摘要
采用离子交换冷冻法制得１１钨锌合铝杂多酸Ｈ７［Ａｌ（Ｈ２Ｏ）ＺｎＷ１１Ｏ３９］·１２Ｈ２Ｏ。确定了反应的ｐＨ值和物料的最佳比。用元素分析、电位滴定、红外光谱、紫外光谱、Ｘ射线粉末衍射和热分析等对合成产物进行了表征。电位滴定表明其７个质子是两步离解的。红外光谱给出了４个特征峰，紫外光谱给出了两个强的荷移跃迁谱带。根据Ｘ射线粉末衍射实验结果，确认１１钨锌合铝杂多酸具有Ｋｅｇｇｉｎ结构。在此基础上，对其在合成己二酸二（２乙基己）酯（ＤＯＡ）中的催化性能进行了研究，其选择性为９９．９％，产率为９３．９％。
The undecatungstozincoaluminic heteropoly acid H7[Al(H2O)ZnW11O39]·12H2O has been prepared by the ion exchangingcooling method. The optimal proportion of the materials and the pH of the synthesis reaction were given. The product was characterized by elemental analysis, potentiometric titration, IR, UV, Xray powder diffraction and thermal analysis. The potentiometric titration showed that seven protons are dissociated twostep. Four characteristic absorption peaks in IR spectrum and two intense chargetransfer bands in UV spectrum were given. According to Xray powder diffraction determination, it was confirmed that undecatungstozincoaluminic heteropoly acid possess the Keggin structure. The catalytic performance of the heteropoly acid for etherification of 2ethylhexyl alcohol with adipic acid was investigated. The selectivity and yield were 99.9% and 93.9%, respectively.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
1998年第2期327-330,共4页
The Chinese Journal of Nonferrous Metals
基金
辽宁省科委基金
关键词
钨锌合铝酸
杂多酸
催化剂
杂多化合物
undecatungstozincoaluminic acid heteropoly acid catalyst
