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以Keggin型杂多酸盐 (Na5PW11Z(H2 O)O3 9,Z =Mn ,Fe ,Co,Ni,Cu ,Zn ,以下简称为PW11Z)为催化剂 ,过氧化氢为氧化剂 ,在水—正己醇两相体系中进行了正己醇到正己醛的选择氧化反应 .在此选择氧化反应中同时伴随着过氧化氢分解的竞争反应 ,两种反应间存在着明显的对应关系 .在 70℃时 ,生成正己醛的催化剂活性序列为PW11Co>PW11Fe≈PW11Ni≈PW11Mn >PW11Cu≈PW11Zn ,其中PW11Co的正己醛收率为 3.3% ,当把过氧化氢稀释 ,向反应体系中滴入时 ,则正己醛的收率将大幅度提高 .对于PW11Co来说 ,正己醛的收率提高为 7.12 % ,选择性为 89.4% .还利用ICP ,IR ,UV等手段对催化剂进行了表征
Hydrogen peroxide is used as oxidant in Keggin type heteropoly acid salt (Na5PW11Z (H2O) O3 9, Z = Mn, Fe, Co, Ni, Cu, Zn, In the system, selective oxidation of n-hexanol to n-hexanal was carried out. There was a clear correspondence between the two reactions in the selective oxidation reaction accompanied by the competitive reaction of hydrogen peroxide decomposition. At 70 ℃, The activity sequence of aldehydes was PW11Co> PW11Fe≈PW11Ni≈PW11Mn> PW11Cu≈PW11Zn, and the yield of n-hexanal in PW11Co was 3.3%. When the hydrogen peroxide was diluted and dropped into the reaction system, the yield of n-hexanal The yield of n-hexanal increased by 7.12% and the selectivity was 89.4% for PW11Co.The catalysts were also characterized by means of ICP, IR and UV