摘要
1.前言 在所有众多结构的杂多化合物中,至今为止,具有Keggin结构的杂多酸(盐)是研究得最充分、也是唯一商品化了的杂多化合物。近年来,有许多关于Keggin结构杂多化合物作为催化剂的研究结果和应用报道。这些催化反应许多是在液相中进行的。由于杂多化合物易受酸碱影响而使结构改变或破坏,因此,反应体系中的酸碱度对杂多化合物结构的稳定性和催化活性都有明显作用。所以,研究酸碱对杂多化合物结构和催化性能的影响具有重要意义。本文考察了12-钨磷酸(盐)在苄醇氧化反应中的催化活性以及酸碱对催化活性的影响。
The optimal reaction conditions for the oxidation of benzyl alcohol catalyzed by 12-tungstophos-phoric acid and CTMAB have been determined through the study of the catalytic activity of six het-eropoly acids with Keggin structure. The effect of different phase transfer catalysts (PTC) and the influence of reaction conditions have also been studied. The optimal reaction conditions are found to be as follows: catalyst. PW12, catalyst concentration: 10. 0 mM, PTC. CTMAB, the ratio of [CTMAB]/[Cat. ] = 3. 0, temperature:90℃ . Based on the best conditions, the catalytic activity of Na3-nHn PW12O40(n=0,1 ,2) has been studied, the effects of acidity and basicity on the reaction rate have also been investigated. The results showed the catalytic activity changes with the acidity and basicity in the shape of two humps.
出处
《分子催化》
EI
CAS
CSCD
1992年第1期62-66,共5页
Journal of Molecular Catalysis(China)
关键词
杂多酸
催化活性
苄醇
氧化
Heteropoly compounds, 12-Tungstophosphoric acid, Catatytic activity, Oxidation, Benzyl alcohol
