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• W2023808987 abstract "Studies of fly-ash composition identified the presence of calcium and sulphur, indicating their potential role as sources of calcium sulphate. Residual acidity (particularly for oil fly ash) suggested the possibility of enhanced chemical reaction, and the presence of transition metals, probably as oxides, might accelerate the oxidation of SO2 to SO42−. Exposure tests in a laboratory-based rig simulating dry deposition on Portland and Monks Park limestone, either seeded or unseeded with fly-ash particulate material or transition metal oxide catalysts, were carried out using an SO2-containing environment at 95% r.h. Enhanced sulphation of these seeded limestones due to the above factors was minimal; at high loadings of fly ash, there was even evidence of masking the limestone surface, reducing sulphation. However, pure CaCO3 powder in the exposure rig showed increases in sulphation when seeded with metal oxide catalysts. Thus the limestones examined contained sufficient inherent catalysts for the oxidation of SO2 to SO42− to proceed at such a rate that external catalysts were superfluous. This implies that dissolution rate of SO2 in moisture films controls the availability of species for reaction with these carbonate-based stones and that fly ash deposited from the atmosphere does not enhance the reaction." @default.
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• W2023808987 date "1992-10-01" @default.
• W2023808987 modified "2023-09-30" @default.
• W2023808987 title "The role of fly-ash particulate material and oxide catalysts in stone degradation" @default.
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• W2023808987 doi "https://doi.org/10.1016/0960-1686(92)90017-f" @default.
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