稀土类水滑石的制备及其催化性能的研究

采用共沉淀水热合成锌铝类水滑石(Zn Al-HTLcs)和锌铝铈三元类水滑石(Zn Al Ce-HTLcs)。并利用XRD对不同条件下合成产物进行物相分析。实验结果表明,在M2+∶M3+=2,Ce3+∶Al3+=0.25,p H=5.8~6.5下,进行多种离子共沉淀,均能合成结构单一的Zn Al-HTLcs和Zn Al Ce-HTLcs。并以此为前驱体经一定温度焙烧后得到复合金属氧化物催化剂,研究了催化剂在乙酸戊醇酯化反应中的应用。当M2+∶M3+为2,Ce3+∶Al3+为0.25条件下,催化剂在实验条件下均具有较好的催化活性,其中经500℃下焙烧的催化剂,乙酸的转化率最高可达78.7%。

study on preparation of rare earth HtALs and catalytic activity

Zn-Al Hydrotalcite-like（ ZnAl-HTLcs）and Zn-Al-Ce hydrotalcite-like（ ZnAlCe-HTLcs）were synthesized by co-precipitation and hydrothermal synthesis methods,and measured by XRD. The results show that：under the M2＋：M3＋ =2,Ce3＋：Al3＋ =0. 25,pH = 5. 8 ~6. 5 ,a single synthetic ZnAl-HTLcs and ZnAlCe-HTLcs can be obtained. As a precursor after the calcination temperature by a certain complex metal oxide catalysts have been studied in the acetic acid catalyst for esterification of N-pentanol in the application of the detailed effects of catalyst composition and reaction conditions on catalytic activi-ty. When molar ratio of M2＋：M3＋ is 2 and molar ratio of Ce3＋：Al3＋ is 0. 25,catalyst at 500 ℃ calcina-tion have a better catalytic activity in acetic acid up to a maximum conversion rate of 78 . 7%.