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Maurya, Mannar R.; Kumar, Mukesh; Titinchi, Salam J.J.; Abbo, Hanna S.; Chand, Shri

doi:10.1023/a:1022619310956

Cited by 69 publications

(28 citation statements)

References 13 publications

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“…Such high selectivity has only been noticed with oxovanadium(IV) complexes of salen family [24] and VO-Y zeolite [33].…”

Section: Catalytic Activity Studiesmentioning

confidence: 99%

“…Oxovanadium complexes catalyzed various oxidation reactions such as oxidation of sulfides to sulfoxides [19,20], epoxidation reaction of different olefins [21,22], oxidation of alcohols [23] and hydroxylation of benzene and phenol to mono-and dihydroxybenzenes [24][25][26][27][28]. On the other hand vanadium Schiff bases complexes encapsulated in zeolite-Y were used as catalysts for hydroxylation reaction of phenols [24].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand vanadium Schiff bases complexes encapsulated in zeolite-Y were used as catalysts for hydroxylation reaction of phenols [24].…”

Section: Introductionmentioning

confidence: 99%

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Hydroxylation of Phenol Catalyzed by Oxovanadium(IV) of Salen-Type Schiff Base Complexes with Hydrogen Peroxide

et al. 2010

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Active and highly selective catalytic systems of oxovanadium(IV) salen-type have been prepared and characterized by various physico-chemical techniques. Substituted salen-type Schiff base ligands were prepared from 3-ethoxy salicylaldehyde with 1,2-diaminobenzene and 1,8-diaminonaphthalene abbreviated (EtOsalphen) and (EtOsalnaph), respectively. The catalytic activity of the complexes for hydroxylation of phenol to catechol and hydroquinone using H 2 O 2 as an oxidant has been studied. The best suited reaction conditions were obtained by considering the effect of solvent, concentration of substrate, reaction time, concentration of catalyst and temperature. Under the optimized reaction conditions, VO-(EtOsalphen) catalyst shows high conversion (71%) at a short reaction time (2 h) with selectivity of 92.5% towards catechol, while VO-(EtOsalnaph) complex also shows higher conversion (76.6%) after longer reaction time (6 h) with almost similar selectivity to catechol (94.2%).

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“…Such high selectivity has only been noticed with oxovanadium(IV) complexes of salen family [24] and VO-Y zeolite [33].…”

Section: Catalytic Activity Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydroxylation of Phenol Catalyzed by Oxovanadium(IV) of Salen-Type Schiff Base Complexes with Hydrogen Peroxide

et al. 2010

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“…easy separation of products, possibility of recovery and reuse and designing continuous processes, there is considerable academic and industrial interest in the heterogenization of well-defined homogeneous catalysts [1][2][3][4]. There are various methods for converting a homogeneous catalyst to heterogeneous one such as anchoring of the active catalytic site on a solid support possessing large surface area [5][6][7][8][9][10][11], and encapsulation of homogeneous catalysts into the porous supports such as zeolites and mesoporous materials [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Immobilization of a molybdenum-glycine Schiff base complex within the nanocages of zeolite Y with flexible ligand method

2016

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Immobilization of a molybdenum-glycine Schiff base complex onto the supercages of zeolite Y was achieved through the flexible ligand method. The prepared material was characterized by different physicochemical techniques. FT-IR spectroscopy confirmed the immobilization of the complex onto the nanocages of zeolite Y. X-ray diffraction analysis revealed that textural properties of zeolite Y support were preserved during the immobilization process. Nitrogen adsorption-desorption analysis demonstrated the decrease in surface area of the prepared material in comparison with parent zeolite Y. Inductively coupled plasma optical emission spectroscopy showed the presence of 0.75 mmol g -1 molybdenum in the final material. The obtained material exhibited high catalytic activity, stability, and recyclability in the epoxidation of olefins with tert-butylhydroperoxide as oxidant.

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“…As a continuation of research on catalyzed hydroxylation of phenol [18][19][20][21][22][23][24][25], the present work describes the synthesis and physicochemical characterization of the encapsulated Cu(II), Fe(III) and Bi(III) complexes of 2,4-dihydro-4-[(2-hydroxyphenyl)-methylene]amino]-3H-1,2,4-triazole-3-thione ligand, abbreviated as [sal(thiotriazol)], in zeolite-Y. To the best of our knowledge, this is a first report on using thio-Schiff base complexes encapsulated in the supercages of zeolite-Y for phenol hydroxylation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Catalytic Activity of Cu(II), Fe(III) and Bi(III) Complexes of Thio-Schiff Base Encapsulated in Zeolite-Y for Hydroxylation of Phenol

Abbo

Titinchi

2009

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Coordination of 4-{[(1E)-(2-hydroxyphenyl) methylene]amino}-2,4-dihydro-3H-1,2,4-triazole-3-thione, [sal(thiotriazol)], with M-exchanged zeolite-Y (M = Cu(II), Fe(III) and Bi(III)) leads to the encapsulation of the metal complexes in the supercages of zeolite-Y by flexible ligand method. The prepared encapsulated metal complexes have been characterized by physico-chemical techniques, which indicated that the complexes were effectively encapsulated inside the supercages of Na-Y, without any modification of the morphology and structure of the zeolite. 3D model structure generated for these complexes suggests that zeolite-Y can accommodate these complexes in the FAU supercages without any strain. The catalytic activity of all the catalysts towards the hydroxylation of phenol was evaluated under heterogeneous conditions using hydrogen peroxide as an oxidant. Under the optimized conditions, these catalysts show moderate activity with excellent selectivity ([95%) towards catechol. These catalysts were stable in hydroxylation of phenol and have been reused a further three times after recovering. The results reflect the reusability of the catalysts, as no significant loss in their catalytic activity was noticed.

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Cited by 69 publications

References 13 publications

Hydroxylation of Phenol Catalyzed by Oxovanadium(IV) of Salen-Type Schiff Base Complexes with Hydrogen Peroxide

Hydroxylation of Phenol Catalyzed by Oxovanadium(IV) of Salen-Type Schiff Base Complexes with Hydrogen Peroxide

Immobilization of a molybdenum-glycine Schiff base complex within the nanocages of zeolite Y with flexible ligand method

Synthesis and Catalytic Activity of Cu(II), Fe(III) and Bi(III) Complexes of Thio-Schiff Base Encapsulated in Zeolite-Y for Hydroxylation of Phenol

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