Highly effective methylated Ti MCM-41 catalyst for cyclohexene oxidation

Roy, Sushanta Kumar; Dutta, Debajani; Talukdar, Anup Kumar

doi:10.1016/j.materresbull.2018.03.017

Cited by 22 publications

(6 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high conversion of cyclohexene in acetonitrile solvent could be due to its high dipole moment. 72 Since it is polar aprotic solvent, it is expected to increase the substrate concentration to favour the reaction kinetics and hence cyclohexene conversion could be increased. The amount of acetonitrile was further increased to 10 ml and 15 ml to investigate its effect on cyclohexene conversion and products selectivity.…”

Section: Catalytic Activity Of the Rgo/fe 3 O 4 Nanocompositesmentioning

confidence: 99%

Magnetically separable and reusable rGO/Fe₃O₄ nanocomposites for the selective liquid phase oxidation of cyclohexene to 1,2-cyclohexane diol

et al. 2019

View full text Add to dashboard Cite

show abstract

Section: Catalytic Activity Of the Rgo/fe 3 O 4 Nanocompositesmentioning

confidence: 99%

Magnetically separable and reusable rGO/Fe₃O₄ nanocomposites for the selective liquid phase oxidation of cyclohexene to 1,2-cyclohexane diol

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The product yield decreased with the decline of temperature from 100°C to room temperature. According to the Arrhenius equation, the increase of reaction rate with temperature was expected [40]. For this reaction, the best result was obtained at 80°C.…”

Section: Effect Of Temperaturementioning

confidence: 93%

“…This band is due to the stretching vibrations of Si-OH or Si-O-M (M = metal) [39][40], indicating the heteroatom incorporation into the framework of mesoporous materials [41]. This band is weak for parent MCM-41 [40].…”

Section: Ft-irmentioning

confidence: 99%

“…For as-synthesized Cu-MCM-41, The vibration bands at 959-970 cm − 1 are due to the incorporation of metal into the silica framework. This band is due to the stretching vibrations of Si-OH or Si-O-M (M = metal) [39][40], indicating the heteroatom incorporation into the framework of mesoporous materials [41]. This band is weak for parent MCM-41 [40].…”

Section: Ft-irmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and characterization of copper deposited on MCM-41 synthesized by co-condensation and post-synthesis grafting methods for the synthesis of 5‑substituted 1H‑tetrazoles in water

Ghadermazi¹,

Molaei²,

Khorami³

2022

Preprint

View full text Add to dashboard Cite

Cu-functionalized mesoporous MCM-41 materials were synthesized via two different types of post-functionalization modification of MCM-41, without the ligand (MCM-41@Cu) and with ligand (MCM-41@Histidine@Cu). Cu-functionalized mesoporous MCM-41 sample was also prepared directly via co-condensation of CuCl2 and decyltrimethylammonium bromide (DTAB) with tetraethyl orthosilicate (TEOS) (Cu-MCM-41). The textural properties of the samples were characterized by powder X-ray diffraction (XRD), Fourier transforms infrared (FTIR) spectra, nitrogen adsorption − desorption, transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The results show that the structure of MCM-41 persisted after modification. These catalysts are efficient catalysts for the synthesis of 5-substituted 1Htetrazoles in water. Cu-functionalized mesoporous MCM-41 materials displayed high catalytic performance at low-temperature. Cu-functionalized MCM-41 sample synthesized with direct co-condensation method displayed better catalytic activity compared to Cu-functionalized mesoporous MCM-41 materials prepared with post-synthesis grafting methods. These catalysts can be easily recovered.

show abstract

“…Considering Ti (IV) species to be the active sites in TiMCM-41 catalyst in the oxidation of cyclohexene to cyclohexene epoxide, a mechanism in three steps was proposed for surface reaction [55]. The main reaction step involved the reaction of Ti single sites with H 2 O 2 to form titanium hydroperoxide, which further reacts with cyclohexene molecules to form cyclohexene epoxide in a concerted manner.…”

Section: Incorporated Metal Active Sites With Redox Propertiesmentioning

confidence: 99%

Catalytic Behavior of Metal Active Sites From Modified Mesoporous Silicas in Oxidation of Organic Compounds

Pârvulescu¹

2020

Redox

View full text Add to dashboard Cite

The ordered mesoporous silicas containing transition metals are versatile catalytic materials for oxidation of a wide range of organic compounds. In order to obtain active catalysts, different active redox metal sites have been introduced into specific locations (mesoporous channels and framework) of ordered mesoporous silicas (OMSs). All the reported results evidenced that localization of metal ions, their interaction with another metal (bimetallic catalysts) and the support, with typical properties of the ordered mesoporous silica, influenced the oxidation state, respectively their redox properties. To support this, the results regarding the specific properties of transitional metals in the ordered structure of silica, obtained using various characterization methods, were presented. The activity of metal sites in the oxidation reactions was evidenced in various applications carried out in the liquid or gaseous phase. The oxidation of various organic compounds in liquid phase with H 2 O 2 (especially aromatic compounds and of alcohols) and in gas phase with oxygen from air was presented for a variety of metal-modified OMSs. The active sites and possible reaction mechanisms were presented for some catalytic systems. The immobilization of multiple metal active species on new ordered porous frameworks and their synergistic interactions remain topics of interest in the future.

show abstract

Highly effective methylated Ti MCM-41 catalyst for cyclohexene oxidation

Cited by 22 publications

References 36 publications

Magnetically separable and reusable rGO/Fe₃O₄ nanocomposites for the selective liquid phase oxidation of cyclohexene to 1,2-cyclohexane diol

Magnetically separable and reusable rGO/Fe₃O₄ nanocomposites for the selective liquid phase oxidation of cyclohexene to 1,2-cyclohexane diol

Synthesis and characterization of copper deposited on MCM-41 synthesized by co-condensation and post-synthesis grafting methods for the synthesis of 5‑substituted 1H‑tetrazoles in water

Catalytic Behavior of Metal Active Sites From Modified Mesoporous Silicas in Oxidation of Organic Compounds

Contact Info

Product

Resources

About

Highly effective methylated Ti MCM-41 catalyst for cyclohexene oxidation

Cited by 22 publications

References 36 publications

Magnetically separable and reusable rGO/Fe3O4 nanocomposites for the selective liquid phase oxidation of cyclohexene to 1,2-cyclohexane diol

Magnetically separable and reusable rGO/Fe3O4 nanocomposites for the selective liquid phase oxidation of cyclohexene to 1,2-cyclohexane diol

Synthesis and characterization of copper deposited on MCM-41 synthesized by co-condensation and post-synthesis grafting methods for the synthesis of 5‑substituted 1H‑tetrazoles in water

Catalytic Behavior of Metal Active Sites From Modified Mesoporous Silicas in Oxidation of Organic Compounds

Contact Info

Product

Resources

About

Magnetically separable and reusable rGO/Fe₃O₄ nanocomposites for the selective liquid phase oxidation of cyclohexene to 1,2-cyclohexane diol

Magnetically separable and reusable rGO/Fe₃O₄ nanocomposites for the selective liquid phase oxidation of cyclohexene to 1,2-cyclohexane diol