| 12-钨磷酸及其盐的酸性与催化性能的研究 |
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| 引用本文： | 蔡天锡,石仁敏,陈萍,王大庆,李吕辉.12-钨磷酸及其盐的酸性与催化性能的研究[J].高等学校化学学报,1986,7(6):522. |
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| 作者姓名： | 蔡天锡 石仁敏 陈萍 王大庆 李吕辉 |
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| 作者单位： | 大连工学院化工系 |
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| 摘 要： | 红外法研究结果表明12-钨磷酸Fe3+、Mg2+和Na+盐都具有L酸点和B酸点。用Benesi法测得10种12-钨磷酸盐的酸强度顺序为(Al3+、Fe3+、La3+、Cu2+、Cd2+>Zn2+>(Ca2+、Mg2+>(Na+、Li+,其酸量与抗衡阳离子的离子势和电负性大体成线性关系。还看出酸量与所含结晶水量有关。催化剂的酸量与其对异丙醇脱水反应和丁烯-1异构化反应的催化活性的关系表现出不同的特征,这可用“体相型”和“表面型”催化作用的不同特点来解释。
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| 收稿时间： | 1985-01-15 |
Investigation on the Acidity and Catalytic Activity of H3PW12/sub> O40 and Its Salts |
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| Cai Tianxi,Sh Renmin,Chen Ping,Wang Daqing,Li Luhui.Investigation on the Acidity and Catalytic Activity of H3PW12/sub> O40 and Its Salts[J].Chemical Research In Chinese Universities,1986,7(6):522. |
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| Authors: | Cai Tianxi Sh Renmin Chen Ping Wang Daqing Li Luhui |
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| Affiliation: | Chemical Engineering Department, Dalian Institute of Technology, Dalian |
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| Abstract: | IRstudy showed that the Fe3+, Mg3+ and Na+ salts of H3PW12O40 have both Lewis acid and Bronsted acid sites. The relative acid strength of salts of H3PW12O40 determined by Benesi’s method is roughly as follows.(Al3+, Fe3+ , La3+, Cu3+ , Cd3+)>Zn2+>(Ca2+, Mg2+ )(Na2+, Li2+)The total acidity of H0≤+ 6.8 related approximately linearly with ionic potential and the electronegativity of the countercations. The acid quantity varied with the calcination temperatnre, showing maximum at 200-250℃.The somewhat different form of the graphs of catalytic activity versus acidity of catalysts on dehydration of isopropanol and isomerization of butene-1 might be due to that the former reaction occured in the bulk of the catalysts. |
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