Production of Carbon Nanotubes and Hydrogen Catalyzed with Ni/MCM-41 Catalysts
- 1 The American School Foundation, México City, Mexico
- 2 Dirección de Investigación y Posgrado, Instituto Mexicano del Petróleo, México City, México
Abstract
Methane catalytic decomposition (MCD) over Ni/MCM-41 catalysts was tested in a microreactor to simultaneously produce hydrogen and carbon nanotubes (CNTs). The methane conversion reached 30% to 47% at a moderate temperature range from 400°C to 600°C and the catalytic activity of the catalysts remains stable during 500 min steam on time. CNTs were chiefly formed through tip-growth mode, due to the weak interaction between the metallic Ni and the support. Most of the Ni particles are located on the tip of the produced CNTs, which avoids rapid deactivation of the catalyst resulted from carbon encapsulation. Large Ni particles usually lead to the formation of CNTs with big diameter. During the reaction, the shape of Ni particles changed from pseudo-sphere to diamond-like. All the CNTs consist of multiple layer walls and are curved in certain degree.
- L. Barretoa, A. Makihira and K. Riahi, “The Hydrogen Economy in the 21st Century: A Sutainable Development Scenario,” International Journal of Hydrogen Energy, Vol. 28, No. 3, 2003, pp. 276-284.
- P. Tomczyk, “Fundamental Aspects of the Hydrogen Economy,” World Futures: The Journal of Global Education, Vol. 65, No. 5-6, 2009, pp. 427-435. doi:10.1080/02604020903021818
- J. D. Holladay, “An Overview of Hydrogen Production Technologies,” Catalysis Today, Vol. 139, No. 4, 2009, pp. 244-260. doi:10.1016/j.cattod.2008.08.039
- Y. Li, D. Li and D. Wang, “Methane Decomposition to COx-Free Hydrogen and Nano-Carbon Materials on Group 8-10 Base Metal Catalysts: A Review,” Catalysis Today, Vol. 162, No. 1, 2011, pp. 1-46. doi:10.1016/j.cattod.2010.12.042
- K. P. De Jong and J. W. Geus “Carbon Nanofibers: Catalysis Synthesis and Applications,” Catalysis Review: Science & Technology, Vol. 42, No. 2, 2000, pp. 481-510.
- P. J. F. Harris, “Carbon Nanotubes and Related Structures: New Materials for the Twenty-First Century,” Cambridge University Press, Cambridge, 2003.
- M. S. Rahammad, E. Croiset and R. R. Hudgins, “Catalytic Decomposition of Methane for Hydrogen Production,” Topics in Catalysis, Vol. 37, No. 2-4, 2006, pp. 137-145. doi:10.1007/s11244-006-0015-8
- M. A. Ermakova, D. Y. Ermakov, A. L. Chuvilin and G. G. Kuvshinov, “Decomposition of Methane over Iron Catalysts at the Range of Moderate Temperatures: The Influence of Structure of the Catalytic Systems and the Reaction Conditions on the Yield of Carbon and Morphology of Carbon Filaments,” Journal of Catalysis, Vol. 201, No. 2, 2001, pp. 183-197. doi:10.1006/jcat.2001.3243
- J. S. Beck, J. C. Vartuli, W. J. Roth, M. E. Leonowics, C. T. Kresge, K. D. Schmitt, C. T.-W. Chu, D. H. Olson, E. W. Sheppard, S. B. McCullen, J. B. Higgins and J. L. Schlenker, “A New Family of Mesopoous Molecular Sieves Prepared with Liquid Crystal Template,” Journal of the American Chemical Society, Vol. 114, No. 27, 1992, pp. 10834-10843. doi:10.1006/jcat.2001.3243
- A. Sayari, M. Jaroniec and T. J. Pinnavaia, “Studies in Surface Science and Catalysis. Vol. 129: Nanoporous Materials II,” Elsevier Science, Amsterdam, 2000.
- H. C. Liu, H. Wang, J. H. Shen, Y. Sun and Z. M. Liu, “Preparation, Characterization and Activities of Nano-Sized Ni/SBA-15 Catalyst for Producing COx-Free Hydrocarbon from Ammonia,” Applied Catalysis A: General, Vol. 337, No. 2, 2008, pp. 138-147.