Hydrodechlorination of 4-chlorophenol in aqueous phase with Pt–Al pillared clays using formic acid as hydrogen source

Catalysts based on pillared clays with Al and Pt were synthesized from a commercial bentonite and tested for catalytic hydrodechlorination (HDC) using 4-chlorophenol (4-CPhOH) as the target compound and formic acid as the hydrogen source. Stable Pt–Al pillared clays were obtained, showing a high act...

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Bibliographic Details
Published in:Applied clay science Vol. 45; no. 4; pp. 206 - 212
Main Authors: Molina, C.B., Calvo, L., Gilarranz, M.A., Casas, J.A., Rodriguez, J.J.
Format: Journal Article
Language:English
Published: Elsevier B.V 01-08-2009
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Summary:Catalysts based on pillared clays with Al and Pt were synthesized from a commercial bentonite and tested for catalytic hydrodechlorination (HDC) using 4-chlorophenol (4-CPhOH) as the target compound and formic acid as the hydrogen source. Stable Pt–Al pillared clays were obtained, showing a high activity and a strong fixation of the active phase to the support. The influence of the method of introduction of Pt in the pillared clay (ion-exchange or impregnation) and the Pt content in the catalytic activity was checked. Likewise, operating variables such as reaction temperature, catalyst concentration and formic acid to 4-CPhOH molar ratio were studied; higher values of these variables gave rise to a higher 4-CPhOH conversion to phenol. An important deactivation of the catalyst was observed, probably due to the formation of carboneous deposits since no appreciable Pt leaching was detected.
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content type line 23
ISSN:0169-1317
1872-9053
DOI:10.1016/j.clay.2009.06.006