UiO-66(Ce) metal-organic framework as a highly active and selective catalyst for the aerobic oxidation of benzyl amines

Nagarjun, Nagarathinam; Jacob, Manju; Varalakshmi, Perumal; Dhakshinamoorthy, Amarajothi

doi:10.1016/j.mcat.2020.111277

Cited by 29 publications

(19 citation statements)

References 71 publications

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“…As shown in Figure 5, the FTIR spectra of three Ce-MOF catalysts were similar with the band from 1376 to 1654 cm −1 corresponding to carboxylate groups and aromatic rings of trimesic acid or adsorbed water [34,48]. In MOF-BTC and UiO-66, the Ce-O vibration appeared at 539 and 516 cm −1 , respectively, while that of MOF-808 was observed at 572 cm −1 [32,49]. The difference indicated the different Ce-O distance [50], which indicated the coordination environment of Ce was different over three samples.…”

Section: Analysis Of Surface Chemical Propertiesmentioning

confidence: 59%

Excellent Catalytic Performance of Ce–MOF with Abundant Oxygen Vacancies Supported Noble Metal Pt in the Oxidation of Toluene

Liu

Chen²,

Chen

et al. 2022

Catalysts

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Metal organic framework (MOF) is a type of porous organic material. In this work, three catalysts loaded with noble metal Pt were prepared by NaBH4 reduction method with three different morphologies of Ce–MOF as carriers. Their physicochemical properties were characterized by XRD, Raman, FTIR, N2 adsorption, SEM, XPS, and TGA. The catalytic performances of different catalysts were evaluated via toluene oxidation and CO2 selectivity. Rod–shaped Pt/MOF–BTC exhibited best catalytic performance compared to Pt/MOF–808 and Pt/UiO–66, its T50 and T90 were 140 °C and 149 °C, respectively. After deducting the effect of specific surface, Pt/MOF–BTC still had the lowest apparent activation energy (62.8 kJ·mol−1), which is due to the abundant atomic Pt and oxygen vacancy content on its surface. After the reaction, the structure of Pt/MOF–BTC may become amorphous according to XRD results. Furthermore, the presence of amorphous structure had no effect on the catalytic activity of the catalyst. In the stability test of Pt/MOF–BTC to toluene oxidation, both toluene conversion and CO2 selectivity remained at 100%, and remained stable for 11 h. Moreover, Pt/MOF–BTC also had better resistance to high weight hourly space velocity (WHSV) or water resistance. The catalyst maintained high catalytic activity for 3 times reusability. This study provides valuable experience for the future work of MOF in the field of VOC catalytic oxidation.

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Section: Analysis Of Surface Chemical Propertiesmentioning

confidence: 59%

Excellent Catalytic Performance of Ce–MOF with Abundant Oxygen Vacancies Supported Noble Metal Pt in the Oxidation of Toluene

Liu

Chen²,

Chen

et al. 2022

Catalysts

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“…It can be seen from the scanning electron microscopy (SEM) images of UiO-66 and its derivatives that different kinds of UiO-66 nanoparticles demonstrate similar spherical crystal structures (Figure ). − More importantly, all types of UiO-66 nanoparticles have a certain degree of agglomeration, , but the nanoparticle grafted with SPA (UiO-66-SPA) demonstrates less tendency to aggregate with smaller nanoparticles (Figure d). Notably, although SPA chains have been grafted onto the UiO-66 particles, the particle size of UiO-66-SPA is only about one-third of that of UiO-66.…”

Section: Resultsmentioning

confidence: 99%

Ultrafast Poly(sodium methacrylate)-Grafted UiO-66-Incorporated Nanocomposite Membranes Enable Excellent Active Pharmaceutical Ingredient Concentration

Huang

Cheng

Bai

et al. 2021

Ind. Eng. Chem. Res.

