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Control of selectivity in phenol hydroxylation using microstructured catalytic wall reactors

Paper ID Volume ID Publish Year Pages File Format Full-Text
44158 46005 2007 9 PDF Available
Title
Control of selectivity in phenol hydroxylation using microstructured catalytic wall reactors
Abstract

Selective hydroxylation of phenol to benzenediols with hydrogen peroxide aqueous solution over titanium silicalite-1 (TS-1) catalyst was performed using microstructured catalytic wall reactors. We investigated effects on the reaction results of various reaction conditions, such as reactant conversion and product selectivities were investigated. The regioselectivity of the parallel reactions, i.e., the molar ratio of para-diol (hydroquinone) to ortho-diol (catechol), is known to be dependent on the reaction parameters, such as temperature and reactant concentrations. In this study, we found that the selectivity also depends on the characteristics of the microreactor, such as catalyst placement and sizes of microchannels, which contributed significantly to the reactant concentrations on the catalyst surface. Especially, the selectivities changed markedly with increases in the height of microchannels. The results indicated that the regioselectivities could be arranged linearly as a function of Sh number, expressed by the velocity u and the design parameters of the microreactor, i.e., microchannel height H and microchannel length L.

Graphical abstractThe effects of phenol hydroxylation on the regioselectivity (the molar ratio of hydroquinone to catechol) using catalytic microreactors were investigated. The regioselectivity depends on the characteristics of the microreactor, such as catalyst placement and sizes of microchannels, and could be arranged linearly as a function of Sh number, expressed by the velocity u, microchannel height H, and microchannel length L.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Microreactors; Heterogeneous catalyst; Selective oxidation; Hydroxylation of phenol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 327, Issue 2, 15 August 2007, Pages 278–286
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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