Direct oxidation of H-2 to H2O2 and decomposition of H2O2 over oxidized and reduced Pd-containing zeolite catalysts in acidic medium
Metadata of CSIR Papers
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| Title |
Direct oxidation of H-2 to H2O2 and decomposition of H2O2 over oxidized and reduced Pd-containing zeolite catalysts in acidic medium
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| Creator |
Choudhary, VR
Sansare, SD Gaikwad, AG |
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| Subject |
Chemistry, Physical
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| Description |
Both the conversion and H2O2 selectivity (or yield) in direct oxidation of H-2-to-H2O2 (using 1.7 mol% H-2 in O-2 as a feed) and also the H2O2 decomposition over zeolite (viz. H-ZSM-5, H-GaAlMFI and H-beta) supported palladium catalysts (at 22 degreesC and atmospheric pressure) are strongly influenced by the zeolite support and its fluorination, the reaction medium (viz. pure water, 0.016 M or 1.0 M NaCl solution or 0.016 M H2SO4, HCl, HNO3, H3PO4 and HClO4), and also by the form of palladium (Pd-0 or PdO). The oxidized (PdO-containing) catalysts are active for the H-2-to-H2O2 conversion and show very poor activity for the H2O2 decomposition. However, the reduced (Pd-0-containing) catalysts show higher H-2 conversion activity but with no selectivity for H2O2, and also show much higher H2O2 decomposition activity. No direct correlation is observed between the H-2-to-H2O2 conversion activity (or H2O2 selectivity) and the Pd dispersion or surface acidity of the catalysts. Higher H2O2 yield and lower H2O2 decomposition activity are, however, obtained when the non-acidic reaction medium (water with or without NaCl) is replaced by the acidic one.
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| Publisher |
KLUWER ACADEMIC/PLENUM PUBLNEW YORK233 SPRING ST, NEW YORK, NY 10013 USA
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| Date |
2011-09-24T10:02:16Z
2011-09-24T10:02:16Z 2002 |
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| Type |
Article
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| Identifier |
CATALYSIS LETTERS
1011-372X http://hdl.handle.net/123456789/24228 |
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| Language |
English
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