Microporous Structure of Titanium Oxide Prepared by a Salt Catalytic Sol–Gel Process

A microporous structure (dpore < 1 nm) of titanium oxide was synthesized by a salt catalytic sol–gel process of dilute titanium tetra-n-butoxide (Ti(n-C4H9O)4) and H2O solution without any template molecule. The specific surface area of titanium oxide after the calcinations at 300–350 °C was 310 m2 g−1. It decreased significantly by calcinations above 400 °C because the microporous structure collapsed with crystallization into anatase.