Abstract
Palladium catalysts supported on SO 3H-functionalized mesoporous silicas (denoted as Pd/SO 3H-MCM-41, Pd/SO 3H-MCM-48, Pd/SO 3H-MSU-1, Pd/SO 3H-SBA-15, and Pd/SO 3H-MCF) were applied to the direct synthesis of hydrogen peroxide from hydrogen and oxygen. For comparison, palladium catalysts supported on mesoporous silicas (denoted as Pd/MCM-41, Pd/MCM-48, Pd/MSU-1, Pd/SBA-15, and Pd/MCF) were also employed for the direct synthesis of hydrogen peroxide. Selectivity for hydrogen peroxide, yield for hydrogen peroxide, and final concentration of hydrogen peroxide over Pd/SO 3H-functionalized mesoporous silica catalysts were much higher than those over Pd/mesoporous silica catalysts. Yield for hydrogen peroxide increased with increasing acid density of Pd/SO 3H-functionalized mesoporous silica. Pd/SO 3H-functionalized mesoporous silicas efficiently served as an alternate acid source and as an active metal catalyst in the direct synthesis of hydrogen peroxide from hydrogen and oxygen.
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