Acetone hydrogenation over co-precipitated Ni/Al₂O₃, Co/Al₂O₃ and Fe/Al₂O₃ catalysts

Abstract

Co-precipitated Ni/Al₂O₃, Co/Al₂O₃ and Fe/Al₂O₃ catalysts containing 10–50 wt.% of metal are prepared and characterized by BET surface area, pore volume and XRD. Hydrogen chemisorption and oxygen uptake measurements are used to estimate the extent of reduction and the available surface metal sites. Acetone hydrogenation under vapour phase conditions is carried out over the catalysts in the temperature region 373–523 K. Conversion and selectivity of the catalysts are compared and are correlated with their hydrogen and oxygen uptake characteristics. Nickel catalysts are very active followed by cobalt and iron. A dual function mechanism involving both metal and acidic properties decide the selectivity of the products. The selectivity for propan-2-ol depends only on the metal availability whereas the selectivity for isobutyl methyl ketone depends on both acidic and metallic character of the catalyst. A mechanism explaining the different products formed is postulated.

References

1. L. M. Gandia and M. Montes, Int. J. Energy Res., 1992, 16, 851.
2. L. M. Gandia and M. Montes, Appl. Catal. A, 1993, 101, L1.
3. Y. Q. Zhengyiwang and Ren Wang, Appl. Catal. A, 1989, 53, 63.
4. L. M. Gandia, A. Diaz and M. Montes, J. Catal., 1995, 157, 157.
5. L. M. Gandia and M. Montes, J. Mol. Catal., 1994, 94, 347.
6. B. Sen and M. A. Vannice, J. Catal., 1988, 113, 52.
7. M. Nakamura and H. Wise, Proc. 6th Int. Congr. Catal. London, 1976, ed. G. C. Bond, P. B. Wells and F. C. Tompkins, The Chemical Society, London, 1977, p. 881.
8. F. Rositani, S. Galvagno, Z. Poltarzews, P. Staiti and P. L. Antonucci, J. Chem. Technol. Biotechnol., 1985, 35A, 234.
9. J. Simonikova, A. Ralkova and K. Kochloefl, J. Catal., 1973, 29, 412.
10. J. Simonikova, L. Hillaire, J. Panck and K. Kochloefl, J. Phys. Chem., 1973, 83, 287.
11. A. Farkas and L. Farkas, J. Am. Chem. Soc., 1939, 61, 1336.
12. C. T. H. Stoddart and C. Kemball, J. Colloid Sci., 1956, 11, 532.
13. S. Narayanan, R. Unnikrishnan and V. Vishwanathan, Appl. Catal. A, 1995, 129, 9.
14. R. Unnikrishnan, V. Vishwanathan and S. Narayanan, Catalysis: Modern Trends, ed. N. M. Gupta and D. K. Chakrabarty, Narosa, New Delhi, 1996, p. 333.
15. S. Narayanan and R. Unnikrishnan, J. Chem. Soc., Faraday Trans., 1997, 93, 2009.
16. S. Narayanan and R. Unnikrishnan, Appl. Catal. A, 1996, 145, 231.
17. S. Narayanan and K. Uma, J. Chem. Soc., Faraday Trans. 1, 1985, 81, 2733.
18. S. Narayanan and K. Uma, J. Chem. Soc., Faraday Trans. 1, 1987, 83, 733.
19. S. Narayanan and K. Uma, J. Chem. Soc., Faraday Trans. 1, 1988, 84, 521.
20. S. Narayanan and G. Sreekanth, J. Chem. Soc., Faraday Trans. 1, 1989, 85, 3785.
21. V. Vishwanathan, M. Rajashekar, G. Sreekanth and S. Narayanan, J. Chem. Soc., Faraday Trans. 1, 1991, 87, 3449.
22. C. H. Bartholomew and R. J. Farrauto, J. Catal., 1976, 45, 41.
23. J. M. Zowtiak, G. D. Weatherbee and C. H. Bartholomew, J. Catal., 1983, 82, 230.
24. G. D. Weatherbee, J. L. Rankin and C. H. Bartholomew, Appl. Catal. A, 1984, 11, 73.
25. R. L. Chin and D. M. Hercules, J. Phys. Chem., 1982, 86, 360.
26. H. Jung and W. J. Thomson, J. Catal., 1991, 128, 218.
27. S. Narayanan and K. Deshpande, Appl. Catal. A, 1996, 135, 125.
28. J. Zielinski, J. Catal., 1982, 76, 157.
29. P. Arnoldy and J. A. Moulijn, J. Catal., 1985, 93, 38.
30. A. J. H. M. Kock, H. M. Fortuin and J. W. Geus, J. Catal., 1985, 96, 261.
31. A. Sannomiya, K. Ichimura, M. Yano and Y. Harano, Memoirs of the Faculty of Engineering, Osaka City Univ., 1983, 24, 161.
32. P. H. M. de Korte, E. B. M. Doesburg, C. P. J. de Winter and L. L. van Reijen, Solid State Ionics, 1985, 16, 73.
33. G. I. Golodets, N. V. Pavlenko, A. I. Tripolskii and G. M. Telbiz, Kinet. Katal., 1985, 26, 557.