Synthesis and catalytic properties of macroporous SiO2-coated CNT-sieve-composite-supported 12-tungstophosphoric acid catalysts with dual pore structure for the Baeyer–Villiger oxidation of cyclic ketones under microwave irradiation

Wei, Yuting; Yang, Zhiwang; Zhao, Guohu; Yang, Wu

doi:10.1016/j.jcat.2019.01.007

Cited by 7 publications

(5 citation statements)

References 24 publications

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“…Apart from the advantages of microwave-assisted biodiesel production, it is not easy to upgrade from laboratory smallscale synthesis to commercial multi-ton plant capacity. The main drawback is associated with the depth of the penetration of microwave radiation into the absorbing materials, which is only a few centimeters, depending on their dielectric characteristics [113]. A summary of biodiesel production from residual palm oil using various homogeneous and heterogeneous catalysts is presented in Tab.…”

Section: Microwave-assisted Transesterificationmentioning

confidence: 99%

Comprehensive Review on Biodiesel Production from Palm Oil Mill Effluent

et al. 2021

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Biodiesel synthesis processes including pyrolysis, direct blending, transesterification, and advanced technologies such as microwave-and ultrasoundassisted and supercritical processes from palm oil mill effluent (POME) are reviewed to highlight the significance and advances in terms of process sustainability and cost. POME as the most contaminated waste can be effectively utilized for biodiesel production. Supercritical transesterification offers more advantages over the other processes including higher reaction rate, without catalyst constraint, producing pure glycerol, and simple product separation process. The addition of co-solvents like CO 2 should be investigated for supercritical biodiesel production from POME. Although POME is an inexpensive source to synthesize biodiesel, innovative processes are needed to maximize the oil recovery from POME. Optimization of transesterification parameters is required for high production yields and sustainable processing.

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Section: Microwave-assisted Transesterificationmentioning

confidence: 99%

Comprehensive Review on Biodiesel Production from Palm Oil Mill Effluent

et al. 2021

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“…Importantly, the resulting ionic liquid monomer not only can be easily polymerized but also produce a polymer with linear long chain quaternary ammonium structure. The reason for choosing H 3 PW 12 O 40 , H 4 SiW 12 O 40 as the suitable counter POM lies in: (1) two POM exhibited good performance in catalytic activity in BV oxidation via generate peroxo intermediate in situ with H 2 O 2 , and their oxidative activity could be regulated by the acidic content and acidity [15] and (2) two POM anions have the size of 1nm × 1 nm, together with their high negative charge density, which is beneficial for the adequate coating of PILs on their surfaces and the formation of an excellent amphiphilic microenvironment. On the other hand, two POM anions could function as pillar type nodes or crosslinking agents embedded and supported in the 2D net-like structure formed by the linear long chain polymeric quaternary ammonium cation and thereby create an open 3D network structure with hierarchical porosity.…”

Section: Synthesis and Characterization Of Two Ionic Self-assembliesmentioning

confidence: 99%

“…Due to the lower oxidation potential of H 2 O 2 , the catalyst is usually required to promote oxidation via carbonyl or H 2 O 2 activation. For example, heterogeneous catalysts based on Lewis acidic transition metal (like Sn [7,8], Fe [9], Mg [10], Mn [11]), sold acid [12], sulfonic acid functionalized silica nanoparticle [13], carboxylic multi-walled carbon nanotube [14], and macroporous CNT-sieve-composite-supported polyoxometalate [15] have been reported; however, these methods are confronted with the drawbacks of low activity or selectivity and complicated preparation processes, using high concentrations of H 2 O 2 and so on.…”

Section: Introductionmentioning

confidence: 99%

“…Catalysts 2020, 10, x FOR PEER REVIEW 2 of 11 macroporous CNT-sieve-composite-supported polyoxometalate [15] have been reported; however, these methods are confronted with the drawbacks of low activity or selectivity and complicated preparation processes, using high concentrations of H2O2 and so on. Polymeric ionic liquids (PILs), as a kind of designable multifunctional polyelectrolyte, combine the properties of polymer and ionic liquid.…”

