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W2078403129 abstract "The effect of autoclaving a zinc oxide preparation containing SO2−4 under 5 and 10 atmospheres is studied by combining X-ray diffraction, differential thermal analysis, thermogravimetry and IR spectroscopy. Textural measurements are also carried out on the parent samples and those produced in the temperature range 200–1000°C. A new phase of a basic carbonates̄ulphate, including ammonia in its coordination shell, is observed in the original preparation and having its d distances at 11.060, 8.954 and 2.714 Å. This is transformed to another phase at ∼180°C which is also the main phase characterizing the autoclaved samples, and belongs to a basic zinc oxide—sulphate possessing d distances at 7.055, 2.468 and 2.805 Å. Autoclaving the oxide preparation under 10 atm gives hexagonal zinc oxide of high purity and crystallinity at 1000°C. An empirical formula is given for the oxide preparation which describes the different decomposition stages observed. At ∼390°C, a reversible reduction process comprising oxygen evolution is observed. Autoclaving increases the area of the parent oxide and at temperatures below 600°C is a function of the structural changes. The autoclaving pressure is insignificant ⩾600°C. Pore structure analysis showed all the samples to be predominantly mesoporous, coexisting with some micropores except that autoclaved under 5 atm and heated at 250°C which is predominantly microporous. Autoclaving under 5 atm causes narrowing of the pores for products below 600°C. Autoclaving has little effect on the average pore radius ⩾600°C. Evaluation of the average pore radius from the constructed t-curves for parallel-plate pore idealization is discussed." @default.
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W2078403129 date "1982-10-01" @default.
W2078403129 modified "2023-09-27" @default.
W2078403129 title "Effect of autoclaving on zinc oxide in the presence of sulphate ions" @default.
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W2078403129 doi "https://doi.org/10.1016/0040-6031(82)87083-4" @default.
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