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ISSN 1003-9953
能源化学(英文) 2017, Vol. 26 Issue (1) :155-162    DOI: 10.1016/j.jechem.2016.10.002
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Reaction of nitrous oxide with methane to synthesis gas: A thermodynamic and catalytic study
Naseer A. Khana,b, Eric M. Kennedya, Bogdan Z. Dlugogorskic, Adesoji A. Adesinad, Michael Stockenhubera
a Priority Research Centre for Energy(PRCfE), The University of Newcastle, Callaghan, NSW 2308, Australia;
b Department of Chemical Engineering, UET, Peshawar, KPK, Pakistan;
c School of Engineering and Information Technology, Murdoch University, Murdoch, WA 6150, Australia;
d ATODATECH LLC, Brentwood, CA 94513, USA
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摘要 The aim of the present study is to explore the coherence of thermodynamic equilibrium predictions with the actual catalytic reaction of CH4 with N2O, particularly at higher CH4 conversions. For this purpose, key process variables, such as temperature (300℃-550℃) and a molar feed ratio (N2O/CH4=1, 3, and 5), were altered to establish the conditions for maximized H2 yield. The experimental study was conducted over the Co-ZSM-5 catalyst in a fixed bed tubular reactor and then compared with the thermodynamic equilibrium compositions, where the equilibrium composition was calculated via total Gibbs free energy minimization method.
The results suggest that molar feed ratio plays an important role in the overall reaction products distribution. Generally for N2O conversions, and irrespective of N2O/CH4 feed ratio, the thermodynamic predictions coincide with experimental data obtained at approximately 475℃-550℃, indicating that the reactions are kinetically limited at lower range of temperatures. For example, theoretical calculations show that the H2 yield is zero in presence of excess N2O (N2O/CH4=5). However over a Co-ZSM-5 catalyst, and with a same molar feed ratio (N2O/CH4) of 5, the H2 yield is initially 10% at 425℃, while above 450℃ it drops to zero. Furthermore, H2 yield steadily increases with temperature and with the level of CH4 conversion for reactions limited by N2O concentration in a reactant feed. The maximum attainable (from thermodynamic calculations and at a feed ratio of N2O/CH4=3) H2 yield at 550℃ is 38%, whereas at same temperature and over Co-ZSM-5, the experimentally observed yield is about 19%.
Carbon deposition on Co-ZSM-5 at lower temperatures and CH4 conversion (less than 50%) was also observed. At higher temperatures and levels of CH4 conversion (above 90%), the deposited carbon is suggested to react with N2O to form CO2.
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关键词Gibbs free energy minimization   N2O   CH4   Synthesis gas     
收稿日期: 2016-08-08; 发布日期: 2016-10-20
通讯作者 Michael Stockenhuber     Email: michael.stockenhuber@newcastle.edu.au
.Reaction of nitrous oxide with methane to synthesis gas: A thermodynamic and catalytic study[J]  能源化学(英文) , 2017,V26(1): 155-162
.Reaction of nitrous oxide with methane to synthesis gas: A thermodynamic and catalytic study[J]  Journal of Energy Chemistry, 2017,V26(1): 155-162
http://www.jenergchem.org/CN/10.1016/j.jechem.2016.10.002     或     http://www.jenergchem.org/CN/Y2017/V26/I1/155
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