DEACTIVATION OF SILICA SURFACE WITH CYCLIC ORGANOSILICONS IN THE GAS-PHASE

In the paper gas phase deactivation of a silica surface with cyclic or ganosilicon compounds is described. The emphasize is put on the reacti vity of the modifiers and the low reactivity of octamethylcyclotetrasi loxane is evidenced. The effects of gas phase deactivation of the sili ca surface are compared with those of liquid phase processes. Cyclosil oxane and cyclosilazane modified surfaces are compared as well. Finall y a gas phase titration of strongly adsorbing sites is shown for some modified surfaces and the existence of a great variety of the sites on the surfaces is pointed out.