Porous core–shell Fe3O4@CuSiO3 microsphere as effective catalyst for styrene epoxidation

Wu, Lingmin; Wang, Xiujun; Li, Baitao

doi:10.1016/j.apsusc.2022.153158

Cited by 13 publications

(2 citation statements)

References 70 publications

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“…The research on the magnetic catalyst of heavy oil is still in its infancy, considering excellent magnetic hydrogenation upgrading catalysts with a certain magnetic property and good viscosity reduction performance. On the one hand, the magnetic catalyst used to reduce viscosity is mainly concentrated in the traditional magnetic core Fe 3 O 4 with saturation magnetization of about 70 emu g −1 , 27 while the zero‐valent iron has a high saturation magnetization of >100 emu g −1 28 . On the other hand, homogeneously dispersed and supported bifunctional catalysts have high viscosity reduction performance, but there are few reports on the viscosity reduction of heavy oil hydrocracking using magnetic catalysts.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Fe‐based magnetic‐core‐supported Co and Ni catalyst: application in viscosity reduction of heavy oil hydrocracking

Yan

Zhu

Wang

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUNDHeavy oil has the characteristics of high viscosity and low American Petroleum Institute gravity, which makes it difficult to transport and produce. The key to efficiently utilizing heavy oil is reducing viscosity and improving quality. Hydroconversion has the advantages of viscosity reduction and decreased coke production, but it is difficult to separate nonmagnetic catalysts from the reaction system, which affects the industrial application.RESULTSA spherical Fe3O4 (74.71 emu g−1) and a chain FeFe2O3 (110 emu g−1) were prepared as magnetic cores, and coated with SiO2 and Al2O3 layers, respectively. The metal‐supported catalyst modified with Co and Ni show irregular and honeycomb‐shaped surfaces, and the magnetic saturation strength decreases to 24.91 and 14.63 emu g−1, but still possessing superparamagnetic properties, enabling the catalysts to be separated from the reaction mixture. Fe‐Fe2O3@SiO2@Al2O3@CoNi catalyst has the best viscosity reduction effect for Canadian oil sands asphalt residue at about 410 °C and 10 MPa hydrogen pressure. The viscosity of the liquid product decreased significantly from 56 600 to 135 mPa s at 50 °C, with a viscosity reduction of 99.8%.CONCLUSIONMagnetic catalyst prepared from chain‐like Fe‐Fe2O3 has an excellent honeycomb structure, which can provide increased active surfaces and exhibit improved viscosity reduction performance. This work provides a strategy for the recovery of heavy oil hydrogenation catalysts and is expected to play a key role in the practical application of heavy oil hydrogenation catalytic viscosity reduction. © 2023 Society of Chemical Industry.

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Section: Introductionmentioning

confidence: 99%

Preparation of Fe‐based magnetic‐core‐supported Co and Ni catalyst: application in viscosity reduction of heavy oil hydrocracking

Yan

Zhu

Wang

et al. 2023

J of Chemical Tech & Biotech

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“…The sample was employed to catalyze styrene epoxidation reaction as the first example, and the solvents, the amount of catalyst, the reaction temperature effects, the molar ratio of styrene/TBHP and the reaction time on the reaction products were further explored, thereby showing its excellent catalytic performance and stability in the catalytic styrene epoxidation. [25][26][27]…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Heterogeneous Sheet‐like Mesoporous Cu₃(PO₄)₂⋅3H₂O Catalysts and Selective Catalytic Oxidation of Styrene

