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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
