화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.33, No.2, 490-499, February, 2016
DOI10.1007/s11814-015-0183-y  Export Citation
COx-free hydrogen and carbon nanofibers production by methane decomposition over nickel-alumina catalysts
Nima Bayat1, Mehran Rezaei1, 2, †, and Fereshteh Meshkani1
  • 1Catalyst and Advanced Materials Research Laboratory, Chemical Engineering Department, Faculty of Engineering, University of Kashan, Kashan, Iran
  • 2Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan, Iran
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Nickel catalysts supported on mesoporous nanocrystalline gamma alumina with various nickel loadings were prepared and employed for thermocatalytic decomposition of methane into COx-free hydrogen and carbon nanofibers. The prepared catalysts with different nickel contents exhibited mesoporous structure with high surface area in the range of 121.3 to 66.2m2g.1. Increasing in nickel content decreased the pore volume and increased the crystallite size. The catalytic results revealed that the nickel content and operating temperature both play important roles on the catalytic performance of the prepared catalysts. The results showed that increasing in reaction temperature increased the initial conversion of catalysts and significantly decreased the catalyst lifetime. Scanning electron microscopy (SEM) analysis of the spent catalysts evaluated at different temperatures revealed the formation of intertwined carbon filaments. The results showed that increasing in reaction temperature decreased the diameters of nanofibers and increased the formation of encapsulating carbon.
Keywords:Methane Decomposition;Hydrogen;COx-free;Carbon Nanofibers;Nickel;Alumina
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