Liquid-Phase Catalytic Hydroxylation of Phenol Using Cu(II), Ni(II) and Zn(II) Complexes of Amidate Ligand Encapsulated in Zeolite-Y as Catalysts |
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Authors: | Mannar R Maurya Salam J J Titinchi Shri Chand |
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Affiliation: | (1) Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India;(2) Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India |
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Abstract: | Copper(II), nickel(II) and zinc(II) complexes of amidate ligand 1,2-bis(2-hydroxybenzamido)ethane(H2hybe) encapsulated in the super cages of zeolite-Y have been prepared and characterized by spectroscopic studies and thermal as well as X-ray diffraction (XRD) patterns. These complexes catalyze the liquid-phase hydroxylation of phenol with H2O2 to catechol as a major product and hydroquinone as a minor product. Considering the concentration of substrate and oxidant, amount of catalyst, temperature of the reaction and volume of solvent, a best-suited reaction condition has been optimized to get maximum hydroxylation. Under the optimized reaction conditions, Cu(hybe)]-Y has shown the highest conversion of 40% after 6 h, which is followed by Ni(hybe)]-Y with 37% conversion and Zn(hybe)]-Y has shown the poorest performance with 33% conversion. All these catalysts are more selective towards catechol formation ( 90%), irrespective of their catalytic performance. |
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Keywords: | [MH(hybe)] complexes zeolite-encapsulated metal complexes hydroxylation of phenol catechol and hydroquinone formation |
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