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- W2000624922 abstract "Samples of calcium, strontium and barium carbonates differing widely in surface activity have been prepared by calcining the oxalates, formates and acetates in vacuo and in air at a series of temperatures between 300° and 600° or 650°. Decomposition of the organo-metallic salts results in several-fold increases in specific surface, especially in vacuo, as the newly-formed carbonates recrystallise to very small individual crystals having the normal lattice structure. The products of maximum activity are obtained at or near the temperature at which decomposition is practically completed within the fixed time (5h.). The activity of the carbonate obtained from each oxalate is usually much higher than that from the corresponding formate and acetate, which require preliminary reaction between separate anions before decomposition. The activated carbonates all sinter on further calcination, the calcium carbonate sintering more rapidly than the strontium carbonate and still more so than the barium carbonate. Hence, calcination at the higher temperatures ultimately produces barium carbonate of greater activity than strontium carbonate and calcium carbonate. The reactivities of the carbonates in the ketonisation of acetic acid vapours are compared and discussed in relation to the temperature conditions." @default.
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- W2000624922 date "2007-05-04" @default.
- W2000624922 modified "2023-09-25" @default.
- W2000624922 title "Reactivity of lime and related oxides. X. Production of activated alkaline earth carbonates" @default.
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- W2000624922 doi "https://doi.org/10.1002/jctb.5010130305" @default.
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