新型层柱催化剂Zn2Al－XW11Z的催化氧化活性及热稳定性

STUDIES ON THE OXIDATIVE ACTIVITY AND THERMAL STABILITY OF A NEW TYPE PILLARED LAYERED CATALYST Zn 2Al XW 11 Z

新型层柱催化剂Ｚｎ２Ａｌ┐ＸＷ１１Ｚ的催化氧化活性及热稳定性＊贺庆林胡长文＊＊张云峰王恩波（东北师范大学化学系，长春１３００２４）关键词层柱催化剂，杂多阴离子，氧化活性，热稳定性，苯甲醛，氧化同多和杂多阴离子柱撑水滑石是近年来新开发的层柱状催化材料，...

Layered double hydrotalcites pillared by heteropoly oxometalates with Keggin structure, Zn 2Al XW 11 Z(X=Si(Ⅳ), Ge(Ⅳ) and B(Ⅲ); Z=Co(Ⅱ), Ni(Ⅱ) and Cu(Ⅱ)) and Zn 2Al XW 11 (X=Si(Ⅳ) and Ge(Ⅳ)), have been synthesized by anion exchange method. The catalysts were found to be catalytically efficient for the oxidation of benzaldehyde to benzoic acid using H 2O 2 as oxidant in liquid solid liquid triphase system. It was deduced that the reaction of benzaldehyde and H 2O 2 in the presence of the catalysts undergoes free radical reaction mechanism. Thermal stability of the catalysts was also studied by DTA, XRD and IR. The results showed that the thermal stability of all the Zn 2Al XW 11 Z is higher than their precursor Zn 2Al NO 3, the reason accounted for this phenomenon is suggested.