Kinetics of methane decomposition to COx-free hydrogen and carbon nanofiber over Ni-Cu/MgO catalyst

被引：61
作者：
Borghei, Maryam [1 ]
Karimzadeh, Ramin [1 ]
Rashidi, Alimorad [2 ]
Izadi, Nosrat [2 ]
机构：
[1] Tarbiat Modares Univ, Dept Chem Engn, Tehran, Iran
[2] Res Inst Petr Ind, Res Ctr Nanotechnol, Tehran, Iran
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2010年 / 35卷 / 17期
关键词：
Kinetic modeling; Methane decomposition; CO-free hydrogen; Carbon nanofibers; NICKEL; DECARBONIZATION; CHEMISORPTION; NANOCARBON; NANOTUBES; NI(100);
D O I：
10.1016/j.ijhydene.2010.05.072
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Kinetic modeling of methane decomposition to CON-free hydrogen and carbon nanofiber has been carried out in the temperature range 550-650 degrees C over Ni-Cu/MgO catalyst from CH4-H-2 mixtures at atmospheric pressure. Assuming the different mechanisms of the reaction, several kinetic models were derived based on Langmuir-Hinshelwood type. The optimum value of kinetic parameters has been obtained by Genetic Algorithm and statistical analysis has been used for the model discrimination. The suggested kinetic model relates to the mechanism when the dissociative adsorption of methane molecule is the rate-determining stage and the estimated activation energy is 50.4 kJ/mol in agreement with the literature. The catalyst deactivation was found to be dependent on the time, reaction temperature, and partial pressures of methane and hydrogen. Inspection of the behavior of the catalyst activity in relation to time, led to a model of second order for catalyst deactivation. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：9479 / 9488
页数：10
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