Effect of metal–support interaction in Ni/SiO2 catalysts on the growth of carbon nanotubes by methane decomposition

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon letters / 33권 / 2호
ㆍ저자명 : Jeong Bin Choi, Ji Sun Im, Seok Chang Kang, Young‑Seak Lee, Chul‑Wee Lee

목차

Abstract
1 Introduction
2 Experimental section
2.1 Catalyst preparation
2.2 Catalyst characterization
2.3 Catalyst evaluation
3 Results and discussion
3.1 Methane decomposition behavior
3.2 Properties of CNTs and used catalysts
3.3 Catalyst morphology
3.4 Metal–support interaction
3.5 Relationship between methane decomposition behavior and metal–support interaction
4 Conclusions
Acknowledgements
References

영어 초록

To investigate the effect of the catalyst and metal–support interaction on the methane decomposition behavior and physical properties of the produced carbon, catalytic decomposition of methane (CDM) was studied using Ni/SiO2 catalysts with different metal–support interactions (synthesized based on the presence or absence of urea). During catalyst synthesis, the addition of urea led to uniform and stable precipitation of the Ni metal precursor on the SiO2 support to produce Ni-phyllosilicates that enhanced the metal–support interaction. The resulting catalyst upon reduction showed the formation of uniform Ni0 particles (< 10 nm) that were smaller than those of a catalyst prepared using a conventional impregnation method (~ 80 nm). The growth mechanisms of methane-decomposition-derived carbon nanotubes was base growth or tip growth according to the metal–support interaction of the catalysts synthesized with and without urea, respectively. As a result, the catalyst with Ni-phyllosilicates resulting from the addition of urea induced highly dispersed and strongly interacting Ni0 active sites and produced carbon nanotubes with a small and uniform diameter via the base-growth mechanism. Considering the results, such a Ni-phyllosilicate-based catalyst are expected to be suitable for industrial base grown carbon nanotube production and application since as-synthesized carbon nanotubes can be easily harvested and the catalyst can be regenerated without being consumed during carbon nanotube extraction process.

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