IR SPECTROSCOPIC STUDY OF THE REACTION OF IRON(III) CHLORIDE VAPOR WITH PARTIALLY DEHYDROXYLATED AEROSIL

The successive reactions of the vapors of iron(III) chloride and water with samples of partially dehydroxylated silica (aerosil) in the proc ess of molecular layering were investigated in situ by IR spectroscopy , using a high-vacuum technique, in the range 3900-2300 cm-1 at temper atures below 573 K. It was shown that all silanol groups, apart from t hose in narrow pores, enter into reaction with FeCl3 on the condition that HCl is absent. In the presence of HCl, all other things being equ al, the degree of silanol group replacement depends on the partial pre ssure of HCl.