Direct synthesis of H2O2 on monometallic and bimetallic catalytic membranes using methanol as reaction medium |
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| Affiliation: | 1. Department of Chemistry, University Ca'' Foscari, INSTM Consortium R.U. of Venice, Dorsoduro 2137, 30123 Venezia, Italy;2. Department of Industrial Chemistry and Materials Engineering, University of Messina, INSTM Consortium R.U. of Messina, Salita Sperone 31, 98166 Messina, Italy;1. Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon 305-701, Republic of Korea;2. Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea;1. Benha University, Faculty of science, Chemistry Department, Benha, Egypt;2. Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City 11884, Cairo, Egypt;3. Building Physics and Environment Institute, Housing and Building National Research Center (HBRC), Dokki, Giza, Egypt;4. Department of Chemistry, Faculty of Science (Girls Branch), Al-Azhar University, Nasr City, Cairo, Egypt;1. School of Water Resources and Environment, China University of Geosciences Beijing, Key Laboratory of Groundwater Circulation and Environmental Evolution (China University of Geosciences Beijing), Ministry of Education, Beijing 100083, China;2. School of Engineering, The University of Edinburgh, The King''s Buildings, Edinburgh EH9 3JL, UK;3. College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China |
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| Abstract: | Tubular 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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