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Membrane separation technology is an energy-efficient and green separation technology for purifying and concentrating active pharmaceutical ingredients (APIs) from organic solvents during the synthesis process. However, the lack of highly permeable materials with high rejection performance toward target molecules impedes the worldwide application of the membrane separation technology to reduce the cost of the separation process on a large scale. In the current study, we develop highly permeable thin-film nanocomposite (TFN) membranes through incorporating poly(sodium methacrylate) (SPA)-grafted UiO-66 into the polypyrrole selective layer, clarifying the effects of preparation conditions on the performance of the TFN membranes and optimizing the operation conditions on the separation performance of the TFN membranes. With finely tailored membrane structure and affinity between the TFN membranes and the solvents, the optimized TFN membranes demonstrate solution permeance as high as 88.8 L m −2 h −1 bar −1 with a rejection of about 99.9% toward octreotide acetate, exhibiting excellent rejection performance toward polypeptides and antibiotics. In the continuous operation mode, the TFN membranes still demonstrate stable permeance as high as 56.5 L m −2 h −1 bar −1 , which is about 1 order of magnitude higher than that of commercial polyamide membranes, showing strong potential in purifying and concentrating APIs from organic solvents.

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“…Analogous MOFs with UiO-66 frameworks were synthesized with different transition metal ions like Ti (IV), Hf (IV), Th (IV), U (IV), and Ce(IV) possessed high thermal and chemical stabilities. In this connection, Nagarjun et al (2021) have reported a UiO-66 (Ce) (9) metal-organic framework for the aerobic oxidation of benzyl amines. Synthesis of imines from amines conventionally requires catalyst and oxidant, but the separation of oxidant from the reaction mixture is tedious and not environmentally benign.…”

Section: Cu (Ii) Basedmentioning

confidence: 99%

“…)Nagarjun et al (2021) Ce4+ ions as active sites in UiO-66(Ce) Aerobic oxidation of benzyl amines Ni@MIL-125(Ti)-NH 2 (10)Chen et al. (2020) Schiff base nickel (II) complex acts as active catalytic site ethylene oligomerization L-proline grafted [Zr 6 O 6 (OH) 2 (tdc) 4 (CH 3 COO) 2 ], DUT-67pro (11) Nguyen et al (2018) L-proline chiral catalytic sites cyclohexanone to trans-β-nitrostyrene IRMOF-8 (12) Zinc nitrate tetrahydrate and 2OH) (hfipbb)] (14), AlPF-1 [In (O 2 C 2 H 4 ) 0.5 (hfipbb)] (15),InPF-11β and [Ga (OH) (hfipbb)] [16], GaPF-activity, the incorporation of metal NPs desirably enhances the catalytic activity and would lead to novel catalytic characteristics compared to their new counterparts.…”

mentioning

confidence: 99%

A Review on Metal-Organic Frameworks as Congenial Heterogeneous Catalysts for Potential Organic Transformations

Gangu

Jonnalagadda

2021

Front. Chem.

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Metal-organic frameworks (MOFs) have emerged as versatile candidates of interest in heterogeneous catalysis. Recent research and developments with MOFs positively endorse their role as catalysts in generating invaluable organic compounds. To harness the full potential of MOFs in value-added organic transformation, a comprehensive look at how these materials are likely to involve in the catalytic processes is essential. Mainstays of MOFs such as metal nodes, linkers, encapsulation materials, and enveloped structures tend to produce capable catalytic active sites that offer solutions to reduce human efforts in developing new organic reactions. The main advantages of choosing MOFs as reusable catalysts are the flexible and robust skeleton, regular porosity, high pore volume, and accessible synthesis accompanied with cost-effectiveness. As hosts for active metals, sole MOFs, modified MOFs, and MOFs have made remarkable advances as solid catalysts. The extensive exploration of the MOFs possibly led to their fast adoption in fabricating new biological molecules such as pyridines, quinolines, quinazolinones, imines, and their derivatives. This review covers the varied MOFs and their catalytic properties in facilitating the selective formation of the product organic moieties and interprets MOF’s property responsible for their elegant performance.

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UiO-66(Ce) metal-organic framework as a highly active and selective catalyst for the aerobic oxidation of benzyl amines

Cited by 29 publications

References 71 publications

Excellent Catalytic Performance of Ce–MOF with Abundant Oxygen Vacancies Supported Noble Metal Pt in the Oxidation of Toluene

Excellent Catalytic Performance of Ce–MOF with Abundant Oxygen Vacancies Supported Noble Metal Pt in the Oxidation of Toluene

Ultrafast Poly(sodium methacrylate)-Grafted UiO-66-Incorporated Nanocomposite Membranes Enable Excellent Active Pharmaceutical Ingredient Concentration

A Review on Metal-Organic Frameworks as Congenial Heterogeneous Catalysts for Potential Organic Transformations

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