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Regeneration of TS-1 Catalyst During Phenol Hydroxylation(Calcination temperature dependence)  

Kwon, Song Yi (Green Chemistry Division, KRICT)
Yoon, Songhun (Green Chemistry Division, KRICT)
Um, Kyung Sub (Sunkyung Watech)
Lee, Jae Wook (Department of Chemical and Biomolecular Engineering, Sogang University)
Lee, Chul Wee (Green Chemistry Division, KRICT)
Publication Information
Korean Chemical Engineering Research / v.48, no.6, 2010 , pp. 679-683 More about this Journal
Abstract
In this study, calcination temperature dependence of TS-1 catalyst was investigated in the hydroxylation of phenol with hydrogen peroxide during the regeneration of catalyst. Catalyst was regenerated 5 times by calcining at $550^{\circ}C$ and $700^{\circ}C$, respectively. When the catalyst was regenerated at $550^{\circ}C$ after 5th regeneration phenol conversion was decreased from 22.9% to 15.1% and at $700^{\circ}C$ after 5th regeneration phenol conversion was decreased from 22.9% to 18.8%. For formation ratio of catechol/hydroquinone was increased from 1.28 to 1.45 after 5th regeneration at $550^{\circ}C$, and from 1.28 to 1.20 after 5th regeneration at $700^{\circ}C$. The main reasons for deactivation of the catalyst were suggested by analyzing chemical/physical properties with XRD, UV-vis spectra, $N_2$ adsorption/desorption and TGA, and evaluating the catalytic activity such as phenol conversion and product selectivity.
Keywords
Phenol; Hydrogen Peroxide; TS-1; Regeneration; Calcination;
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