Role of the Feed Gas on the Selective Catalytic Dehydrogenation of Benzyl Alcohol over Cu/Hydrotalcite Catalyst

The present work highlights the utilization of CO2 as feed gas for the catalytic dehydrogenation of benzyl alcohol to benzaldehyde over supported Cu catalysts in continuous process. Powder X‐Ray Diffraction (XRD) patterns, N2O pulse chemisorption results, H2‐Temperature Programmed Reduction (H2‐TPR)...

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Bibliographic Details
Published in:ChemistrySelect (Weinheim) 2018-07, Vol.3 (28), p.8277-8284
Main Authors: Gurram, Venkata Ramesh Babu, Enumula, Siva Sankar, Kondeboina, Murali, Koppadi, Kumara Swamy, Burri, David Raju, Kamaraju, Seetha Rama Rao
Format: Article
Language:English
Subjects:
Benzaldehyde
Benzyl alcohol
Carbon dioxide
Cu/hydrotalcite
Dehydrogenation
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Summary:The present work highlights the utilization of CO2 as feed gas for the catalytic dehydrogenation of benzyl alcohol to benzaldehyde over supported Cu catalysts in continuous process. Powder X‐Ray Diffraction (XRD) patterns, N2O pulse chemisorption results, H2‐Temperature Programmed Reduction (H2‐TPR) profiles and Transmission Electron Microscopy (TEM) analysis suggests that Cu/hydrotalcite possess high dispersion with small Cu atoms. Due to the united effects of high metal dispersion and bifunctional acid base properties (as evidenced by Temperature Programmed Desorption (TPD) of CO2 and NH3), Cu/hydrotalcite catalyst offers better activity than Cu/Al2O3 and Cu/MgO. The presence of CO2 promotes reverse water gas shift reaction by consuming the in‐situ generated H2 in dehydrogenation process and maintains stable benzaldehyde selectivity. Whereas the presence of N2 promotes the disproportionation reaction and leads to decrease in benzaldehyde selectivity. CO2 and N2 are tested as feed gases for the titled reaction over Cu/HT, Cu/MgO and Cu/Al2O3 catalysts. The successive reactions, dehydrogenation followed by hydrogenolysis resulted in equal selectivity to aldehyde and toluene in N2 flow and reverse water gas shift reaction driven the reaction to good aldehyde selectivity in CO2 flow.
ISSN:2365-6549
2365-6549
DOI:10.1002/slct.201801341