The pillared montmorillonite with high specific
surface of 217 m2g−1 (pilc) produced an effective support
to disperse catalytic active phases Cr and Pd by
impregnation.
Chromium impregnated pillared bentonite showed
high catalytic activity for the total oxidation. However,
strong deactivation took place after several hours at
600 °C, due to: (i) loss of Cr from the catalyst surface,
likely related to the formation of the volatile CrO2Cl2,
(ii) coke formation, (iii) collapse of the pillars.
The Pd-imp catalyst showed a stable high catalytic
activity for the conversion of chlorobenzene at 600 °C.
However, the chlorobenzene was partially converted to
hexachlorobenzene.