The Catalytic Activity of AgX-type Zeolite for the Isomerization of 1-Butene
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概要
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The catalytic activity of X-type zeolite exchanged by Ag<SUP>+</SUP> was studied for the isomerization of 1-butene. The activity gradually increased with the degree of exchange up to <I>ca.</I> 60%, whereafter it rose steeply. A good correlation was found between the activity and the number of acid sites of <I>H</I><SUB>0</SUB> less than 3.3. Both preferences, that for the formation of <I>cis</I>-2-butene from 1-butene and that for the geometrical isomerization rather than the double bond shift, indicated that the reaction proceeds <I>via</I> a carbonium-ion intermediate formed on an acidic site. In the region of exchange around 40%, however, the <I>cis/trans</I> ratio in the 2-butenes produced was less than unity and a change in the reaction mechanism was suggested. Treatment with H<SUB>2</SUB> enhanced the activity of exchanged zeolite by a factor of 10<SUP>2</SUP>–10<SUP>3</SUP> without any change in the character of the reaction. These results were attributed to the formation of proton-X-zeolite by the replacement of Ag<SUP>+</SUP> with a proton. This conclusion was confirmed by the analysis of deuterium exchange during the isomerization on D<SUB>2</SUB>-treated AgX.
- 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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Chen Ling
Department Of Cardiovascular Medicine 1 Graduate School Of Medical Science Kyushu University
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Sugihara Hiroshi
Department of Chemistry, Tokyo Institute of Technology
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