ESR studies of oxygen, sulfur oxide, and sulfur radicals adsorbed on NaX zeolite.
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概要
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The states of O<SUB>2</SUB> and SO<SUB>2</SUB> adsorbed on NaX zeolite were investigated by means of ESR. No oxygen anion radicals were formed thermally on NaX up to 773 K. The adsorption of O<SUB>2</SUB> on γ-irradiated NaX in a vacuum, however, resulted in an ESR spectrum due to O<SUB>2</SUB><SUP>−</SUP>. Several kinds of O<SUB>2</SUB><SUP>−</SUP> species and O<SUB>3</SUB><SUP>−</SUP> were found to be formed on NaX by γ-irradiation in the presence of O<SUB>2</SUB>. These oxygen anion radicals showed different reactivities with N<SUB>2</SUB>O, ethylene and propylene, and transferred electrons to SO<SUB>2</SUB> to form SO<SUB>2</SUB><SUP>−</SUP>. The SO<SUB>2</SUB><SUP>−</SUP> radical was also produced on NaX by raising the temperature from 298 to 573 K after the introduction of SO<SUB>2</SUB>. This reacted with O<SUB>2</SUB> to form a radical, like SO<SUB>4</SUB><SUP>−</SUP>, but upon evacuating the O<SUB>2</SUB>, the reaction was reversed to give the original SO<SUB>2</SUB><SUP>−</SUP>. When the temperature of NaX was further raised to 773 K in the presence of SO<SUB>2</SUB>, a spectrum assigned to a polyatomic sulfur radical appeared indicating that SO<SUB>2</SUB> decomposition occurred at high temperature. This polymer radical was stable in an O<SUB>2</SUB> atmosphere at room temperature.
- 公益社団法人 日本化学会の論文
著者
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Yasumori Iwao
Department Of Applied Chemistry Faculty Of Engineering Kanagawa University
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Kanzaki Natsuko
Department of Chemistry, Tokyo Institute of Technology
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