High Selectivity of Supported Ru Catalysts in the Selective CO Methanation-Water Makes the Difference
High Selectivity of Supported Ru Catalysts in the Selective CO Methanation-Water Makes the Difference
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DOI：
10.1021/jacs.5b03689
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发表时间：
2015-07-15
影响因子：
15
通讯作者：
Behm, R. Juergen
中科院分区：
文献类型：
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作者：
Abdel-Mageed, Ali M.;Eckle, Stephan;Behm, R. Juergen
烃类重整生成的富co2氢-2燃料气体中CO甲烷化反应的选择性是甲烷化反应实际应用的决定性因素。我们发现，与在（几乎）干气中操作相比，将原料气中的含水量增加到技术相关水平的30%，可显著提高负载型Ru催化剂的选择性，而在操作中，EXAFS测量显示，随着原料气中含水量的增加，Ru粒度逐渐减小。概述了这些发现和相关的红外光谱数据对机理理解和实际应用的影响。
The selectivity for CO methanation is a decisive aspect for the practical application of the methanation reaction for the removal of CO from CO2-rich H-2 fuel gases produced via hydrocarbon reforming. We show that increasing the water content in the feed gas, up to technically relevant levels of 30%, significantly increases the selectivity of supported Ru catalysts compared with operation in (almost) dry gas, while in operando EXAFS measurements reveal a gradual decrease in the Ru particle size with increasing amounts of water in the gas feed. Consequences of these findings and related IR spectroscopic data for the mechanistic understanding and practical applications are outlined.