期刊
ACS CATALYSIS
卷 2, 期 9, 页码 2029-2035出版社
AMER CHEMICAL SOC
DOI: 10.1021/cs300462r
关键词
carbon dioxide fixation; catalyst design; catalyst recycling; Schiff bases; aluminum
资金
- National Natural Science Foundation of China [50973026]
- NSFC-NRF cooperative program [51011140349]
- State Key Laboratory of Fine Chemicals [KF013]
- U.S. National Science Foundation [CHE 1057743]
- Robert A. Welch Foundation [A-0923]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1057743] Funding Source: National Science Foundation
Aluminum salen complexes bearing appended quaternary ammonium salt substituents have been synthesized and shown to be effective catalysts for the coupling of epoxides and carbon dioxide to generate cyclic carbonates. Al-27 NMR spectra have demonstrated that these exist as both five- and six- coordinate Al(III) species in dimethylsulfoxide (DMSO) solution, whereas only a five-coordinate Al(III) species was detected in the (salen)AlCl analogue in the presence of an external onium salt. The onium salt group tethered on the salen ligand was found to play an important role in enhancing the catalytic activity. The effects of reaction variables such as temperature, time, pressure, molar ratio of epoxide to catalyst on the catalytic performance were systematically investigated. These bifunctional catalysts were found to be highly stable to moisture and oxygen, resistant to impurities, and recyclable with only minor losses in catalytic activity.
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