Porous Structure Formed by the Decomposition of the Surface Product on ZnO Preserved in the Atmosphere
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概要
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The slow reaction of ZnO with CO<SUB>2</SUB> and water in the atmosphere is investigated by following the changes in both the surface area of the structure formed and the amounts of CO<SUB>2</SUB> and water evolved, by heating the product <I>in vacuo</I> at increasingly elevated temperatures. The results obtained show that ZnO reacts extremely gradually with CO<SUB>2</SUB> and water cooperatively in the atmosphere to produce an amorphous surface product with a composition approximate to Zn<SUB>5</SUB>(OH)<SUB>6</SUB>(CO<SUB>3</SUB>)<SUB>2</SUB>, and that this product is decomposed by heating <I>in vacuo</I> to release the CO<SUB>2</SUB> and water, leaving a porous structure on the ZnO. The surface area of the product was found to change upon heating: first it increases, passes a prominent maximum value at 200 °C, recovers the original value at 500 °C, and further decreases at higher temperatures; this reflects the initial growth and subsequent destruction of the porous structure. Furthermore, it was confirmed that the destruction of such a honeycomb-like structure is promoted by the adsorption of water.
- 公益社団法人 日本化学会の論文
著者
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MORIMOTO Tetsuo
Department of Bio-mechanical Systems, Faculty of Agriculture, Ehime University
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Morishige Kunimitsu
Department of Chemistry, Faculty of Science, Okayama University
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Nagao Mahiko
Department of Chemistry, Faculty of Science, Okayama University
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Takeshita Toshie
Department of Chemistry, Faculty of Science, Okayama University
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Morishige Kunimitsu
Department of Chemistry, Faculty of Science, Hokkaido University
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