Preparation of Heteropoly Molybdoselenite Complex and Its Lanthanide Salts and Their Catalysis for Hydroxylation of Phenol  

作　　者：Zhang Pingyu Wang Wei Wu Jigui 

机构地区：[1]National Laboratory of Western China＇s Environmental Systems, Lanzhou University, Lanzhou 730000, China [2]College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China

出　　处：《Journal of Rare Earths》2006年第2期I0002-I0002,共1页稀土学报（英文版）

摘　　要：A heteropoly molybdoselenite complex （NH4）6[ Se2Mo8O31 ]·5H2O and its lanthanide salts Ln2 [Se2Mo8O31]-XH2O（Ln = La^3＋, Ce^3＋, Nd^3＋ Sm^3＋） were synthesized and characterized with elemental analysis, IR, UV, XRD and TG-DTA. Their reactivity for hydroxylation of phenol was investigated. The results show that catalytic activity of （ NH4 ）6 [Se2Mo8O31 ]·5H2O is higher than that of its lanthanide salts. The reaction temperatures, the reaction time. the catalvst amount, the ratio of phenol and H2O2 have influence on the phenol conversation, H2O2 selectivity and product distribution. The optimum reaction condition was obtained with orthogonal method. At optimum reaction condition which the ratio of phenol and H2O2 = 1 ： 1, reaction time is 4 h, reaction temperatures is 70℃ and catalyst is 10 g·mol^-1, and the conversation of phenol reaches as high as 29.65 %, the product selectivity can reach 77.2 % for catalyst （NH4）6[ Se2Mo8O31 ]·5H2O.A heteropoly molybdoselenite complex （NH4）6[ Se2Mo8O31 ]·5H2O and its lanthanide salts Ln2 [Se2Mo8O31]-XH2O（Ln = La^3＋, Ce^3＋, Nd^3＋ Sm^3＋） were synthesized and characterized with elemental analysis, IR, UV, XRD and TG-DTA. Their reactivity for hydroxylation of phenol was investigated. The results show that catalytic activity of （ NH4 ）6 [Se2Mo8O31 ]·5H2O is higher than that of its lanthanide salts. The reaction temperatures, the reaction time. the catalvst amount, the ratio of phenol and H2O2 have influence on the phenol conversation, H2O2 selectivity and product distribution. The optimum reaction condition was obtained with orthogonal method. At optimum reaction condition which the ratio of phenol and H2O2 = 1 ： 1, reaction time is 4 h, reaction temperatures is 70℃ and catalyst is 10 g·mol^-1, and the conversation of phenol reaches as high as 29.65 %, the product selectivity can reach 77.2 % for catalyst （NH4）6[ Se2Mo8O31 ]·5H2O.

关 键 词：molydoselenite complexes lanthanide salts synthesis H2O2 HYDROXYLATION rare earths 

分 类 号：O614.33[理学—无机化学]