Abstract
The SO3 decomposition reaction in the H2SO4 decomposition process has an equilibrium conversion rate of 80% or higher at a reaction temperature of 800 °C, but the conversion decreases to about 30% at 600 °C. SO3 decomposition assisted with a membrane, i.e., SO3 decomposition membrane reactor, has been developed in order to improve the conversion at moderate temperatures (≤650 °C) by extracting O2 with the O2 permselective membrane from the reaction products and shifting the reaction equilibrium. To realize the concept, SO3 decomposition catalysts operating at moderated temperatures and O2 permselective membranes were developed. In addition to the catalytic activity, tolerance to the high-temperature corrosive environment, which severely damages most conventional catalytic materials within a short time, is an essential factor. In order to satisfy these conditions, the catalysts have been developed with active components such as platinum (Pt), vanadium (V), and support materials such as titanium dioxide (TiO2), silicon dioxide (SiO2), which have excellent acid resistance. Silica and bis(triethoxysilyl)ethane (BTESE)-derived organosilica membranes formed on a porous α-Al2O3 support has been developed as the O2 permselective membrane showing O2/SO3 selectivity of 10–20 with thermal and chemical stability. In addition, a membrane reactor for SO3 decomposition assisted with the O2 permselective membrane was confirmed to increase SO3 conversion.
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Tsuru, T., Machida, M. (2023). Oxygen Production by Sulfuric Acid Decomposition Assisted with Membrane. In: Aika, Ki., Kobayashi, H. (eds) CO2 Free Ammonia as an Energy Carrier. Springer, Singapore. https://doi.org/10.1007/978-981-19-4767-4_13
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DOI: https://doi.org/10.1007/978-981-19-4767-4_13
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