Zr-doped CeO2 nanorods as versatile catalyst in the epoxidation of styrene with tert-butyl hydroperoxide as the oxidant

Liu, Xin; Ding, Jing; Lin, Xi; Gao, Ruihua; Li, Zhenhua; Dai, Wei‐Lin

doi:10.1016/j.apcata.2015.07.010

Cited by 93 publications

(37 citation statements)

References 45 publications

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“…The peaks at binding energies of 529.5, 531.7, and 533.6 eV can be ascribed to lattice oxygen (O α ), oxygen vacancies (O β ), and other weakly bound and chemisorbed oxygen species (O γ ). The ratio of O β to O T (O T =O α +O β +O γ ) can be used to estimate the rough concentration of surface oxygen vacancies . Notably, for 20Cu/CeO 2 and 30Cu/CeO 2 , the γ peak nearly disappears, which shows that 20Cu/CeO 2 and 30Cu/CeO 2 have only a small amount of surface weakly bound oxygen species.…”

Section: Resultsmentioning

confidence: 99%

Insight into the Synergism between Copper Species and Surface Defects Influenced by Copper Content over Copper/Ceria Catalysts for the Hydrogenation of Carbonate

Cui

Liu

et al. 2018

ChemCatChem

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Various Cu/CeO2 nanorod catalysts with different copper contents were synthesized through a facile coprecipitation method for the hydrogenation of diethyl carbonate to methanol in a fixed‐bed reactor. The methanol yield increased upon increasing the copper loading, but large excess amounts of copper led to deactivation of the catalyst at a high liquid hourly space velocity because of aggregation of the active metal. The 20Cu/CeO2 and 30Cu/CeO2 catalysts displayed superior catalytic performance with methanol space‐time yields of 8.4 and 8.1 mmol gcat−1 h−1, respectively. The remarkably enhanced catalytic performance was mainly ascribed to a high Cu0 surface area, appropriate ratio of Cu+/Cu0, and more surface oxygen vacancies associated with Ce3+, which stemmed from a strong interaction between Cu and the CeO2 support.

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Section: Resultsmentioning

confidence: 99%

Insight into the Synergism between Copper Species and Surface Defects Influenced by Copper Content over Copper/Ceria Catalysts for the Hydrogenation of Carbonate

Cui

Liu

et al. 2018

ChemCatChem

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“…This is because the nanorods enclosing the {110} and {100} facets were obtained under a high concentration of NaOH (6 mol/L), as shown by Mai et al However, a higher base concentration is needed to obtain the longer nanorods of the Ce‐Zr solid solution because different base concentrations resulted in different anisotropic growth in the Ce(OH) 3 and Zr(OH) 4 , making it difficult to produce the long nanorod. Therefore, the Zr doped CeO 2 nanorod generally possessed a short length, as seen in the literature . In this work, the best concentration of NaOH is between 9‐12 mol/L and the length of Ce‐Zr nanorods is ~ 50‐150 nm.…”

Section: Resultsmentioning

confidence: 60%

Direct oxidation esterification of methacrolein with methanol: Oxygen vacancy promotion of Zr‐doped Au/CeO₂ nanorods

Tian

Zheng

et al. 2019

Can J Chem Eng

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A series of Zr-doped CeO 2 nanorods supported by Au nanoparticle catalysts with different morphologies were prepared for methyl methacrylate (MMA) synthesis via direct oxidation esterification of methacrolein (MAL) with methanol. Catalytic activities under mild conditions (0.3 MPa; 80 C) were evaluated in the kettle reactor. Different characterization methods, such as XRD, Raman, N 2 adsorption, ICP, TEM, SEM, XPS, and H 2 -TPR techniques, were applied to study the relationship between catalytic activity and structural characteristics, especially the form of Zr doped into the lattice of CeO 2 and the promotion mechanism of selective oxidation.The influence of Au supported on Ce 0.6 Zr 0.4 O 2 nanorods (Au/CZ-R) was also discussed. The results exhibited that the highest catalytic activity for the oxidative esterification with a MAL conversion of 99% and a MMA selectivity of 74% was achieved. The MMA synthesis performance correlated well with the surface oxygen vacancies, in particular for the active oxygen species around the Au particles. K E Y W O R D Sactive oxygen species, CeO 2 nanorods, MMA, oxidative esterification, selective oxidation

