摘要
应 用 原 位 红 外 光 谱 技 术, 研 究 了 Rh ( acac) ( C O) ( P Ph3) 、 H Rh ( C O) ( P Ph3) 3 、 Rh 6 ( C O) 16 和( Rh( C H3 C O O) 2)24 种催化剂,在 C O/ H2 气氛中催化1辛烯氢甲酰化 反应时 Rh 催化剂的活 化过程。结果表明,在以 O P Ph3 为配体的情况下,催化剂的中间体均为 Wilkinson 型配合物 H Rh( C O)x( O P Ph3) y( x + y = 3 或4) ,此外,同时还存在有二聚体、多羰基铑配合物等。当4 种催化剂在无配体的情况下,醛化反应的活性仍然较高,此时观察到在使用( Rh( C H3 C O O) 2) 2 及 Rh 6( C O)16 时, 最终生 成 H Rh( C O)4 的活性中 间体。当使 用 R H(acac) ( C O) ( P Ph3) 及 H Rh( C O)( P Ph3) 3 时,活性中间体仍然以 H Rh( C O)x( P Ph3) y 型配合物为主,同时可能存在少量的 H Rh( C O) 4 中间物。
Under the reaction conditions ( V (CO): V (H 2)=1:1,2 0MPa),the hydroformylation of 1 octene with four rhodium complex catalysts(Rh(acac)(CO)(PPh 3),HRh(CO)(PPh 3) 3,Rh 6(CO) 16 and [Rh(CH 3COO) 2] 2) is studied using in situ IR spectroscopy. The intermediate complex is HRh(CO) x(OPPh 3) y (x+y=3 or 4) as Wilkinson proposed when ligand OPPh 3 is added to the catalytic system, and dimers and multi-carbonyl rhodium complex are also detected. The hydroformylation reaction activity is also very high when no ligands coexist in four rhodium complex catalysts. When [Rh(CH 3COO) 2] 2 and Rh 6(CO) 16 are used as the catalyst precusors, the intermediate active species HRh(CO) 4 is observed. The main active complex HRh(CO) x(OPPh 3) y is detected when the other two catalysts are used, and HRh(CO) 4 is probably existed in the catalytic system, but the content is lower.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
1999年第4期8-13,共6页
Natural Gas Chemical Industry
关键词
铑羰基配合物
氢甲酰化
催化剂
壬醛
rhodium carbonyl complex
hydroformylation
homogeneous catalysis