Pd(dppm)_2的合成表征及其催化性能研究  

Synthesis and Characterization of Pd(dppm)_2 and Its Catalytic Properties

作　　者：林永生[1] 庞照勇[1] 吴振奕[1] 杨森根[1] 傅锦坤[1] 詹梦雄[1] 

机构地区：[1]厦门大学化学系,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2004年第6期816-819,共4页Journal of Xiamen University：Natural Science

基　　金：福建省自然科学基金(F0210010);厦门大学校级自选课题基金资助

摘　　要：合成了以双齿膦dppm为配体的金属配合物Pd(dppm)2,通过元素分析、红外光谱、热分析、光电子能谱、多晶粉末衍射等技术对该配合物的结构进行表征;用该配合物制备负载型Pd催化剂,并对其催化性能进行了研究,表明该催化剂对CO催化氧化成CO2的反应具有较好的催化效果.The title complex,Pd(dppm)_2 was prepared by treatment of a solution of PdCl_2 with bis(diphenylphosphino)methane (dppm) and NH_2NH_2·H_2O in nitrogen atmosphere,with yield at 81.2 percent.As a new palladium complex with ligand of phosphine,Pd(dppm)_2 was characterized by elementary analysis,IR spectra,XPS spectra,X-ray powder analysis,as well as thermal analysis.A plane square structure of the complex was supposed.The IR and XPS measurements showed that the state of Pd in the complex of Pd(dppm)_2 was in between zero- and +2 state,and Ph-P-Pd-P-Ph hyperconjugation was found in the complex.Pd(dppm)_2/γ-Al_2O_3 catalyst was prepared by solvated metal atom impregnation (SMAI) method.The result of activity assay indicated that the catalyst of Pd(dppm)_2 supported onγ-Al_2O_3 with high dispersion showed high catalytic activity for the oxidation of carbonmonoxide,with CO conversion reaching 100% at 75℃ and GHSV=30 000 mL(STP)·h^(-1)·g^(-1),with good stability during 19 h of reaction operation.The Ph-P-Pd-P-Ph hyperconjugation enlarge the dislocalization scope of the electron cloud,which may be an important reason that Pd(dppm)_2/γ-Al_2O_3 catalyst exhibited higher activity for CO oxidation at low temperature than that of PdCl_2/γ-Al_2O_3 catalyst at the same experimental condition.

关 键 词：催化性能 金属配合物 表征 粉末衍射 光电子能谱 PD催化剂 元素分析 合成 负载型 多晶 

分 类 号：O643[理学—物理化学] TQ426[理学—化学]