Article

Catalytic decomposition of methane over activated carbon

State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165,Taiyuan, Shanxi 030001, PR China; Graduate School of Chinese Academy of Sciences, Beijing 100039, China
Journal of Analytical and Applied Pyrolysis DOI:10.1016/j.jaap.2005.03.004 pp.335-341

ABSTRACT Methane decomposition over activated carbons was carried out in a fixed bed, quartz-tube flow reactor. The kinetics of methane decomposition and surface properties changes before and after reaction was investigated. As a non-carbon based material, active alumina was also used to compare and understand the catalytic decomposition mechanism of methane over different materials. A reaction order of 0.5 is obtained for methane decomposition over ACs and activation energies in the range from 117 to 185 kJ mol−1. The pore size change in the course of methane decomposition over activated carbons indicates that the catalytic reaction occurs mainly in the micropores. Activated alumina has different pore properties and carbon deposition in mesopores of the alumina is responsible for the catalytic activity.

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    Article: Methane decomposition over Ni loaded activated carbon for hydrogen production and the formation of filamentous carbon
    Zongqing Bai, Haokan Chen, Baoqing Li, Wen Li
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    ABSTRACT: Methane decomposition over Ni loaded activated carbon (AC) was investigated in a fixed-bed reactor, and the results were compared with those of the individual methane decomposition over AC. XRD results show that there is no NiO observed, and only Ni metal crystallite is found in the catalyst even if it is calcined in Ar, which eliminates the inevitable reduction step with other supports. When Ni is loaded on AC, the Ni/AC catalyst shows higher activity in methane decomposition than the original carbon. Ni crystal size increasing and the new crystallite Ni3C formation during the process lead to the deactivation of the catalysts. Filamentous carbon formation is observed and interlaced with the deactivated catalyst surface at moderate condition with low amount of Ni loaded. Temperature has great effect on the catalytic performance of Ni/AC catalyst and the formation as well as the characterization of the filamentous carbons.
    International Journal of Hydrogen Energy.
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Keywords

Activated alumina
 
activated carbons
 
active alumina
 
alumina
 
carbon deposition
 
catalytic activity
 
catalytic decomposition mechanism
 
catalytic reaction
 
different materials
 
fixed bed
 
Methane decomposition
 
micropores
 
non-carbon
 
pore size change
 
quartz-tube flow reactor
 
reaction order