Journal
RSC ADVANCES
Volume 10, Issue 64, Pages 38755-38766Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ra06003h
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Funding
- Department of Chemical Engineering, University of Cape Town, South Africa
- UGC, India
- UKM research grants [DIP-2019-001, GUP-2020-034]
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Direct catalytic coupling of nitrobenzene hydrogenation and cyclohexanol dehydrogenation was studied in the gas phase over mesoporous MgO-SBA15 supported Cu nanoparticles. This approach avoids an external supply of H-2 and utilizes the in situ liberated H-2 from the dehydrogenation step of the first reactant for the hydrogenation reaction of the second reactant. A catalyst series consisting of four Cu/MgO-SBA15 mesoporous solids with varying Cu loadings (5-20 wt%) were prepared and systematically characterized by BET, ICP, XRD, TPR, TPD, FT-IR, SEM, XPS, and TEM. Among the series, the 15 wt% Cu catalyst exhibited the best performance with >= 82% conversion of nitrobenzene along with >= 89% cyclohexanol conversion. In addition, significantly higher yields of cyclohexanone (83%) and aniline (75%) could be achieved successfully over the same catalyst. Furthermore, the catalyst exhibited almost stable activity during 30 h time-on-stream with slow deactivation. The highly ordered mesoporous silica increases the metal-support interaction with smaller particles of Cu on the surface, and the synergism between acid-base sites is responsible for the improved catalytic activity.
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