12-钨磷酸及其盐的酸性与催化性能的研究

高等学校化学学报 ›› 1986, Vol. 7 ›› Issue (6): 522.

12-钨磷酸及其盐的酸性与催化性能的研究

蔡天锡, 石仁敏, 陈萍, 王大庆, 李吕辉

大连工学院化工系

收稿日期:1985-01-15 出版日期:1986-06-24 发布日期:1986-06-24
基金资助:
中国科学院科学基金

Investigation on the Acidity and Catalytic Activity of H₃PW_{12/sub> O₄₀ and Its Salts}

Cai Tianxi, Sh Renmin, Chen Ping, Wang Daqing, Li Luhui

Chemical Engineering Department, Dalian Institute of Technology, Dalian

Received:1985-01-15 Online:1986-06-24 Published:1986-06-24

摘要/Abstract

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。

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.

TrendMD:

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. 高等学校化学学报, 1986, 7(6): 522.

Cai Tianxi, Sh Renmin, Chen Ping, Wang Daqing, Li Luhui . Investigation on the Acidity and Catalytic Activity of H₃PW_{12/sub> O₄₀ and Its Salts}. Chem. J. Chinese Universities, 1986, 7(6): 522.