KINETICS OF THE ALKYLATION OF PHENOL WITH METHANOL OVER CATALYSTS DERIVED FROM HYDROTALCITE-LIKE ANIONIC CLAYS

Vapor phase alkylation of phenol with methanol was carried out over ca talysts derived from a series of hydrotalcite (HT)-like compounds of t he form M(II)Al-HT; where M(II)= Mg, Mn, Co, Ni, Cu and Zn with M(II)/ Al atomic ratios of2-5, The kinetic parameters such as rate constant ( k), apparent activation energy (E-a) and Arrhenius frequency factor (A (o)) for the disappearance of phenol were evaluated employing a power law equation assuming pseudo-first order kinetics. The kinetic paramet ers were found to be in good agreement with phenol conversion. The exi stence of the compensation effect between E-a and In A(o) was tested.