Section: Introductionmentioning

confidence: 99%

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Additive-Free Baeyer–Villiger Oxidation of Cyclic Ketone Catalyzed by Carboxylic-Functionalized Poly(Ionic Liquids) and Polyoxometalate Ionic Self-Assemblies

Xue

Lin

et al. 2020

Catalysts

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Two carboxylic functionalized poly(ionic liquids) and polyoxometalate ionic self-assemblies with tunable amphiphilic and oxidative activity and porous structure were designed and synthesized. They were used as efficient heterogeneous catalysts exhibiting excellent catalytic activity and quite stable reusability in additive–free Baeyer-Villiger oxidation of cyclic ketones, directly using 30% H2O2 solution in liquids–phase. Under optimum conditions, the corresponding lactones were obtained with yields ranging from 59.6 to 90.5%. The unique combination of carboxylic group with polyoxometalate anion, amphiphilic property, and porous structure is revealed to be responsible for their excellent catalytic performances in oxidation.

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“…Substituted ferrocenyl imidazoles have also been employed as the catalyst for the synthesis of nitrogen-doped carbon nanotubes (N-CNTs) and N-CNT-metal nanocomposites [11, 29]. These compounds have produced carbon nanomaterials with improved thermal [30, 31], structural [32] and magnetic [33] properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structures and electrochemical properties of ferrocenyl imidazole derivatives

Labulo

Omondi

Nyamori

2019

Heliyon

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Six ferrocenyl imidazole derivatives substituted with -Cl, -NO2 and -CH3 on the 2-position of the 1H-imidazole ring have been synthesized. Of the six compounds, the di-substituted ferrocenes, i.e. compounds 4 (1,1′-ferrocenylmethyl(2-chloroimidazole)), 5 (1,1′-ferrocenyl(2-nitroimidazole)), and 6 (1,1′-ferrocenylmethyl(2-methylimidazole)) are reported for the first time. The structure-property relationships of compounds 4, 5 and 6 were investigated by means of UV-visible, FTIR, 1H-NMR, 13C-NMR spectroscopy and electrochemical studies. UV-visible analysis in acetonitrile showed that the π -π* band of compounds 2 (1-ferrocenylmethyl(2-nitroimidazole)) and 5 appeared at longer wavelength compared to 1 (1-ferrocenylmethyl(2-chloroimidazole)), 3 (1-ferrocenylmethyl(2-methylimidazole)), 4 and 6. This phenomenon is due to the different electronics around the imidazole moieties. In cyclic voltammetry analysis, all compounds exhibited a quasi-reversible redox wave for the ferrocenyl and imidazole moieties. Density functional theoretical (DFT) calculations with the B3LYP/6-311+G(d) basis set were performed on compounds 1–6, and the calculated HUMO-LUMO band gap energies correlated with those obtained from electrochemical and spectroscopic data. The X-ray crystallographic analysis highlighted the effect of electron-withdrawing and electron-donating substituents on the conformation of the cyclopentadienyl rings attached to the ferrocenyl moiety.

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Synthesis and catalytic properties of macroporous SiO2-coated CNT-sieve-composite-supported 12-tungstophosphoric acid catalysts with dual pore structure for the Baeyer–Villiger oxidation of cyclic ketones under microwave irradiation

Cited by 7 publications

References 24 publications

Comprehensive Review on Biodiesel Production from Palm Oil Mill Effluent

Comprehensive Review on Biodiesel Production from Palm Oil Mill Effluent

Additive-Free Baeyer–Villiger Oxidation of Cyclic Ketone Catalyzed by Carboxylic-Functionalized Poly(Ionic Liquids) and Polyoxometalate Ionic Self-Assemblies

Synthesis, crystal structures and electrochemical properties of ferrocenyl imidazole derivatives

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