Nature of oxygen species incorporated into acrylaldehyde in vapor-phase oxidation of propylene over supported copper catalyst.
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概要
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The oxidation of propylene with Cu<SUB>2</SUB>O as active phase for acrylaldehyde formation gave no acrylaldehyde in contrast to the fully oxidized CuO–SiC. However, CuO–SiC from which adsorbed oxygen species was eliminated gave rise to the formation of a negligible amount of acrylaldehyde. The presence of molecular oxygen species adsorbed on the CuO–SiC was shown by the desorption of oxygen and the isotopic mixing reaction of <SUP>16</SUP>O–<SUP>18</SUP>O. The adsorbed oxygen (possibly molecular oxygen species) seems to be necessary as oxygen incorporated into acrylaldehyde. Agreement of the ratio of <SUP>18</SUP>O/<SUP>16</SUP>O in acrylaldehyde formed by the oxidation with oxygen containing <SUP>18</SUP>O over Cu<SUB>2</SUB><SUP>16</SUP>O with that of <SUP>18</SUP>O/<SUP>16</SUP>O in the reaction mixture supports the role of adsorbed oxygen species. The presence of O<SUB>2</SUB><SUP>−</SUP> over Cu<SUB>2</SUB>O during the course of oxidation was confirmed by the formation of furan and maleic anhydride in the co-oxidation with butadiene. The results were discussed in relation to the structure of the catalyst suitable for selective oxidation, the incorporation of oxygen atom <I>via</I> electronegative oxygen species adsorbed being proposed.
- 公益社団法人 日本化学会の論文
著者
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Akimoto Masamichi
Department Of Applied Chemistry And Biotechnology Faculty Of Engineering Niigata Institute Of Techno
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Echigoya Etsuro
Department of Chemical Engineering, Tokyo Institute of Technology
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Akiyama Masao
Department of Chemical Engineering, Tokyo Institute of Technology
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