Characterisation of SiO₂-supported nickel catalysts for carbon dioxide reforming of methane

Abstract

The CO₂–methane reformation reaction over Ni/SiO₂ catalysts has been extensively studied using a range of temperature-programmed techniques and characterisation of the catalysts by thermogravimetry (TG), X-ray diffraction (XRD) and electron microscopy (TEM). The results indicate a strong correlation between the microstructure of the catalyst and its performance. The role of both CO₂ and CH₄ in the reaction has been investigated and the role of methyl radicals in the reaction mechanism highlighted. A reaction mechanism involving dissociatively adsorbed CO₂ and methyl radicals has been proposed.

References

1. S. S. Bharadwaj and L. D. Schmidt, Fuel Process. Technol., 1995, 42, 109.
2. G. Ghiotti and F. Boccuzzi, Catal. Rev.-Sci. Eng., 1987, 29, 151.
3. I. Wender, Fuel Process. Technol., 1996, 48, 189.
4. R. Levitan, H. Rosin and M. Levy, Solar Energy, 1989, 42, 267.
5. P. D. F. Vernon, M. L. H. Green, A. K. Cheetham and A. T. Ashcroft, Nature (London), 1991, 352, 225.
6. E. Ruckenstein and Y. Hu, J. Catal., 1996, 162, 230.
7. J. C. S. Wong and J. T. Yates Jnr., J. Phys. Chem., 1995, 99, 12 640.
8. J. L. Falconer and A. E. Zagli, J. Catal., 1980, 62, 280.
9. S. Ho and T. Chou, Ind. Eng. Chem. Res., 1995, 34, 2279.
10. H. J. Freund and M. W. Roberts, Surf. Sci. Rep., 1996, 25, 225.
11. Z. Zhang and X. E. Verykois, Catal. Lett., 1996, 38, 175.
12. V. C. H. Kroll, H. M. Swaan and C. Mirodatos, J. Catal., 1996, 161, 409.
13. M. A. Goula, A. A. Lemonidou and A. M. Efstathiou, J. Catal., 1996, 161, 626.
14. J. R. Rostrup-Nielsen, J. Catal., 1972, 27, 343.