Synthesis, characterization and liquid-phase hydroxylation of phenol with hydrogen peroxide over host (nanopores of zeolite-Y)/guest (oxovanadium(IV) complexes of tetraaza macrocyclic ligands) nanocatalyst

Ruthenium(III) and palladium(II) complexes of 2-methylbenzimidazole (Mebzlh) ligand encapsulated in the super cages of zeolite-Y and ZSM-5 have been synthesized and characterized by various physico-chemical measurements. A suitable reaction condition has been optimized for [Ru(Mebzlh)]-Y by considering the effect of various parameters such as different solvents, concentration of substrate, reaction time and amount of oxidant etc., for the maximum conversion of phenol to a mixture of catechol and hydroquinone. The results obtained showed that selectivity for the catechol formation is ca. 85%, even though the conversion of phenol varies in the order [Ru(Mebzlh)]-Y (35%) > [Pd(Mebzlh)]-Y (15 %) > [Ru(Mebzlh)]- ZSM-5(10 %) > [Pd(Mebzlh)]- ZSM-5 (2 %) after 6 h of reaction time.

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Liquid-phase catalytic hydroxylation of phenol using metal crosslinked alginate catalysts with hydrogen peroxide as an oxidant

Journal of Molecular Catalysis A Chemical ◽

10.1016/j.molcata.2014.04.006 ◽

2014 ◽

Vol 391 ◽

pp. 66-73 ◽

Cited By ~ 16

Author(s):

Fengwei Shi ◽

Li Mu ◽

Peng Yu ◽

Jianglei Hu ◽

Long Zhang

Keyword(s):

Hydrogen Peroxide ◽

Liquid Phase ◽

Hydroxylation Of Phenol

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Metal-Organic Frameworks in Oxidation Catalysis with Hydrogen Peroxide

Catalysts ◽

10.3390/catal11020283 ◽

2021 ◽

Vol 11 (2) ◽

pp. 283

Author(s):

Oxana Kholdeeva ◽

Nataliya Maksimchuk

Keyword(s):

Hydrogen Peroxide ◽

Liquid Phase ◽

Selective Oxidation ◽

Metal Organic Frameworks ◽

Short Review ◽

Catalytic Performance ◽

Oxidation Catalysis ◽

Catalyst Stability ◽

Aqueous Hydrogen Peroxide ◽

Metal Organic

In recent years, metal–organic frameworks (MOFs) have received increasing attention as selective oxidation catalysts and supports for their construction. In this short review paper, we survey recent findings concerning use of MOFs in heterogeneous liquid-phase selective oxidation catalysis with the green oxidant–aqueous hydrogen peroxide. MOFs having outstanding thermal and chemical stability, such as Cr(III)-based MIL-101, Ti(IV)-based MIL-125, Zr(IV)-based UiO-66(67), Zn(II)-based ZIF-8, and some others, will be in the main focus of this work. The effects of the metal nature and MOF structure on catalytic activity and oxidation selectivity are analyzed and the mechanisms of hydrogen peroxide activation are discussed. In some cases, we also make an attempt to analyze relationships between liquid-phase adsorption properties of MOFs and peculiarities of their catalytic performance. Attempts of using MOFs as supports for construction of single-site catalysts through their modification with heterometals will be also addressed in relation to the use of such catalysts for activation of H2O2. Special attention is given to the critical issues of catalyst stability and reusability. The scope and limitations of MOF catalysts in H2O2-based selective oxidation are discussed.

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