CeO2 immobilized on magnetic core-shell microparticles for one-pot synthesis of imines from benzyl alcohols and anilines: Support effects for activity and stability

Long, Yu; Gao, Zekun; Qin, Jiaheng; Wang, Peng; Wu, Wei; Zhang, Lin; Dong, Zhengping; Ma, Jiantai

doi:10.1016/j.jcis.2018.11.092

Cited by 23 publications

(8 citation statements)

References 43 publications

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“…The intrinsic properties (e.g., surface oxygen vacancy concentration, Brønsted acid sites, the ratio of Ce 3+ /Ce 4+ ) and morphology (e.g., porous structure) all have significant effects on the oxidation of benzyl alcohol to benzaldehyde, which is the rate-determining step in the direct coupling of alcohol and amine to the corresponding imines. − CeO 2 nanomaterials (e.g., nanoflakes, mesoporous hollow nanostructures, mesoporous structures) have been investigated for optimizing their catalytic performances via tuning the surface oxygen vacancies, Ce 3+ /Ce 4+ ratio and the surface peroxy anion O 2 – ratio. , Besides the intrinsic properties of CeO 2 , the catalytic performance of CeO 2 in the oxidative coupling of alcohols and amines to imines can also be improved by its support, such as the improved dispersion for CeO 2 nanocrystals and the possible reaction between carboxylic and ester sites of the mesoporous carbon support and rich hydroxyl groups of CeO 2 , the promoted oxidation of alcohols to benzaldehyde due to the improved alkalinity at low reaction temperature, and the stabilized Ce 3+ /Ce 4+ pair of CeO 2 due to the generated Lewis basic site by the doped nitrogen in Fe 3 O 4 @CN@CeO 2 …”

Section: Ceria-based Catalysts For Selective Oxidation Via Thermocata...mentioning

confidence: 99%

“…63,64 Besides the intrinsic properties of CeO 2 , the catalytic performance of CeO 2 in the oxidative coupling of alcohols and amines to imines can also be improved by its support, 65 such as the improved dispersion for CeO 2 nanocrystals and the possible reaction between carboxylic and ester sites of the mesoporous carbon support and rich hydroxyl groups of CeO 2 , 66 the promoted oxidation of alcohols to benzaldehyde due to the improved alkalinity at low reaction temperature, and the stabilized Ce 3+ /Ce 4+ pair of CeO 2 due to the generated Lewis basic site by the doped nitrogen in Fe 3 O 4 @CN@CeO 2 . 67 Besides the oxidation of alcohols and amine to the imine, CeO 2 is also a versatile, reusable, and optimal catalyst for the conversion of alcohols by the addition of esters, 68 ketones, 69 nitriles, 70 amide, 71 and several molecules together. 72,73 In the oxidative C−C coupling of ketone and primary alcohol to synthesize α,β-unsaturated ketones, Zhang et al showed a 74% conversion of acetophenone with 89% selectivity to chalcone over CeO 2 in 12 h at 150 °C in the absence of alkali additives.…”

Section: Ceria-based Catalysts For Selectivementioning

confidence: 99%

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Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

et al. 2021

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Value-added chemicals, fuels, and pharmaceuticals synthesized by organic transformation from raw materials via catalytic techniques have attracted enormous attention in the past few decades. Heterogeneous catalysts with high stability, long cycling life, good environmental-friendliness, and economic efficiency are greatly desired to accomplish the catalytic organic transformations. With the advantages of reversible Ce3+/Ce4+ redox pairs, tailorable oxygen vacancies, and surface acid–base properties, ceria-based catalysts have been actively investigated in the fields of catalytic organic synthesis. In this Review, we summarize the fundamentals and latest applications of ceria-based heterogeneous catalysts for organic transformations via thermocatalytic and photocatalytic routes. The fabricating approaches of various ceria and ceria-based catalysts and their structure/composition–activity relationship are discussed and prospected. The advanced characterization techniques and theoretical methods for reaction mechanism studies over CeO2-based catalysts are summarized and discussed. This comprehensive Review provides a basic understanding of the structure–performance relationships of ceria-based catalysts for organic synthesis. In addition, it also provides some insights and outlooks in the design and research direction in the ceria-based catalysts with better performance.

