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Pretreatment Effects on the Catalytic Activity of Jordanian Bentonite

Published online by Cambridge University Press:  01 January 2024

Sabri Mahmoud ,
Ayman Hammoudeh  and
Mousa Al-Noaimi
Sabri Mahmoud*
Affiliation:
Chemistry Department, Yarmouk University, Irbid, Jordan
Ayman Hammoudeh
Affiliation:
Chemistry Department, Yarmouk University, Irbid, Jordan
Mousa Al-Noaimi
Affiliation:
Chemistry Department, Yarmouk University, Irbid, Jordan
*
*E-mail address of corresponding author: smahmoud@yu.edu.jo
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Abstract

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De-tert-butylation of 2-tert-butylphenol was carried out over thermally-treated and acid-treated Jordanian bentonite clay samples. This reaction was found to follow first-order kinetics for all clay samples with different pretreatment procedures. The apparent rate constant, k, was also determined, and found to depend on the pretreatment. Thermal pretreatment at temperatures up to 250°C has an enhancing effect on surface acid sites. The total surface acidity (Ho <4.8) and the concentration of strong acid sites peaked at 250°C. Also, as a result, the maximum catalyst activity was obtained with samples treated at this temperature. Acid pretreatment with 0.10 M HCl, 1.0 M H2SO4 or 1.0 M H3PO4, followed by thermal treatment at 250°C produced the best enhancement effect on the surface acidity and catalytic activity.

Keywords

AcidBentoniteButylphenolCatalystClayDebutylationMontmorilloniteThermal
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 1 , February 2003 , pp. 52 - 57
Copyright
Copyright © 2003, The Clay Minerals Society

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