PRODUCTION OF INORGANIC POROUS BODY

摘要

PROBLEM TO BE SOLVED: To impart a pore structure having the desired median pore diameter and narrow distribution with high reproducibility by dissolving a thermally decomposable compd. in a reactive soln., forming gel having a solvent-rich phase giving macropores by a sol-gel process and heating the wet bulky gel. SOLUTION: A thermally clecomposable compd. is dissolved in a reactive soln. and gel consisting of a three-dimensional network solvent-rich phase giving macropores of >=100nm average diameter and an inorg. material-rich skeleton phase having pores in the surface is formed by a sol-gel process. The compd. dissolved in the reactive soln. is thermally decomposed by heating the wet gel to modify the fine structure of the gel and then the gel is dried and heated. The inorg. material is preferably silica and the compd. is preferably an amide compd. making the reactive soln. basic by thermal decomposition, e.g. urea.