Cu/Co-salen immobilized MCM-41: characterization and catalytic reactions

Karandikar, Prashant R.; Dhanya, K.C; Deshpande, S. B.; Chandwadkar, A.J.; Sivasanker, S.; Agashe, M. S.

doi:10.1016/j.catcom.2003.11.015

Cited by 83 publications

(38 citation statements)

References 16 publications

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“…Moreover, their catalytic performance increased with the loading of the neat complexes until the chromium content reached 6.30%; however, with the further increase in the loading of the neat complexes, the catalytic performance decreased (see Entry 10~13). It had been accepted that homogeneous complexes tended to deactivate due to the formation of dimers or oligomers originating from their high local concentration of active complexes [31]. Thus, such obviously enhanced catalytic performance over the heterogenized catalysts could be attributed to the dispersion effect of the support.…”

Section: Catalytic Performancementioning

confidence: 99%

Base-Free Selective Oxidation of Glycerol over LDH Hosted Transition Metal Complexes Using 3% H2O2 as Oxidant

Wang

Shang

et al. 2016

Catalysts

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A series of transition metal sulphonato-Schiff base complexes were intercalated into Mg-Al layered-double hydroxides (LDHs). The obtained catalysts were characterized by FTIR, XRD, N 2 sorption, SEM and elemental analysis, and then were used in the selective oxidation of glycerol (GLY) using 3% H 2 O 2 as an oxidant. It was found that their catalytic performances were closely related to the loading of active complexes, the Schiff base ligands and the metal centers of the catalysts, as well as the reaction conditions. The optimal conversion of GLY was 85.0%, while the selectivity of 1,3-dihydroxyacetone (DHA) was 56.5%. Moreover, the catalysts could be reused at least 10 times.

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Section: Catalytic Performancementioning

confidence: 99%

Base-Free Selective Oxidation of Glycerol over LDH Hosted Transition Metal Complexes Using 3% H2O2 as Oxidant

Wang

Shang

et al. 2016

Catalysts

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“…The major product, styrene oxide, was formed with 90% selectivity in the above reaction conditions. Many efficient heterogeneous copper catalysts have been reported for the styrene epoxidation with TBHP [35,[49][50][51][52][53]. However, this catalytic system was superior to reaction time [50][51][52][53], conversion [49,50], selectivity [35,[49][50][51]53], and reaction temperature [50] in comparison to others.…”

Section: Catalytic Activity In the Epoxidation Of Styrenementioning

confidence: 98%

“…Recently, copper complexes have been widely used in oxidation reactions under heterogeneous phase [34][35][36]. Heterogeneous Schiff base complexes containing donor atoms such as oxygen and nitrogen have been investigated for alkene epoxidation [37].…”

Section: Introductionmentioning

confidence: 99%

Olefin epoxidation with tert-butyl hydroperoxide catalyzed by functionalized polymer-supported copper(II) Schiff base complex

et al. 2011

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A new polymer-supported Cu(II) Schiff base complex has been synthesized and characterized by elemental (including metal) analysis, FT-IR spectroscopy, UV-Vis diffuse reflectance spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The catalytic performance of this complex was evaluated in the epoxidation of styrene in acetonitrile/N,N-dimethylformamide (9:1) mixture with 70% tert-butyl hydroperoxide as an oxidizing agent under liquid phase reaction conditions for selective synthesis of styrene oxide. Suitable reaction conditions have been optimized by considering the effects of various reaction parameters such as temperature, reaction time, solvent, oxidant, catalyst amount, and styrene to hydroperoxide molar ratio for the maximum conversion of styrene as well as selectivity of styrene oxide. We have also investigated the epoxidation reaction of various olefins under the optimized reaction conditions. Comparison between catalytic activities of the polymer-supported Cu(II) Schiff base complex and its homogeneous analogue showed that the polymer-supported catalyst was more active. This heterogeneous complex was reused for five times. The selectivity of the heterogeneous catalyst does not change even after five times of reusing.

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“…However, such homogeneous complexes suffered from the drawbacks of poor catalyst recovery and product separation [4]. Furthermore, the easy formation of l-oxo dimers and other polymeric species in homogeneous systems also led to irreversible catalyst deactivation [3,[5][6][7][8][9]. Therefore, in the past decades, much effort has been paid to the binding of homogeneous complexes to various supports such as molecular sieves [7][8][9], ion exchange resins [10], polymeric membranes [11] and layered-double hydroxides [12].…”

Section: Introductionmentioning

confidence: 99%

“…Among them, transition metal Schiff base complexes, especially the salen complexes containing flexible ethylenediamine backbone in resemblance of enzymatic catalysis are eye-catching due to the drastic change in the reactivity and special selectivity to a desired product [2,3]. However, such homogeneous complexes suffered from the drawbacks of poor catalyst recovery and product separation [4].…”

Section: Introductionmentioning

confidence: 99%

Surface-modified Improvement in Catalytic Performance of Cr(salen) Complexes Immobilized on MCM-41 in Solvent-Free Selective Oxidation of Benzyl Alcohol

Wang

et al. 2007

Catal Lett

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A series of typical methyl regulators were used to finely modify the Cr(salen) complex immobilized on MCM-41. Such immobilized complexes were effective catalysts for solvent-free selective oxidation of benzyl alcohol (BzOH) with 30% hydrogen peroxide (H 2 O 2 ), and they all exhibited much higher catalytic performance than their homogeneous analogue. Simultaneously, the introduction of methyl regulators was found to significantly improve the catalytic performance of immobilized complexes by modifying their surface properties. The optimal BzOH conversion reached 65.0% with 100% selectivity to benzaldehyde (BzH).

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Cu/Co-salen immobilized MCM-41: characterization and catalytic reactions

Cited by 83 publications

References 16 publications

Base-Free Selective Oxidation of Glycerol over LDH Hosted Transition Metal Complexes Using 3% H2O2 as Oxidant

Base-Free Selective Oxidation of Glycerol over LDH Hosted Transition Metal Complexes Using 3% H2O2 as Oxidant

Olefin epoxidation with tert-butyl hydroperoxide catalyzed by functionalized polymer-supported copper(II) Schiff base complex

Surface-modified Improvement in Catalytic Performance of Cr(salen) Complexes Immobilized on MCM-41 in Solvent-Free Selective Oxidation of Benzyl Alcohol

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