Reactive calcination route for synthesis of active Mn–Co 3 O 4 spinel catalysts for abatement of CO–CH 4 emissions from CNG vehicles

Trivedi, Suverna; Прасад, Рам

doi:10.1016/j.jece.2016.01.002

Cited by 40 publications

(38 citation statements)

References 76 publications

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“…Mn +3 to Mn +4 ) or creates some oxygen vacancies to maintain the electrical neutrality [33][34][35][36][37]. The higher oxidation state ions are usually known to possess higher catalytic activity whereas the oxygen vacancies enhance the surface oxygen and oxygen mobility in the lattice and both of these factors lead to increase in the catalytic activity [38][39][40][41].…”

Section: Alkali Metal Substitutionmentioning

confidence: 99%

Simultaneous Control of NOx-Soot by Substitutions of Ag and K on Perovskite (LaMnO3) Catalyst

Dhal

Dey

Прасад

2017

Bull. Chem. React. Eng. Catal.

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The different Ag and K substituted perovskite catalysts including base catalyst were LaMnO3 by the solid state method and the diesel soot was prepared in the laboratory. Their structures and physicochemical properties were characterized by X-ray diffraction (XRD), BET, SEM, H2-TPR, and XPS techniques. The Ag Substituted at A-site perovskite structured catalysts are more active than other type of catalysts for the simultaneous soot-NOx reaction, When Ag and K are simultaneously introduced into LaMnO3 catalyst, soot combustion is largely accelerated, with the temperature (Tm) for maximal soot conversion lowered by at least 50 °C, moreover, NOx reduction by soot is also facilitated. The high activity of La0.65Ag0.35MnO3 perovskite catalyst is attributed to presence of metallic silver in the catalyst. The activity order of Ag doped LaMnO3 is as follows La0.65Ag0.35MnO3 > La0.65Ag0.2MnO3 > La0.65Ag0.4MnO3 > La0.65Ag0.1MnO3. The dual substitution of silver and potassium in place of La in LaMnO3 gives better activity than only silver doped catalyst. In a series of La0.65AgxK1-xMnO3, the optimum substitution amount of K is for x=0.25. The single and doubled substituted perovskite catalyst proved to be effective in the simultaneous removal of NOx and soot particulate, the two prevalent pollutants in diesel exhaust gases in the temperature range 350-480 °C.

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Section: Alkali Metal Substitutionmentioning

confidence: 99%

Simultaneous Control of NOx-Soot by Substitutions of Ag and K on Perovskite (LaMnO3) Catalyst

Dhal

Dey

Прасад

2017

Bull. Chem. React. Eng. Catal.

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“…So, CNG vehicles have been encouraged in New Delhi due to lower emissions. In spite of several merits, the CNG vehicles have some limitations as the tailpipe emissions from the CNG vehicles contain a considerable amount of CO (∼1.6%) and CH 4 (∼0.4‐1%) in addition to other pollutants like formaldehyde and NOx . CO has been termed “the unnoticed poisonof 21 st century” and is often called “the silent killer” because it gives no clear warning to its victims that they were at risk .…”

Section: Introductionmentioning

confidence: 99%

Design of active NiCo₂O_4‐δ spinel catalyst for abatement of CO‐CH₄ emissions from CNG fueled vehicles

2018

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Increasing number of CNG vehicles on road emits considerable amount of CO, a poisonous gas and CH4, a greenhouse‐gas. Highly active and oxygen‐deficient NiCo2O4‐δ spinel and its individual metal‐oxides were synthesized by calcination of precipitated/co‐precipitated basic‐carbonates followed by calcination under different strategies of stagnant air(s), flowing air(f) and reactive calcination(RC) for total oxidation of CO‐CH4 mixture. The catalysts were characterized by XRD, XPS, BET surface‐area, SEM‐EDX and TEM. The performance order of the catalysts for the oxidation of CO‐CH4 mixture was as follows: NiCoRC>NiCof>NiCos>CoRC>Cof>Cos>NiRC> Nif>Nis. The pairing of Ni and Co in spinel‐structure together with RC produced catalyst was oxygen‐deficient highly active for total oxidation of the mixture at the lowest temperature of 350°C. The NiCoRC was found stable under reaction‐conditions for 50h at 350°C and after four successive heating (350°C)‐cooling (35°C) cycles besides accelerated‐aging tests up to 600°C. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2632–2646, 2018

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“…(38-0849). The structure was tetragonal-body centered CuO(Mn)Ce phase, and crystallite size of the catalyst was 2.30 nm [25]. In the CuMnOx catalyst doped with (1.5 % CeOx) and (1 % AgOx) prepared in stagnant air calcination conditions and their Figure 4, we get the result that the crystalline phase of doped and undoped CuMnOx catalyst is existed [15].…”

Section: Phase Identification and Cell Dimensionsmentioning

confidence: 90%

Effects of Doping on the Performance of CuMnOx Catalyst for CO Oxidation

Dey

Dhal

Прасад

et al. 2017

Bull. Chem. React. Eng. Catal.

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The rare earth-doped CuMnOx catalysts were prepared by co-precipitation method. The CuMnOx catalyst was doped with (1.5 wt.%) CeOx, (1.0 wt.%) AgOx, and (0.5 wt.%) of AuOx by the dry deposition method. After the precipitation, filtration, and washing process, drying the sample at 110 o C for 16 hr in an oven and calcined at 300 o C temperature for 2 h in the furnace at stagnant air calcination condition. The influence of doping on the structural properties of the catalyst has enhanced the activity of the catalyst for CO oxidation. The doping of noble metals was not affected the crystal structure of the CuMnOx catalyst but changed the planar spacing, adsorption performance, and reaction performance. The catalysts were characterized by Brunauer-Emmett-Teller (BET) surface are, Scanning Electron Microscope Energy Dispersive X-ray (SEM-EDX), X-Ray Diffraction (XRD), and Fourier Transform Infra Red (FTIR) techniques. The results showed that doping metal oxides (AgOx, AuOx, and CeOx) into CuMnOx catalyst can enhance the CO adsorption ability of the catalyst which was confirmed by different types of characterization technique.

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Reactive calcination route for synthesis of active Mn–Co 3 O 4 spinel catalysts for abatement of CO–CH 4 emissions from CNG vehicles

Cited by 40 publications

References 76 publications

Simultaneous Control of NOx-Soot by Substitutions of Ag and K on Perovskite (LaMnO3) Catalyst

Simultaneous Control of NOx-Soot by Substitutions of Ag and K on Perovskite (LaMnO3) Catalyst

Design of active NiCo₂O_4‐δ spinel catalyst for abatement of CO‐CH₄ emissions from CNG fueled vehicles

Effects of Doping on the Performance of CuMnOx Catalyst for CO Oxidation

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Reactive calcination route for synthesis of active Mn–Co 3 O 4 spinel catalysts for abatement of CO–CH 4 emissions from CNG vehicles

Cited by 40 publications

References 76 publications

Simultaneous Control of NOx-Soot by Substitutions of Ag and K on Perovskite (LaMnO3) Catalyst

Simultaneous Control of NOx-Soot by Substitutions of Ag and K on Perovskite (LaMnO3) Catalyst

Design of active NiCo2O4‐δ spinel catalyst for abatement of CO‐CH4 emissions from CNG fueled vehicles

Effects of Doping on the Performance of CuMnOx Catalyst for CO Oxidation

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Design of active NiCo₂O_4‐δ spinel catalyst for abatement of CO‐CH₄ emissions from CNG fueled vehicles