A New Type Hydrogen Permeable Membrane and Application for H2O2 Synthesis

摘要

Development of a hydrogen permeable membrane reactor in chemical process has been desired because of a great reduction of energy consumption. Previous studies were limited to Pd membranes. A new type of hydrogen permeable membrane layered three sheets (a reduction-Pt-catalyst sheet | a proton and electron co-conductive sheet | an oxidation-Ptcatalyst sheet) was developed. The middle sheet was prepared by casting a paste of carbon powder and Nafion solution. When a gas mixture of H2 and He (1:1) was introduced to the oxidation-catalyst compartment at 298 K, a high concentration of H2 was observed in the reduction-catalyst compartment, a maximum H2/He ratio as 217. H2 selectively permeated through the membrane. This concept was applied for synthesis of H2O2. When O2 and H2 were respectively introduced to the Co-N-C reduction-catalyst and the Pt oxidation-catalyst, production of a pure H2O2 aqueous solution of 3.8 mol dm~(-3) was succeeded with a good selectivity as 42% based on H2 at 278 K.