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Section: Ceria-based Catalysts For Selective Oxidation Via Thermocata...mentioning

confidence: 99%

Section: Ceria-based Catalysts For Selectivementioning

confidence: 99%

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

et al. 2021

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“…Besides, the obvious FTIR peak around 650 cm −1 of NR@BiOI corresponds to the CeO bond, which has been reported in previous articles. [ 28 ] The obvious CeO bond peaks of CeO 2 NR/BiOI may be related to the morphology of NR and the combination of NR and BiOI.…”

Section: Resultsmentioning

confidence: 99%

Shape‐Dependent CeO₂@BiOI for Degradation of Aqueous Cr(VI)

Peng

Yang

Guo

et al. 2020

Adv Materials Inter

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CeO2 with different morphologies (nanoparticles/NP, nanorods/NR, nanocubes/NC, nano‐octahedra/NO) are synthesized and decorated on BiOI nanoplates substrates to form CeO2@BiOI composites, which are used for aqueous Cr(VI) degradation. The intersurface states between BiOI and diverse CeO2 nanoparticles exhibit distinct behaviors when checked by XPS and photoluminescence intensity. The Cr(VI) degradation results show that the synthesized CeO2@BiOI nanocomposites possess higher photocatalytic activity than pure CeO2 or BiOI, and the CeO2‐NP@BiOI nanocomposite (molar ratio of CeO2: BiOI = 1:2) is the best one among them, with which the Cr(VI) is degraded up to 95.0% after 30 min irradiation using it as the photocatalyst. The superior catalytic performance of CeO2‐NP@BiOI can be attributed to a higher Ce3+ ratio of CeO2‐NP, a larger specific surface area, relatively low OH/CO32− content on the composite surface, and especially the good interaction between the CeO2 (111) facet and the BiOI surface.

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“…CeO 2 is a new promising catalyst for imine synthesis, which can overcome the problems caused by traditional acid/base catalysts ( Tamura and Tomishige, 2015 ) and bring a lot of advantages, such as mild synthesis conditions and fast separation. Many research studies have focused on CeO 2 application in imine synthesis ( Geng et al, 2016 ; Long et al, 2019a ; Long et al, 2019b ; Cao et al, 2020 ; Rizzuti et al, 2020 ; Tamura and Tomishige, 2020 ), and it has been reported that CeO 2 morphologies can greatly influence the catalytic activity for imine synthesis ( Zhang et al, 2017 ; Yang et al, 2018 ; Zhang et al, 2018 ; Yang et al, 2020a ; Yang et al, 2020b ), which have a close relationship with the CeO 2 specific surface area and Ce 3+ defects.…”

Section: Introductionmentioning

confidence: 99%

CeO2 Structure Adjustment by H2O via the Microwave–Ultrasonic Method and Its Application in Imine Catalysis

2022

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CeO2 with fusiform structures were prepared by the combined microwave–ultrasonic method, and their morphologies and surface structure were changed by simply adding different amounts of H2O (1–5 ml) to the precursor system. The addition of H2O changed the PVP micelle structure and the surface state, resulting in CeO2 with a different specific surface area (64–111 m2 g−1) and Ce3+ defects (16.5%–28.1%). The sample with 2 ml H2O exhibited a high surface area (111.3 m2∙g−1) and relatively more surface defects (Ce3+%: 28.1%), resulting in excellent catalytic activity (4.34 mmol g−1 h−1).

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CeO2 immobilized on magnetic core-shell microparticles for one-pot synthesis of imines from benzyl alcohols and anilines: Support effects for activity and stability

Cited by 23 publications

References 43 publications

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

Shape‐Dependent CeO₂@BiOI for Degradation of Aqueous Cr(VI)

CeO2 Structure Adjustment by H2O via the Microwave–Ultrasonic Method and Its Application in Imine Catalysis

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CeO2 immobilized on magnetic core-shell microparticles for one-pot synthesis of imines from benzyl alcohols and anilines: Support effects for activity and stability

Cited by 23 publications

References 43 publications

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

Shape‐Dependent CeO2@BiOI for Degradation of Aqueous Cr(VI)

CeO2 Structure Adjustment by H2O via the Microwave–Ultrasonic Method and Its Application in Imine Catalysis

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Shape‐Dependent CeO₂@BiOI for Degradation of Aqueous Cr(VI)