文摘
Potassium-type birnessite and lithium-containing manganese oxides were prepared by the polyol process. The Mn(III)/Mn(IV) mixed-valencies compounds are obtained through the controlled reduction of potassium permanganate in a basic water–diethylene glycol mixture at moderate temperature and very short reaction time, 70?°C and 10?min, respectively. Both solids are quite well crystallized and display high specific surface areas, 137 and 329?m2?g?, respectively. Several polyols with variable chain lengths have been used and it is shown that the nature of the polyol has a marked influence on the textural properties of the birnessite-type solid.