“…Since 1994, we have synthesized metal oxide aerogels of alumina, chromia, iron oxide, magnesia, niobia, tin oxide, titania, ruthenium oxide, and carbon [1,2,5,[8][9][10][11][12]. Various unitary, binary and/or ternary composite aerogels have been employed as catalysts for a wide range of heterogeneous catalytic reactions including hydrogenation, selective oxidation, complete oxidation, ammoxidation, oxidative coupling, photodecomposition, and reforming [3,4,9,[13][14][15][16][17][18][19]. Synthetic modification was conducted by controlling the rates of hydrolysis and polymerization in order for composite aerogels to have appropriate homogeneity.…”