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Catalytica
 
Volume 1 - Issue 1 : Year 2019

Research Paper .

Selective hydrogenation of 1-heptyne on nickel based catalysts

M. G. Prakash (a, b), R. Mahalakshmy (b), K. R. Krishnamurthy (a) , and B. Viswanathan (a, *)

(a) National Centre for Catalysis Research, Indian Institute of Technology, Madras, Chennai - 600036, India.
(b) Department of Chemistry, Thiagarajar College, Madurai Kamaraj University, Madurai -625009, India.

Catalytica 1/1 (2019) 1 - 6.

© Applied Science Innovations Private Limited, India.

Full Text (OPEN ACCESS) : Catalytica-1-1-1-2019-1-6.pdf

Published On : 10-08-2019 18:54:37

Abstract:

Titania (P-25) supported mono metallic Ni and bimetallic Ni-Cu, Ni-Ag and Ni-Au catalysts were prepared and characterized by Temperature Programmed Reduction, H2 Temperature Programmed Desorption, X-ray diffraction, Transmission Electron Microscopy, Diffuse Reflectance Spectroscopy and X-ray Photoelectron Spectroscopy techniques. Selective hydrogenation of 1-heptyne (2 % w/w in toluene) to 1-heptene was carried out on all the four catalysts, at atmospheric pressure and in the temperature range 313 – 353 K. Nickel based bimetallic catalysts display higher activity for 1-heptyne conversion and selectivity to 1-heptene, compared to monometallic Ni catalyst. Availability of reactive hydrogen, as revealed by H2-TPD studies on bimetallic catalysts, is responsible for higher activity. In the case of bimetallic catalysts, XPS data reveal electronic interactions between Ni and promoter elements (Cu, Ag and Au), which increase the electron density around Ni. Such an increase in electron density around Ni facilitates desorption of olefinic species like 1-heptene. Hence higher selectivity towards 1-heptene is observed with bimetallic catalysts.


Keywords: Selective hydrogenation, 1-heptyne, nickel based bimetallic catalysts, charge transfer to Ni, N-H bond strength