Spectroscopic characterization of Co3O4 catalyst doped with CeO2 and PdO for methane catalytic combustion

Jodłowski, Przemysław J.; Jędrzejczyk, Roman J.; Rogulska, Anna; Wach, Anna; Kuśtrowski, Piotr; Sitarz, Maciej; Łojewski, Tomasz; Kołodziej, Andrzej; Łojewska, Joanna

doi:10.1016/j.saa.2014.05.027

Cited by 40 publications

(18 citation statements)

References 18 publications

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“…3, which represents the spectra of the Co 3 O 4 samples registered with an excitation wavelength of 514 nm, the asymmetry of the peaks, especially A 1g , is observed for SCS prepared samples. It can be attributed to the presence of reduced forms of cobalt oxide CoO x [33,46]. This phenomenon is not visible for the samples obtained via precipitation method, showing the influence of transient conditions of the synthesis during combustion on the oxidation state of cobalt.…”

Section: Resultsmentioning

confidence: 89%

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The Effect of the Preparation Method of Pd-Doped Cobalt Spinel on the Catalytic Activity in Methane Oxidation Under Lean Fuel Conditions

et al. 2016

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In this work a series of cobalt spinel catalysts was synthesized by different methods and doped with 1 wt% of palladium via incipient wetness impregnation or solution combustion synthesis (SCS). Both undoped and Pd-doped spinels were characterized from the structural and surface point of view (XRD, XRF, lRS, BET, FESEM) and tested toward the oxidation of methane in lean conditions, in gas mixtures containing from 0.5 to 2 vol% of CH 4 . These methane concentrations are typical of processes involving combustion of CH 4 in lean conditions as the after-treatment of unconverted CH 4 in compressed natural gas-fed vehicle exhausts, or the treatment of fugitive CH 4 from leaks in coal mines. The temperature window for the catalytic activity of the undoped Co 3 O 4 materials spread from 350 to 600°C. The preparation method affected the catalytic activity of undoped Co 3 O 4 , with the best catalytic activity related to the spinel prepared by SCS employing urea. The addition of 1 wt% of Pd lowered the temperature window for the catalytic activity to the range of 250-500°C, with insignificant differences for the various preparation methods. The beneficial effect of Pd-doping was assigned to the enhancement of the reduction of cobalt in the oxide structure.

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Section: Resultsmentioning

confidence: 89%

“…Specifically, undoped and doped Co 3 O 4 displays excellent performance towards the catalytic combustion of CH 4 [31][32][33][34][35]. Recent studies demonstrated that when a high number of structural defects and a great amount of nonstoichiometric oxygen are available the catalytic activity is improved [34,36,37].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Preparation Method of Pd-Doped Cobalt Spinel on the Catalytic Activity in Methane Oxidation Under Lean Fuel Conditions

et al. 2016

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“…22 Several Raman bands related to cobalt oxides were identified using Raman spectroscopy shown in Figure 4 (c), which could not be directly detected from XRD measurement in the 10%Co-CeO 2 sample. They can be assigned to the cobalt oxides according to the literature, 23 suggesting the existence of small well dispersed CoO x on CeO 2 . Similarly, the bands at 229, 547, and 629 were assigned to the NiO species for the 10%Ni-CeO 2 sample in Figure 4 (d).…”

Section: Structural Description Of Ceo 2 Nanorods-supported Tm Catalystsmentioning

confidence: 90%

CeO2 nanorods-supported transition metal catalysts for CO oxidation

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et al. 2016

Journal of Colloid and Interface Science

117

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A catalytically active oxide support in combination with metal catalysts is required in order to achieve better low temperature activity and selectivity. Here, we report that CeO2 nanorods with a superior surface oxygen release/storage capability were used as an active support of transition metal (TM) catalysts (Mn, Fe, Co, Ni, Cu) for CO oxidation reaction. The as-prepared CeO2 nanorods supported 10 wt% TM catalysts were highly active for CO oxidation at low temperature, except for the Fe sample. It is found that the 10%Cu-CeO2 catalyst performed best, and it provided a lower light-off temperature with T50 (50% conversion) at 75 °C and T100 (100% conversion) of CO to CO2 at 194 °C. The atomic level surface structure of CeO2 nanorods was investigated in order to understand the improved low temperature catalytic activity. The richness of surface roughness and various defects (voids, lattice distortion, bending, steps, twinning) on CeO2 nanorods could facilitate oxygen release and storage. According to XRD and Raman analysis, copper species migrate into the bulk CeO2 nanorods to a greater degree. Since CO adsorbed over the surface of the catalyst/support is detrimental to its catalytic activity, the surface defects on the CeO2 nanorods and CeO2-TM interactions were critical to the enhanced activity.

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“…The literature provides several examples that can be used as alternatives to noble metal. The catalysts containing single transition metal oxides such as chromium [ 26 ], manganese [ 27 ], cobalt [ 28 , 29 , 30 ], and copper [ 31 ], as well as composite catalysts such as cobalt-palladium [ 32 ] or cobalt-chromium [ 26 ] have demonstrated superior activity in methane or VOC combustion. However, in most cited references, the catalysts are prepared either via an impregnation or a precipitation/co-precipitation method.…”

Section: Introductionmentioning

confidence: 99%

Non-Noble Metal Oxide Catalysts for Methane Catalytic Combustion: Sonochemical Synthesis and Characterisation

et al. 2017

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The aim of this study was to obtain nanocrystalline mixed metal-oxide–ZrO2 catalysts via a sonochemically-induced preparation method. The effect of a stabiliser’s addition on the catalyst parameters was investigated by several characterisation methods including X-ray Diffraction (XRD), nitrogen adsorption, X-ray fluorescence (XRF), scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectrometer (EDS), transmission electron microscopy (TEM) and µRaman. The sonochemical preparation method allowed us to manufacture the catalysts with uniformly dispersed metal-oxide nanoparticles at the support surface. The catalytic activity was tested in a methane combustion reaction. The activity of the catalysts prepared by the sonochemical method was higher than that of the reference catalysts prepared by the incipient wetness method without ultrasonic irradiation. The cobalt and chromium mixed zirconia catalysts revealed their high activities, which are comparable with those presented in the literature.

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Spectroscopic characterization of Co3O4 catalyst doped with CeO2 and PdO for methane catalytic combustion

Cited by 40 publications

References 18 publications

The Effect of the Preparation Method of Pd-Doped Cobalt Spinel on the Catalytic Activity in Methane Oxidation Under Lean Fuel Conditions

The Effect of the Preparation Method of Pd-Doped Cobalt Spinel on the Catalytic Activity in Methane Oxidation Under Lean Fuel Conditions

CeO2 nanorods-supported transition metal catalysts for CO oxidation

Non-Noble Metal Oxide Catalysts for Methane Catalytic Combustion: Sonochemical Synthesis and Characterisation

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