Properties of the material surfaces obtained by pyrolysis of alkanols on boron-enriched controlled porous glasses

Abstract

Controlled porous glasses (CPG) are often employed as packing materials for gas and liquid chromatography. The characteristic feature of CPG is the presence of surface boron atoms, the concentration of which can easily be changed by appropriate thermal treatment. The use of thermally treated CPG as a support in the pyrolysis of alcohols causes the formation of graphite in the carbon deposit obtained. The properties of thermally treated CPG and the same CPG with a carbon deposit on their surface was investigated by means of the hydrogenolysis reaction of n-butane. The results obtained suggest that the pyrolysis of a constant molar amount of alkanols differing in their chain lengths leads to blocking of the same centres on the CPG surface.