Direct observation of carbon nanotube formation in Pd/H-ZSM-5 and MoO3/H-ZSM-5 based methane activation catalysts
The nature of carbonaceous species deposited upon MoO3/H-ZSM-5 and Pd/H-ZSM-5 based catalysts during methane activation at 700 °C has been studied. TEM evidences the formation of open-ended multi-walled carbon nanotubes on MoO3/H-ZSM-5 based dehydroaromatisation catalysts. Pd/H-ZSM-5 is more active, exclusively towards methane cracking and post-reaction analysis reveals the distribution of different carbonaceous species is more homogeneous which TEM demonstrates to be in the form of closed-end multi-walled carbon nanotubes.
Keywordscarbon nanotubes methane dehydroaromatisation zeolite TEM TGA
JSJH and SB acknowledge the EPSRC and University of Glasgow for the provision of a DTA studentship to SB. The kind assistance of Mrs. Kim Wilson in performing CHN analyses is gratefully acknowledged.
- 8.S. Liu, Q. Dong, R. Ohnishi and M. Ichikawa, Chem. Commun. (1997) 1455Google Scholar
- 22.S.T. Oyama and G.L. Haller, Catalysis, Spec. Per. Rep., Vol. 5 (RSC, Cambridge, 1982) 333Google Scholar
- 23.T.V. Choudhary and D.W. Goodman, Catalysis, Vol. 19 (RSC, Cambridge, 2006) 164Google Scholar
- 24.Zhao Y., Pan Y.-X., Cui L., Liu C.-J. (2007) Diamond Rel. Mater. 16:279Google Scholar