Tetranuclear Rh-Co bimetallic cluster was synthesized and characterized by IR and XPS. The properties of the anchored catalysts, its stability and the ligand effect were also studied. The experimental results show tha...Tetranuclear Rh-Co bimetallic cluster was synthesized and characterized by IR and XPS. The properties of the anchored catalysts, its stability and the ligand effect were also studied. The experimental results show that the optimal conditions for the hydroformylation of hexene-1 are as follows: the temperature is 80℃, reaction time 8 h, pressure 5. 88×105 Pa, and molar ratio of H2/CO 1. 2/1. 0. Functional groups attached to the donor atom(N) possess more or less some influence on the catalytic behavior. Compared with the homogeneous cluster, the polymer-supported bimetallic cluster is more stable. After the catalytic reaction, the structure of the anchored catalysts was not destroyed. X-ray photoelectron spectroscopy characterization indicates that there is a weak interaction between the polymer support and the active metals.展开更多
A silica-supported poly-γ- aminopropylsiloxane-rhodium-cobalt bimetallic complex(abbreviated as SiO_2-NH_2-Rh-Co)has been prepared and used as catalyst for hydroformylationof methyl methacrylate. The results showed t...A silica-supported poly-γ- aminopropylsiloxane-rhodium-cobalt bimetallic complex(abbreviated as SiO_2-NH_2-Rh-Co)has been prepared and used as catalyst for hydroformylationof methyl methacrylate. The results showed that the catalyst could catalyze the reaction in95.6% conversion with 92.8% selectivity for the normal aldehyde, methyl β-formylisobu-tyrate. Such catalyst also showed high stability during the reaction and could be used repeat-edly.展开更多
The hydrosilylation of alkenes with triethoxysilane has been achieved at 120 C in the presence of 0.01 mol%of thioetherfunctionalized MCM-41 anchored rhodium complex,affording the corresponding addition products in 68...The hydrosilylation of alkenes with triethoxysilane has been achieved at 120 C in the presence of 0.01 mol%of thioetherfunctionalized MCM-41 anchored rhodium complex,affording the corresponding addition products in 68-91%yields.This supported rhodium complex can be reused several times without noticeable loss of activity.Our system not only solves the basic problems of catalyst separation and recovery,but also avoids the use of phosphine ligands.展开更多
Siliceous mesostructured cellular foams （MCFs） are a new class of three-dimensional hydrothermally robust materials with ultralarge mesopores. The open system of large pores and the controllable pore size give MCFs ...Siliceous mesostructured cellular foams （MCFs） are a new class of three-dimensional hydrothermally robust materials with ultralarge mesopores. The open system of large pores and the controllable pore size give MCFs unique advantages as catalyst supports. In this paper, MCFs were employed as supports in developing the PPh3-Rh/MCF catalyst for propylene hydroformylation in a fixed-bed reactor. The PPh3-Rh/MCF catalyst shows high activity （propylene conversion of 21.6% and butyraldehyde TOF of 160.6 h -1）, high selectivity （n-butyraldehyde/i-butyraldehyde=10.4）, and excellent stability under mild conditions of p=1.0 MPa, T=393 K, and SV= 2?000 h -1.展开更多
基金The project supported by National Natural Science Foundation of China
文摘Tetranuclear Rh-Co bimetallic cluster was synthesized and characterized by IR and XPS. The properties of the anchored catalysts, its stability and the ligand effect were also studied. The experimental results show that the optimal conditions for the hydroformylation of hexene-1 are as follows: the temperature is 80℃, reaction time 8 h, pressure 5. 88×105 Pa, and molar ratio of H2/CO 1. 2/1. 0. Functional groups attached to the donor atom(N) possess more or less some influence on the catalytic behavior. Compared with the homogeneous cluster, the polymer-supported bimetallic cluster is more stable. After the catalytic reaction, the structure of the anchored catalysts was not destroyed. X-ray photoelectron spectroscopy characterization indicates that there is a weak interaction between the polymer support and the active metals.
文摘A silica-supported poly-γ- aminopropylsiloxane-rhodium-cobalt bimetallic complex(abbreviated as SiO_2-NH_2-Rh-Co)has been prepared and used as catalyst for hydroformylationof methyl methacrylate. The results showed that the catalyst could catalyze the reaction in95.6% conversion with 92.8% selectivity for the normal aldehyde, methyl β-formylisobu-tyrate. Such catalyst also showed high stability during the reaction and could be used repeat-edly.
基金National Natural Science Foundation of China(No.20862008)Natural Science Foundation of Jiangxi Province(No.2008GQH0034) for financial support
文摘The hydrosilylation of alkenes with triethoxysilane has been achieved at 120 C in the presence of 0.01 mol%of thioetherfunctionalized MCM-41 anchored rhodium complex,affording the corresponding addition products in 68-91%yields.This supported rhodium complex can be reused several times without noticeable loss of activity.Our system not only solves the basic problems of catalyst separation and recovery,but also avoids the use of phosphine ligands.
文摘Siliceous mesostructured cellular foams （MCFs） are a new class of three-dimensional hydrothermally robust materials with ultralarge mesopores. The open system of large pores and the controllable pore size give MCFs unique advantages as catalyst supports. In this paper, MCFs were employed as supports in developing the PPh3-Rh/MCF catalyst for propylene hydroformylation in a fixed-bed reactor. The PPh3-Rh/MCF catalyst shows high activity （propylene conversion of 21.6% and butyraldehyde TOF of 160.6 h -1）, high selectivity （n-butyraldehyde/i-butyraldehyde=10.4）, and excellent stability under mild conditions of p=1.0 MPa, T=393 K, and SV= 2?000 h -1.
