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采用水热-尿素水解法制备了系列含Cu2+的类水滑石化合物Cu x Mg3-x Al1-LDHs,并考察了这些催化剂对苯酚和碘苯合成二苯醚反应的催化性能.利用X射线粉末衍射(XRD)、差热热重(TG-DTA)、H2程序升温还原(H2-TPR)和扫描电镜(SEM)等方法对催化剂进行了表征.结果表明,Cu2+含量较低时,类水滑石催化剂具有较好的结晶度和热稳定性,随Cu2+含量的增加,层板间距加大,热稳定性也随之降低.催化活性测试结果表明,适量Cu2+的掺入可使催化剂的催化活性提高,其中催化剂Cu2Mg1Al1-LDHs具有较好的催化活性,在80℃条件下二苯醚收率达到55%.
A series of Cu x Mg3-x Al1-LDHs containing hydrotalcite-like hydrotalcites were prepared by hydrothermal-urea hydrolysis method, and the catalytic performance of these catalysts for the synthesis of diphenylether from phenol and iodobenzene was investigated.X-ray powder diffraction The catalysts were characterized by XRD, TG-DTA, H2-temperature-programmed reduction (H-TPR) and scanning electron microscopy (SEM). The results show that when the content of Cu2 + is low, the hydrotalcite- Has better crystallinity and thermal stability, with the increase of Cu2 + content, the interlayer spacing increases, thermal stability also decreases.Catalytic activity test results show that the appropriate amount of Cu2 + incorporation can increase the catalytic activity of the catalyst, The catalyst Cu2Mg1Al1-LDHs has good catalytic activity, and the yield of diphenyl ether reached 55% at 80 ℃.