铜铁二元类水滑石化合物的制备及催化性质研究

Preparation and Catalytic Application of Copper-containing Hydrotalcite-like Compounds

利用共沉淀法合成了CuFe二元类水滑石化合物。测定了不同Cu/Fe比混合盐溶液随沉淀剂NaOH与Na2CO3加入,混合盐体系pH值变化情况,详细探讨了不同因素对类水滑石化合物制备的影响,得到了合成铜铁二元类水滑石化合物的适宜条件,制备出晶相单一、结晶度高的类水滑石化合物,并利用XRD、FTIR、TG-DTA对合成物进行表征。将合成的催化剂引入苯甲醛与正丙醇反应生成安息香异丙醚反应中,苯甲醛转化率为58%,安息香异丙醚选择性接近于100%。

CuFe-Hydrotalcite-like Compounds（CuFe-HTLcs）were synthesized by coprecipitation with Cu（NO3）2·6H2O,Fe（NO3）3·9H2O,NaOH and Na2CO3 solution.The titration curves for different Cu/Fe ratios of mixed salt solution were discussed;the effects of some main factors on preparation of CuFe-HTLcs were studied such as pH values,different ratios of Cu/Fe of mixed solution,temperature and time of hydrothermal treatment.The characterization of samples was carried out by XRD,TG-DTA and FTIR.The synthesis of benzoin isopropyl ether with benzaldehyde and propanol was performed to evaluate their catalytic activities of the material obtained in this work.CuFe-HTLcs（Cu/Fe=2）presented an excellent activity in the synthesis of benzoin isopropyl ether.The highest conversion of benzaldehyde could reach 58%,while the selectivity of benzoin isopropyl ether was nearly 100%.