Direct synthesis of H2O2 on monometallic and bimetallic catalytic membranes using methanol as reaction medium
2005; Elsevier BV; Volume: 237; Issue: 2 Linguagem: Inglês
10.1016/j.jcat.2005.11.008
ISSN1090-2694
AutoresS. Melada, Francesco Pinna, Giorgio Strukul, Siglinda Perathoner, Gabriele Centi,
Tópico(s)Electrocatalysts for Energy Conversion
ResumoTubular catalytic membranes (TMCs) active in the direct synthesis of hydrogen peroxide were prepared, characterized, and tested using methanol as the reaction medium. Low hydrogen peroxide selectivity was found when only palladium was used as a catalyst, whereas palladium/platinum bimetallic samples gave higher productivity and selectivity, with an optimum molar ratio of 18. The H2O2 decomposition rate is influenced by the feed gases. O2 improves H2O2 stability, whereas H2 causes hydrogen peroxide to decompose at a higher rate. The most likely decomposition pathway should be the reduction of H2O2 to water by H2. Bromide ion was used as a promoter and when used in excess (60 ppm) causes a decrease in overall catalytic activity.
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