Effect of addition of divalent transition metal chlorides on the structureand thermal stability of lamellar silica synthesized by the neutral amine route
Rf. De Farias et C. Airoldi, Effect of addition of divalent transition metal chlorides on the structureand thermal stability of lamellar silica synthesized by the neutral amine route, J SOL ST CH, 149(1), 2000, pp. 113-119
The addition of divalent metal chlorides MCl2 (M = Mn, Co, Ni, Cu, Zn, Cd,
Hg) drastically affects the structure and thermal stability of lamellar sil
ica obtained through the neutral amine route using 1,12-diaminedodecane as
template molecule. These changes in properties are related to the coordinat
ion features, as well as the amount of cation employed. The enhancement of
the thermal stability of the modified lamellar silica is always independent
of the cation added, On the other hand, the thermal stability of the hexag
onal phase decreased. The occurrence of structural changes can be attribute
d to the reorientation of 1,12-diaminedodecane chains to allow cation coord
ination through nitrogen atoms, (C) 2000 Academic Press.