Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 247, Issue 1-2, Pages 73-79Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2005.11.037
Keywords
hydroxylation of phenol; catechol; hydroquinone; Y zeolite; fixed-bed flow reactor
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The catalysts, Fe-NaY, Co-NaY and Fe-Co-NaY, were prepared by ion-exchange of NaY through the wet method, and characterized. Their catalytic performance was evaluated for the hydroxylation of phenol between 30 and 90 degrees C. The Fe-Co-NaY catalyst showed higher activity than either Fe-NaY or Co-NaY catalysts. The optimum temperature was found to be 70 degrees C. The reaction conditions, phenol/H2O2, water/phenol and WHSV, were found to remarkably influence the activity of the catalysts. Under the optimum reaction conditions, 21.8% phenol conversion was obtained with 44.8% selectivity to catechol, and 16.5% to hydroquinone. Based on the high phenol conversion over Fe-Co-NaY compared to Fe-NaY and Co-NaY catalysts, it was suggested that well-dispersed Fe with optimum loading was the requirement for high phenol conversion and products selectivity. The long-run catalytic test for 44 h confirmed the absence of leaching of metal ion from the pores of Fe-Co-NaY catalyst. The reaction was carried Out in a fixed-bed now reactor, which could be a convenient solution to the problem of the batch type reactor in industrial applications. (c) 2005 Elsevier B.V. All rights reserved.
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