Abstract
Solid acid property derived from loading phosphate and sulfate ions on silica, and their catalytic property will be described. Silica is neutral, neither acidic nor basic, and non-active to olefin isomerizations. The surface of silica was found to turn into very strongly acidic by being exchanged with these ions. Silica modified with phosphate ions was considerably active for 1-butene isomerization comparable to that modified by sulfate ions. The mechanism for the appearance of acid sites was thought to be the same to both cases.
