Aqueous phase semihydrogenation of alkynes over Ni-Fe bimetallic catalysts

Abstract
Bimetallic Ni-Fe catalysts (Ni/Fe, 1 : 1, 1 : 3, and 3 : 1) are synthesized and explored for their catalytic activity in semihydrogenation of internal alkynes using H2 gas in water-ethanol solution. Our findings revealed that over the Ni1Fe3 catalyst a high diastereoselectivity for Z-alkenes with a high conversion for a wide range of internal alkynes can be achieved at moderate reaction temperature (40 °C). Notably, the selectivity for the Z-alkenes is enhanced in the presence of n-butyl amine as an additive. Deuterium labeling experiments evidenced that H2 gas becomes dissociated homolytically over the catalyst surface to hydrogenate alkynes to alkenes. Synthesized catalysts were successfully characterized by HR-TEM, SEM, XPS, EDS, P-XRD and H2-TPD.

Citation
Rai, R. K., Awasthi, M. K., Singh, V. K., Barman, S. R., Behrens, S., & Singh, S. K. (2020). Aqueous phase semihydrogenation of alkynes over Ni–Fe bimetallic catalysts. Catalysis Science & Technology, 10(15), 4968–4980. doi:10.1039/d0cy01153c

Acknowledgements
This work is financially supported by the Science and Engineering Research Board, New Delhi (EMR/2016/005783) and Council of Scientific and Industrial Research, New Delhi (01(2885)/17/EMR-II) and the Indian Institute of Technology Indore, India. SIC, IIT Indore, UGC-DAE, Indore and IKFT-KIT are acknowledged for the instrumentation facilities. R.K.R. thanks IIT Indore for his research associateship. M.K.A. thanks INSPIRE for senior research fellowship. We would like to acknowledge Martin Hähsler for support with TEM analysis.

Publisher
Royal Society of Chemistry (RSC)

Journal
Catalysis Science & Technology

DOI
10.1039/d0cy01153c

Additional Links
http://xlink.rsc.org/?DOI=D0CY01153C

Permanent link to this record