Good interaction between well dispersed Pt and LaCoO3 nanorods achieved rapid Co3+/Co2+ redox cycle for total propane oxidation

Luo, Yong; Zuo, Juan; Feng, Xiaohui; Qian, Qingrong; Zheng, Yingbin; Dong, Lin; Huang, Baoquan; Chen, Qinghua

doi:10.1016/j.cej.2018.09.158

Cited by 64 publications

(38 citation statements)

References 49 publications

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“…Interestingly, the lowest temperature of the narrow peak is found on the CoCeOx-70 sample, which indicates that its oxygen species are highly active to react with propane. In general, all the positive peaks of CO2 are ascribed to the lattice oxygen species consumption, which is consistent with the Mars-van Krevelen mechanism that lattice oxygen species play an important role in catalytic oxidation of propane [29].…”

Section: Characterizations Of Co3o4-ceo2 Binary Oxidessupporting

confidence: 85%

Insight into catalytic properties of Co3O4-CeO2 binary oxides for propane total oxidation

Zhu

Chen

Jin

et al. 2020

Chinese Journal of Catalysis

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A series of Co3O4-CeO2 binary oxides with various Co/(Ce+Co) molar ratios were synthesized using a citric acid method, and their catalytic properties toward the total oxidation of propane were examined. The activities of the catalysts decrease in the order CoCeOx-70 > CoCeOx-90 > Co3O4 > CoCe-Ox-50 > CoCeOx-20 > CeO2. CoCeOx-70 (Co/(Ce+Co) = 70% molar ratio) exhibits the highest catalytic activity toward the total oxidation of propane, of which the T90 is 310 °C (GHSV = 120000 mL h  1 g  1), which is 25 °C lower than that of pure Co3O4. The enhancement of the catalytic performance of CoCeOx-70 is attributed to the strong interaction between CeO2 and Co3O4, the improvement of the low-temperature reducibility, and the increase in the number of active oxygen species. In-situ DRIFTS and reaction kinetics measurement reveal that Ce addition does not change the reaction mechanism, but promotes the adsorption and activation of propane on the catalyst surface. The addition of water vapor and CO2 in reactant gas has a negative effect on the propane conversion, and the catalyst is more sensitive to water vapor than to CO2. In addition, CoCeOx-70 exhibits excellent stability and reusability in water vapor and CO2 atmosphere.

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Section: Characterizations Of Co3o4-ceo2 Binary Oxidessupporting

confidence: 85%

Insight into catalytic properties of Co3O4-CeO2 binary oxides for propane total oxidation

Zhu

Chen

Jin

et al. 2020

Chinese Journal of Catalysis

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“…The Co 2p3/2 spectra (Fig. 5(a)) could be resolved to three components at binding energies (BEs) of 780.3, 782.0, and 788.1 eV, assigned to Co 2+ , Co 3+ , and the satellite peak of Co 2+ , respectively [41]. These components gradually shift toward high BEs with increasing Cr content in the catalyst (up to 0.5 eV), suggesting the charge transfer from Co to Cr species.…”

Section: General Characterizations Of the Catalystsmentioning

confidence: 99%

Co–Cr–O mixed oxides for low–temperature total oxidation of propane: Structural effects, kinetics, and spectroscopic investigation

Liao¹,

Zhao²,

Cen³

et al. 2020

Chinese Journal of Catalysis

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“…Moreover, low volatility and low toxicity of manganese oxide make it promising as a viable noble-metal free catalytic system. In order to reduce the performance gap between noble metals and transition metal oxides, the research of strategies allowing the enhancement of metal support interactions [16] and/or the improvement of textural properties (surface area, pore shape/size/orientation) is needed. In most of the studies, enhanced textural properties usually request soft/ hard templating technologies involving more delicate protocols which are usually assigned to the template infiltration and removal processes [17].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical porous ε-MnO2 from perovskite precursor: Application to the formaldehyde total oxidation

Dhainaut

Rochard

et al. 2020

Chemical Engineering Journal

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A simple template-free method, based on a mineral acid etching process using manganite perovskite (LaMnO 3) as precursor, was successfully developed to obtain a series of 3D meso/macro-porous materials. The LaMnO 3 transformation was fully investigated using ICP, XRD, N 2 physisorption, TPR, TPD, SEM, TEM/EDS and XPS. This transformation proceeds through a soft-chemical process involving the dissolution of trivalent lanthanum and manganese from the perovskite structure and the dismutation of Mn 3+ cations into MnO 2 and Mn 2+ species. Strength and oxidizing properties of the acid used as modifying agent strongly impact textural and redox surface properties of the resulting materials. Specifically, extending the acid etching duration promotes the surface area and pore volume of the materials while developing interconnected macro-mesoporous networks. In our case, this soft process allowed us to obtain the ε-MnO 2 phase with hierarchical porosity without any template. Superior catalytic properties of ε-MnO 2 were observed toward HCHO oxidation as well as a good catalytic stability with respect to other macro-mesoporous counterparts. In the light of the experimental results, such performances can be related to the formation of a meso/macro-porous structure conferring high surface area and good accessibility of the active surface sites. The latter exhibit greater redox ability of the manganese species and a higher density of active surface oxygen species with respect to the perovskite precursor.

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Good interaction between well dispersed Pt and LaCoO3 nanorods achieved rapid Co3+/Co2+ redox cycle for total propane oxidation

Cited by 64 publications

References 49 publications

Insight into catalytic properties of Co3O4-CeO2 binary oxides for propane total oxidation

Insight into catalytic properties of Co3O4-CeO2 binary oxides for propane total oxidation

Co–Cr–O mixed oxides for low–temperature total oxidation of propane: Structural effects, kinetics, and spectroscopic investigation

Hierarchical porous ε-MnO2 from perovskite precursor: Application to the formaldehyde total oxidation

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