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“…Notably, the catalytic activity of Mn 3 O 4 MNAs was higher or even comparable to that of other commonly used metal oxide catalysts (Table S1). For example, the Mn 3 O 4 MNAs catalyst outperforms the catalytic activity of MoO 3, MoO 2, Fe 3 O 4, NiFe 2 O 4 and Mg 0.4 Fe 2.6 O 4 NPs, NiCoFe spinel‐type oxide nanosheets, NiO and CoO microparticles and mesoporous vanadium silicate‐1 zeolites, whereas it is nearly as effective as the Co 3 O 4 and CuO NPs and Zr‐doped CeO 2 nanorods studied under similar reaction conditions.…”

Section: Resultsmentioning

confidence: 95%

Mesoporous Assembled Mn₃O₄ Nanoparticle Networks as Efficient Catalysts for Selective Oxidation of Alkenes and Aryl Alkanes

et al. 2016

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The design of nanoscale materials has been considered important for enhancing their surface properties for catalysis. Metal oxide nanoparticles have a large number of exposed surface active sites, but they suffer from low reactivity and poor stability resulting from excessive aggregation into less active microscopic structures. Herein, the synthesis of mesoporous Mn3O4 nanoparticle assemblies by polymer‐assisted self‐assembly is presented and their catalytic activity is demonstrated in the oxidation of various saturated and unsaturated hydrocarbons, including aromatic alkenes and aryl alkanes, in the presence of tert‐butyl hydroperoxide as a mild oxidant. It is also shown through comparative studies that the high catalytic activity and stability of these Mn3O4 assemblies arise from the unique three‐dimensional open‐pore structure, high internal surface area (90 m2 g−1) and uniform mesopores (≈6.6 nm in size).

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Zr-doped CeO2 nanorods as versatile catalyst in the epoxidation of styrene with tert-butyl hydroperoxide as the oxidant

Cited by 93 publications

References 45 publications

Insight into the Synergism between Copper Species and Surface Defects Influenced by Copper Content over Copper/Ceria Catalysts for the Hydrogenation of Carbonate

Insight into the Synergism between Copper Species and Surface Defects Influenced by Copper Content over Copper/Ceria Catalysts for the Hydrogenation of Carbonate

Direct oxidation esterification of methacrolein with methanol: Oxygen vacancy promotion of Zr‐doped Au/CeO₂ nanorods

Mesoporous Assembled Mn₃O₄ Nanoparticle Networks as Efficient Catalysts for Selective Oxidation of Alkenes and Aryl Alkanes

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Zr-doped CeO2 nanorods as versatile catalyst in the epoxidation of styrene with tert-butyl hydroperoxide as the oxidant

Cited by 93 publications

References 45 publications

Insight into the Synergism between Copper Species and Surface Defects Influenced by Copper Content over Copper/Ceria Catalysts for the Hydrogenation of Carbonate

Insight into the Synergism between Copper Species and Surface Defects Influenced by Copper Content over Copper/Ceria Catalysts for the Hydrogenation of Carbonate

Direct oxidation esterification of methacrolein with methanol: Oxygen vacancy promotion of Zr‐doped Au/CeO2 nanorods

Mesoporous Assembled Mn3O4 Nanoparticle Networks as Efficient Catalysts for Selective Oxidation of Alkenes and Aryl Alkanes

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Direct oxidation esterification of methacrolein with methanol: Oxygen vacancy promotion of Zr‐doped Au/CeO₂ nanorods

Mesoporous Assembled Mn₃O₄ Nanoparticle Networks as Efficient Catalysts for Selective Oxidation of Alkenes and Aryl Alkanes