论文部分内容阅读
合成了二氧化硅负载的聚-γ-氨两基硅氧烷(简称:SiO_2>Si-NH_2)的单金属及双金属络合物(分别简称:SiO_2>Si-NH_2-M,M=C_O或 Cu;SiO>Si-NH_2-Cu-M′,M′=Co,Sn,Mn,Ni或Fe),考察了这些高分子金属络合物对苯胺氧化乙氧羰基化生成苯基氯甲酸乙酯反应的催化作用。结果表明,铜一钻双金属络合物(SiO_2>Si-NH_2-Cu-Co)的催化活性和选择性高于其他几种金属络合物,在温和的反应条件下可使苯胺以90％以上的转化率和大于80％的选择性转化成苯基氨甲酸乙酯。考察了各种反应条件对SiO_2>Si-NH_2-Cu-Co催化性能的影响,用测定转化数的方法研究了其稳定性。 SiO_2>Si-NH_2-Cu,SiO_2>Si-NH_2-Co和SiO_2>Si-NH_2-Cu-Co的XPS及IR研究结果表明,在高分子金属络合物中,氮与金属之间形成了配位键,每种金属都存在一种以上的结构形态。双金属络合物中两种金属存在相互作用。
A series of monometallic and bimetallic complexes (abbreviated as SiO_2> Si-NH_2-M, M = C_O, respectively) of silica-supported poly-γ- Or Cu; SiO> Si-NH2-Cu-M ’, M’ = Co, Sn, Mn, Ni or Fe) were investigated for the oxidative carbonylation of aniline to phenyl chlorocarbonate B Ester reaction catalysis. The results show that the catalytic activity and selectivity of copper-diamond bimetallic complexes (SiO_2> Si-NH_2-Cu-Co) are higher than those of other metal complexes. Under mild reaction conditions, The above conversions and selectivity over 80% are converted to phenyl phenyl urethane. The effects of various reaction conditions on the catalytic performance of SiO_2> Si-NH_2-Cu-Co were investigated. The stability was studied by measuring the conversion number. The results of XPS and IR of SiO_2> Si-NH_2-Cu, SiO_2> Si-NH_2-Co and SiO_2> Si-NH_2-Cu-Co show that in the polymer metal complexes, Bit-keys, each of which has more than one structure. There are interactions between the two metals in bimetallic complexes.