Morphology-dependent properties of CeO2 nano-catalysts on CH2Cl2 oxidation

Zhang, Xinhua; Pei, Zhiying; Lu, Hanfeng; Huang, Haifeng

doi:10.1039/c6ra14699f

Cited by 7 publications

(11 citation statements)

References 35 publications

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“…Zhang et al synthesized morphology-dependent CeO 2 with nanorods, nanocubes, and nanopolyhedra shapes. The CeO 2 rod showed optimum conversion efficiency for long-term testing in CH 2 Cl 2 decomposition . The author explained it by the abundant surface-adsorbed oxygen species and oxygen vacancies that existed on {1 1 0} and {1 1 1} planes of the CeO 2 rod.…”

Section: Introductionmentioning

confidence: 98%

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Zhao

Dong

Han

et al. 2019

Ind. Eng. Chem. Res.

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Catalytic reactions usually proceed on a catalyst surface, and surface properties could be fine-tuned by the catalyst shape and exposed crystal-plane. In the present work, morphology-dependent CeMnO x nanostructures (rods, octahedrons, and cubes) were synthesized via the hydrothermal method, and they exposed special crystal-planes of {111}/{100}/{110}, {111}, and {100} for CeMnO x rods, octahedrons, and cubes, respectively. The best catalytic activity for the catalytic combustion reaction of 1,2dichlorobenzene (o-DCB) whether in dry or wet conditions was observed over CeMnO x rods followed by CeMnO x octahedrons and cubes. The optimum catalytic performance of CeMnO x rods could be associated to its high reducibility and large amounts of oxygen vacancies. An interesting phenomenon was observed on kinetic results that the variation of active energy, reaction rate, and TOF were inconsistent with T 90 , and they could be explained by weak and medium strong acidity, indicating the shape effects of CeMnO x nanostructures.

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Section: Introductionmentioning

confidence: 98%

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Zhao

Dong

Han

et al. 2019

Ind. Eng. Chem. Res.

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“…By varying the hydrothermal and calcined temperature, Zhang et al corroborate the significant morphology-dependent effects on catalytic CH 2 Cl 2 oxidation with four CeO 2 morphologies (nanorods, nanocubes, nanopolyhedra, and bulk nanoparticles). They attribute the best activity of nanorods to the abundant surface defects, the increased amount of adsorbed active oxygen species, and good reducibility . As a similar case of the hydrothermal method and the promotional mechanism, CeO 2 nanorods reported by Tinoco et al.…”

Section: Introductionmentioning

confidence: 75%

“…Therefore, various strategies have been implemented in recent years to further enhance the photocatalytic CO 2 reduction efficiency of CeO 2 , such as defect or vacancy engineering, − element doping, , and heterojunction construction. − In comparison with the extensive exploration of these strategies, there are rare reports to date concerning the crystal phase engineering strategy (CPES) to synthesize specific morphology dependence of CeO 2 for this reaction, which is commonly recognized to be effective to tune the photocatalytic performance of the corresponding pristine semiconductors by altering the light absorption range, steering charge transfer and separation, and maneuvering surface reactions for desired results . Actually, CPES has been widely investigated on the synthesis of different types of CeO 2 nanocrystallines for various catalytic reactions over the past years. − For instance, Shi et al report the synthesis of mesoporous microcuboid CeO 2 crystals by a hydrothermal-calcination method with a significant enhancement in catalytic activity on benzene oxidation as compared to single-crystal CeO 2 nanocubes without mesopores . With a formaldehyde-assisted hydrothermal system, Rao et al synthesized CeO 2 nanobelts, which show a higher SSA, larger lattice cell expansion, and sequentially better catalytic performance for CO oxidation than the nanorod and nanowire counterparts .…”

Section: Introductionmentioning

confidence: 99%

Biomass-Assisted Synthesis of CeO₂ Nanorods for CO₂ Photoreduction under Visible Light

Liu

Zheng

Duan

et al. 2021

ACS Appl. Nano Mater.

