Hydroxyapatite-supported Manganese Oxides as Efficient Non-noble-metal Catalysts for Selective Aerobic Oxidation of Alcohols

摘要

In this article, hydroxyapatites (HAPs) with different Ca/P ratios have been synthesized as the supports to prepare the MnO_x/ HAP catalysts for the aerobic oxidation of alcohols. The catalytic activity is strongly influenced by the Ca/P ratio and the calcination temperature as they can affect the acid and basic properties and oxidation state of MnO_x of the catalysts. The optimized catalyst MnO_x/HAP-10 can catalyze various primary alcohols to the corresponding aldehydes selectively with excellent conversion (up to 100%), and can be easily recovered and reused at least four times without any appreciable loss of activity.