The hydrogenation of toluidines catalyzed by silica-supported carboxymethyl cellulose platinum complex forms methylcyclohexlamines in high yields, such as m-toluidine to 3-methylcyclohexylamine, o-toluidine to 2-methy...The hydrogenation of toluidines catalyzed by silica-supported carboxymethyl cellulose platinum complex forms methylcyclohexlamines in high yields, such as m-toluidine to 3-methylcyclohexylamine, o-toluidine to 2-methylcyclohexylamine, and p-toluidine to 4-methylcyclohexylamine in 97%, 96.7% and 98.2% yields, respectively, at 30 ℃ and under atmospheric hydrogen pressure. The yields were remarkably affected by the Pt content in the complex, the kind of solvent and the reaction temperature. The catalyst was very stable and could be reused several times without remarkable change in the catalytic activity.展开更多
A silica-supported carboxymethylcellulose platinum complex (abbreviated as SiO_2-CMC-Pt) has been prepared and characterized by XPS. Its catalytic properties for hydro-genation of aromatic compounds were studied. The ...A silica-supported carboxymethylcellulose platinum complex (abbreviated as SiO_2-CMC-Pt) has been prepared and characterized by XPS. Its catalytic properties for hydro-genation of aromatic compounds were studied. The results showed that this catalystcould catalyze the hydrogenation of phenol, anisol, p-cresol, benzene and toluene to cyclo-hexanol, cyclohexyl methyl ether, p-methyl cyclohexanol, cyclohexane and methylcyclo-hexane, respectively in 100% yield at 30℃ and 1 atm. In the hydrogenation of phenol,COO/Pt ratio in SiO_2-CMC-Pt has much influence on the initial hydrogenation rate andthe selectivity for the intermediate product, cyclohexanone. The highest initial rate andthe highest yield of cyclohexanone both occur at COO/Pt ratio of 6. The complex is stableduring the reaction and can be used repeatedly.展开更多
INTENTION:The effect of different reaction conditions such as temperature,pH value,time,the concentration of Na+ ions and Pb2+ ions on the complexation capacity of carboxymethyl chitosan（CMCS） to Ca2+ions,were inves...INTENTION:The effect of different reaction conditions such as temperature,pH value,time,the concentration of Na+ ions and Pb2+ ions on the complexation capacity of carboxymethyl chitosan（CMCS） to Ca2+ions,were investigated.METHOD:In different reaction conditions,carboxymethyl chitosan reacted with saturated solution of calcirm chorde,produced carboxymethyl chitoxan calcium（CCC）.The Ca2+ions concentration of CCC was determined by atomic absorption spectrophotometer.RESULT:After 15 minutes,the complexation capacity of Ca2+ions to CMCS was to most in the room temperature at pH6.0.CONCLUSION:The complexation of Ca2+ions to CMCS has been influenced by the complexation capacity of CMCS to other cations in the reactions system.展开更多
文摘The hydrogenation of toluidines catalyzed by silica-supported carboxymethyl cellulose platinum complex forms methylcyclohexlamines in high yields, such as m-toluidine to 3-methylcyclohexylamine, o-toluidine to 2-methylcyclohexylamine, and p-toluidine to 4-methylcyclohexylamine in 97%, 96.7% and 98.2% yields, respectively, at 30 ℃ and under atmospheric hydrogen pressure. The yields were remarkably affected by the Pt content in the complex, the kind of solvent and the reaction temperature. The catalyst was very stable and could be reused several times without remarkable change in the catalytic activity.
文摘A silica-supported carboxymethylcellulose platinum complex (abbreviated as SiO_2-CMC-Pt) has been prepared and characterized by XPS. Its catalytic properties for hydro-genation of aromatic compounds were studied. The results showed that this catalystcould catalyze the hydrogenation of phenol, anisol, p-cresol, benzene and toluene to cyclo-hexanol, cyclohexyl methyl ether, p-methyl cyclohexanol, cyclohexane and methylcyclo-hexane, respectively in 100% yield at 30℃ and 1 atm. In the hydrogenation of phenol,COO/Pt ratio in SiO_2-CMC-Pt has much influence on the initial hydrogenation rate andthe selectivity for the intermediate product, cyclohexanone. The highest initial rate andthe highest yield of cyclohexanone both occur at COO/Pt ratio of 6. The complex is stableduring the reaction and can be used repeatedly.
文摘INTENTION:The effect of different reaction conditions such as temperature,pH value,time,the concentration of Na+ ions and Pb2+ ions on the complexation capacity of carboxymethyl chitosan（CMCS） to Ca2+ions,were investigated.METHOD:In different reaction conditions,carboxymethyl chitosan reacted with saturated solution of calcirm chorde,produced carboxymethyl chitoxan calcium（CCC）.The Ca2+ions concentration of CCC was determined by atomic absorption spectrophotometer.RESULT:After 15 minutes,the complexation capacity of Ca2+ions to CMCS was to most in the room temperature at pH6.0.CONCLUSION:The complexation of Ca2+ions to CMCS has been influenced by the complexation capacity of CMCS to other cations in the reactions system.
