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ylww1988

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[资源] 甲烷化 反应 热力学分析

最近出的,
Synthetic natural gas (SNG) can be obtained via methanation of synthesis gas (syngas). Many thermodynamic reaction details involved in this process are not yet fully understood. In this paper, a comprehensive thermodynamic analysis of reactions occurring in the methanation of carbon oxides (CO and CO2) is conducted using the Gibbs free energy minimization method. The equilibrium
constants of eight reactions involved in the methanation reactions were calculated at different temperatures. The effects of temperature, pressure, ratio of H2/CO (and H2/CO2), and the addition of other compounds (H2O, O2, CH4, and C2H4) in the feed gas (syngas) on the conversion of CO and CO2, CH4 selectivity and yield, as well as carbon deposition, were carefully investigated. In addition,
experimental data obtained on commercial Ni-based catalysts for CO methanation and three cases adopted from the literature were compared with the thermodynamic calculations. It is found that low temperature, high pressure, and a large H2/CO (and H2/CO2) ratio are favourable for the methanation reactions. Adding steam into the feed gas could alleviate the carbon deposition to a large
extent. Trace amounts of O2 in syngas is unfavourable for SNG generation although it can lower carbon deposition. Additional CH4 in the feed gas almost has no influence on the CO conversion and CH4 yield, but it leads to the increase of carbon formed. Introduction of a small amount of C2H4, a representative of hydrocarbons in syngas, results in low CH4 yield and serious carbon deposition
although it does not affect CO conversion. CO is relatively easy to hydrogenated compared to CO2 at the same reaction conditions. The comparison of thermodynamic calculations with experimental results demonstrated that the Gibbs free energy minimization method is significantly effective for understanding the reactions occurring in methanation and helpful for the development of catalysts
and processes for the production of SNG.
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ylww1988

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自己顶一下看看,都没有人做甲烷化吗?
5楼2012-02-26 09:35:52
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kingxin1986

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这位兄弟用过无梯度反应器做甲烷化动力学吗?想像你请教一些这方面的问题
8楼2012-03-07 21:20:14
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ylww1988

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引用回帖:
8楼: Originally posted by kingxin1986 at 2012-03-07 21:20:14:
这位兄弟用过无梯度反应器做甲烷化动力学吗?想像你请教一些这方面的问题

没有,我只做催化剂
9楼2012-03-08 11:15:59
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apollosun9283

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★★★★★ 五星级,优秀推荐

图一和75年那本书上的一样。
21楼2012-07-19 20:28:41
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hrbj999

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很好的文章!请问楼主,还有其他相关的英文文章吗?你们做的催化剂是什么类型的啊?还望楼主不吝赐教,
31楼2013-01-31 18:03:04
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ylww1988

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引用回帖:
31楼: Originally posted by hrbj999 at 2013-01-31 18:03:04
很好的文章!请问楼主,还有其他相关的英文文章吗?你们做的催化剂是什么类型的啊?还望楼主不吝赐教,

可参考:
1.        Hu, D.C., et al., Enhanced Investigation of CO Methanation over Ni/Al2O3 Catalysts for Synthetic Natural Gas Production. Industrial & Engineering Chemistry Research, 2012. 51(13): p. 4875-4886.

2.        Gao, J.J., et al., Nickel Catalysts Supported on Barium Hexaaluminate for Enhanced CO Methanation. Industrial & Engineering Chemistry Research, 2012. 51(31): p. 10345-10353.

3.        Jia, C., et al., Nickel catalysts supported on calcium titanate for enhanced CO methanation. Catalysis Science & Technology, 2013. 3(2): p. 490-499.
32楼2013-01-31 18:32:20
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