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CO2 photoreduction into high-valued fuels is considered as a promising route to alleviate the clash between the environment and energy. Morphology-dependent CeO2 nanocrystallines with special crystal planes and increased amounts of specific surface areas, structural defects, and active sites have recently demonstrated excellent performance in catalysis. In this article, a biomass-assisted synthesis of CeO2 (BC) photocatalyst is successfully synthesized via a simple yet effective hydrothermal-calcining method by using commercial Ce(NO3)3 as a precursor and leaves of Alternanthera philoxeroides (LAP) as a crystal growth modifier. The amount of LAP introduced into the precursor has a significant effect on regulating the growth of the formed CeO2 from nanocubes to nanorods for the resulting BCs. Owing to the emergence of the just right microenvironment for regulating the growth of the CeO2 nanocrystalline, the optimal sample of BC-15 with a morphology of nanorods is found to be the most efficient one as a photocatalyst for CO2 reduction under visible light. As the major product, the CO yield (126.8 μmol g–1 at a reaction time of 6 h) of BC-15 is ∼7.4-fold of the reference CeO2 nanocubes synthesized without LAP in the precursor. In addition, the underlying evolution process of the nanorods and detailed mechanism insight into the boosted CO2 photoreduction performance are investigated by means of a series of experimental characterizations and results. The present work provides a meaningful protocol to utilize the crystal phase engineering strategy to design morphology dependence of photocatalysts and assisted synthesis with renewable biomass materials for solar-to-fuel conversion.

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“…The optimal catalyst was obtained by the sol‐gel method with the atomic ratio of Mn/Ti of 1 : 4, which showed the complete CB conversion at 300 °C (100 ppm, Air, GHSV=36000 h −1 ). In the research of Zhang and his colleagues, [15] four types of CeO 2 catalysts with different morphologies (nanorods, nanopolyhedra, nanocubes, and nanoparticles) were synthesized by different methods and applied in dichloromethane combustion. Among all the samples, CeO 2 nanorods has the best activity.…”

Section: Introductionmentioning

confidence: 99%

“…°C (100 ppm, Air, GHSV = 36000 h À 1 ). In the research of Zhang and his colleagues, [15] four types of CeO 2 catalysts with different [a] Y.…”

mentioning

confidence: 99%

A Facile Method to Synthesize Co₃O₄ Catalyst for Efficient Chlorobenzene Combustion

Chen

et al. 2022

ChemistrySelect

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Preparation methods are essential for the synthesis of materials with diverse structures, which may lead to the different physicochemical properties. The activities of catalysts for volatile organic compounds (VOCs) combustion can be improved by optimizing the preparation methods. In this paper, a novel ammonium bicarbonate pyrolysis method is successfully applied to prepare Co3O4 catalyst (Co3O4‐A), which is not only facile in preparation, but also superior to the Co3O4 catalysts prepared by the hydrothermal, sol‐gel, MOFs pyrolysis and carbonate pyrolysis method in the performance of chlorobenzene catalytic oxidation with 90 % conversion and mineralization temperature at 310 and 325 °C, respectively (1000 ppm CB, Air, WHSV=60,000 mL ⋅ g−1 ⋅ h−1). Furthermore, Co3O4‐A catalyst can maintain high catalytic activity for a long time, and has high tolerance to water vapor, which indicates Co3O4‐A catalyst has a good potential application value in catalytic combustion of chlorobenzene.

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Morphology-dependent properties of CeO₂ nano-catalysts on CH₂Cl₂ oxidation

Abstract: Morphology-dependent properties of CeO2 nano-catalysts on CH2Cl2 oxidation: a diagrammatic drawing of dichloromethane oxidation over CeO2 nanorods.

Cited by 7 publications

References 35 publications

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Biomass-Assisted Synthesis of CeO₂ Nanorods for CO₂ Photoreduction under Visible Light

A Facile Method to Synthesize Co₃O₄ Catalyst for Efficient Chlorobenzene Combustion

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Morphology-dependent properties of CeO2 nano-catalysts on CH2Cl2 oxidation

Abstract: Morphology-dependent properties of CeO2 nano-catalysts on CH2Cl2 oxidation: a diagrammatic drawing of dichloromethane oxidation over CeO2 nanorods.

Cited by 7 publications

References 35 publications

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnOx Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnOx Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Biomass-Assisted Synthesis of CeO2 Nanorods for CO2 Photoreduction under Visible Light

A Facile Method to Synthesize Co3O4 Catalyst for Efficient Chlorobenzene Combustion

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Morphology-dependent properties of CeO₂ nano-catalysts on CH₂Cl₂ oxidation

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Biomass-Assisted Synthesis of CeO₂ Nanorods for CO₂ Photoreduction under Visible Light

A Facile Method to Synthesize Co₃O₄ Catalyst for Efficient Chlorobenzene Combustion