature from 423 to 573 K resulted in considerable increase of E oxi and a decrease in the sorption of Hg 0 on the catalyst. .in; Tel: +61 3 9925 3365 † Electronic supplementary information (ESI) available: The chemical compositions of CeO 2 -MnO x mixed oxides, binding energies of spent catalysts, experimental diagram, calibration experiments for Hg 0 inlet , Ce 3d, O 1s, Mn 2p, Hg 4f and Cl 2p XPS spectra of spent catalysts calcined at 773 K. See

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Nanostructured manganese doped ceria solid solutions for CO oxidation at lower temperatures

Cited by 283 publications

References 60 publications

Pd supported on SnO2–MnO –CeO2 catalysts for low temperature CO oxidation

Pd supported on SnO2–MnO –CeO2 catalysts for low temperature CO oxidation

Sphere-Shaped Mn₃O₄ Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO₂–MnO_x catalyst

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Nanostructured manganese doped ceria solid solutions for CO oxidation at lower temperatures

Cited by 283 publications

References 60 publications

Pd supported on SnO2–MnO –CeO2 catalysts for low temperature CO oxidation

Pd supported on SnO2–MnO –CeO2 catalysts for low temperature CO oxidation

Sphere-Shaped Mn3O4 Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO2–MnOx catalyst

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Sphere-Shaped Mn₃O₄ Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO₂–MnO_x catalyst