et al. 2022

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In this work, without template and additives, sheet-like mesoporous Cu 3 (PO 4 ) 2 ⋅ 3H 2 O was successfully used to create by a simple solvothermal method. XRD, FT-IR, BET and SEM methods were used to characterize the structure and properties of the samples that were produced. The results revealed that the stacked mesoporous structure of the target sheet-like product was well-formed, and the pore diameter was centered at 3.17 nm. In addition, the sheet-like mesoporous Cu 3 (PO 4 ) 2 ⋅ 3H 2 O shows excellent ability to improve the yield of styrene oxide by the research of solvents, catalyst dosage, molar ratio of styrene/TBHP, the reaction temperature and the reaction time in the reaction system. Thus, when the solvent was acetonitrile, the catalyst dosage was 10 mg, the molar ratio of styrene/TBHP was 1 : 4, the reaction temperature was 80 °C, and the reaction time was 8 h, the yield of styrene was 74.7 % and the conversion of styrene was 96.7 %, demonstrating that styrene oxide and benzaldehyde were the major products of the process. The cyclic stability of the catalyst was further assessed, and implied that the catalytic activity, selectivity, and the catalyst's properties fails to change significantly after five cycles, which further indicates the superior stability of the catalyst.

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Self‐Sustained‐Release Strategy Realizes Colloid Oriented Assembly to Fabricate Prussian Blue with Hierarchical Structure

Li,

Hu,

et al. 2024

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The controlled self‐assembly of nanomaterials has been a great challenge in nanosynthesis, especially for hierarchical architectures with high complexity. Particularly, the structural design of Prussian blue (PB) series materials with robustness and fast nucleation is even more difficult. Herein, a self‐sustained‐release strategy based on the slow release of metal ions from coordination ions is proposed to guide the assembly of PB crystals. The key to this strategy is the slow release by ligand, which can create ultra‐low concentrations of metal ions so as to provide the possibility to realize the surface charge manipulation of PB primary colloids. By adding electrolyte or changing the polarity of the solution, the surface charge regulation of PB colloid is realized, and the PB hierarchical structures with branch fractal structure (PB‐BS), octahedral fractal structure, and spherical fractal structure are effectively constructed. This work not only achieves the designability of the PB structure, but also synchronizes the functionalization during the PB assembly growth process by in situ encapsulation of the effective catalytic active component L‐Ascorbic acid. As a result, the assembled PB‐BS exhibits greatly enhanced catalytic activity and selectivity in styrene oxidation with the selectivity of oxidized styrene increasing from 35.6% (PB) to 80.5% (PB‐BS).

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Porous core–shell Fe3O4@CuSiO3 microsphere as effective catalyst for styrene epoxidation

Cited by 13 publications

References 70 publications

Preparation of Fe‐based magnetic‐core‐supported Co and Ni catalyst: application in viscosity reduction of heavy oil hydrocracking

Preparation of Fe‐based magnetic‐core‐supported Co and Ni catalyst: application in viscosity reduction of heavy oil hydrocracking

Fabrication and Characterization of Heterogeneous Sheet‐like Mesoporous Cu₃(PO₄)₂⋅3H₂O Catalysts and Selective Catalytic Oxidation of Styrene

Self‐Sustained‐Release Strategy Realizes Colloid Oriented Assembly to Fabricate Prussian Blue with Hierarchical Structure

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Porous core–shell Fe3O4@CuSiO3 microsphere as effective catalyst for styrene epoxidation

Cited by 13 publications

References 70 publications

Preparation of Fe‐based magnetic‐core‐supported Co and Ni catalyst: application in viscosity reduction of heavy oil hydrocracking

Preparation of Fe‐based magnetic‐core‐supported Co and Ni catalyst: application in viscosity reduction of heavy oil hydrocracking

Fabrication and Characterization of Heterogeneous Sheet‐like Mesoporous Cu3(PO4)2⋅3H2O Catalysts and Selective Catalytic Oxidation of Styrene

Self‐Sustained‐Release Strategy Realizes Colloid Oriented Assembly to Fabricate Prussian Blue with Hierarchical Structure

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Fabrication and Characterization of Heterogeneous Sheet‐like Mesoporous Cu₃(PO₄)₂⋅3H₂O Catalysts and Selective Catalytic Oxidation of Styrene