Citation:
Yuan You-Zhu, Zhang Yu, Chen Zhong, Zhang Hong-Bin, Cai Qi-Rui. Structure and Hydroformylation Performance of Supported Aqueous-phase Rh Catalyst[J]. Acta Physico-Chimica Sinica,
;1998, 14(11): 1013-1019.
doi:
10.3866/PKU.WHXB19981110
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The catalytic activity of hydroformylation of 1-hexene over SiO2-supported TPPTSRh(acac)(CO)2 (SAPC) was found to be evidently promoted when a proper amount of water-vapor was introduced into the reactant. Characterization results by using MAS NMR 31p spectra revealed that there were three types of phosphine species in the as-prepared SAPC: uncoordinated ligand TPPTS (over 70 mol%), surface complex {Rh(CO)(TPPTS)2} (chemical shift at δ=32.4, about 15 mol%), and unknown (about 10 mol%). By pre-treatment at 373 K for 2 under dry-snygas or at 333 K for 2 h under wet-syngas, the amount of phosphine species of the surface complex{Rh(CO)(TPPTS)2} was slightly increased to 20-30mol%, accompanying a few changes in ratios of the other phsophine species. When the SAPC was pre-treated at 373 K for 2 h under wet-syngas, however, the phosphine species at chemical shift of 32.4 was increased by over 40 mol% due to the in-situ formation of the surface complex {Rh(CO)(TPPTS)2}. It was found that the peak at δ=32.4 was also a principal one in the MAS NMR 31P spectra of the working SAPC, which demonstrated that the surface complex of {Rh(CO)(TPPTS)2 } would be a catalytic active species for olefin hydroformyaltion. After hydroformylation for 43 h, the deactivation of the catalyst occurred, corresponding to the observations of a broadness in peak ascribed to the surface complex of {An(CO)(TPPTS)z} in the MAS NMR 31P spectra, indicating that there existed de-coordination of the surface complex and oxidation of the ligand TPPTS during the reaction. The results suggest that a proper amount of water-vapor was able to accelerate the formation of active Rh-complex on the catalyst surface and thus increase the catalytic activity, whereas, it could be inevitably to cause the de-coordination of the surface complex and the oxidation of phosphine ligand under the reaction condition, hence leading to the deactivation of the catalyst.
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