- Electrochemical preparation of peroxodisulfuric acid using boron doped diamond thin film electrodes
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We have investigated the electrochemical oxidation of sulfuric acid on boron-doped synthetic diamond electrodes (BDD) obtained by HF CVD on p-Si. The results have shown that high current efficiency for sulfuric acid oxidation to peroxodisulfuric acid can be achieved in concentrated H2SO4 (≥ 2 M) at moderate temperatures (8-10 °C). The main side reaction is oxygen evolution. Small amounts of peroxomonosulfuric acid (Caro's acid) have also been detected. A reaction mechanism involving hydroxyl radicals, HSO4- and undissociated H2SO4 has been proposed. According to this mechanism electrogenerated hydroxyl radicals at the BDD anode react with HSO4- and H2SO4 giving peroxodisulfate.
- Serrano,Michaud,Comninellis,Savall
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- Continuous electrooxdiation of sulfuric acid on boron-doped diamond electrodes
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This study reports on the electrochemical oxidation of highly concentrated sulfuric acid by Diachem boron-doped diamond electrodes. The scope of this work was to evaluate a proposed continuous electrooxidation process in order to prepare a resist removal
- Hippauf, Felix,D?rfler, Susanne,Zedlitz, Ralf,Vater, Alfred,Kaskel, Stefan
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- Ag2S2O8 meets AgSO4: the second example of metal-ligand redox isomerism among inorganic systems
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Valence (redox) isomerism based on electron exchange between a metal and a ligand is immensely rare in purely inorganic systems, with only one documented case, that of PbS2 which adopts two polymorphic forms corresponding to Pb(iv)(S2)2 and Pb(ii)(S22). Here we have taken advantage of metathetic reactions using salts of weakly coordinating anions and we have prepared for the first time Ag(i)2S2O8, silver(i) peroxydisulphate. The title compound crystallizes in the non-centrosymmetric Cc space group with partial disorder of the anionic sublattice. Ag(i)2S2O8 is a highly thermally unstable diamagnetic and colourless valence isomer of the antiferromagnetic and black Ag(ii)SO4, described by us in the past.
- Gilewski, Tomasz E.,Leszczyński, Piotr J.,Budzianowski, Armand,Mazej, Zoran,Grzelak, Adam,Jaroń, Tomasz,Grochala, Wojciech
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supporting information
p. 18202 - 18207
(2016/11/25)
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- Anhydrous processing of methane into methane-sulfonic acid, methanol, and other compounds
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Anhydrous processing to convert methane into oxygenates (such as methanol), liquid fuels, or olefins uses an initiator to create methyl radicals. These radicals combine with sulfur trioxide to form methyl-sulfonate radicals. These radicals attack fresh methane, forming stable methane-sulfonic acid (MSA) while creating new methyl radicals to sustain a chain reaction. This system avoids the use or creation of water, and liquid MSA is an amphoteric solvent that increasing the solubility and reactivity of methane and SO3. MSA from this process can be sold or used as a valuable chemical with no mercaptan or halogen impurities, or it can be heated and cracked to release methanol (a clean fuel, gasoline additive, and chemical feedstock) and sulfur dioxide (which can be oxidized to SO3 and recycled back into the reactor). MSA also can be converted into gasoline, olefins, or other valuable chemicals.
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(2008/06/13)
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