Hydrosilylations of carbonylcompounds were performed on the surfaces of solid acids and bases. Strongly acidic clays efficiently catalyzed the reduction of aldehydes and ketones with trialkylsilanes (e.g. Et3SiH) to afford symmetrical ethers or hydrocarbons, depending upon the characters of substituents around carbonyl groups. Reduction-resistant ketone like 4,4′-dimethoxybenzophenone was found to