Preparation of Novel Membrane Material 4’,4’’(5’’)-di-tert-butyldicyclohexyl-18-crown-6

Alsamani A.M. Salih; Ying Ming Li; Juan Fan; Chun Hai Yi; Bo Lun Yang

doi:10.4028/www.scientific.net/AMR.960-961.73

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Preparation of Novel Membrane Material 4’,4’’(5’’)-di-tert-butyldicyclohexyl-18-crown-6

Abstract:

For preparing 4’,4’’(5’’) di-tert-butyl-dicyclohexyl-18-crown-6 with high yield under low H₂ pressure, the support, active component, promoter, reduction time and reduction temperature were studied. The catalyst structure and composition were characterized by XRD, TEM and EDS. The experimental results showed that MgO was the most suitable catalyst support because of its weaker acidity than other supports. The higher hydrogenation activity and selectivity were observed when Rh was used as the active component and Fe was used as promoter owing to the cooperative interaction. The optimum reduction temperature and the reduction time were 500 oC and 3h, respectively. The specific surface area of Rh-Fe/MgO was 133m²/g, and the Rh-Fe was well dispersed on MgO with the particle size about 20 nm. Under a low H₂ pressure (4 MPa), the 4’,4’’(5’’) di-tert-butyldibenzo 18-crown-6 conversion was 78% and 4’,4’’(5’’) di-tert-butyl-dicyclohexyl-18-crown-6 yield was 53% catalyzed by Rh-Fe/MgO, which were higher than that catalyzed by single metal catalyst.