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题名: Sorption-enhanced synthetic natural gas (SNG) production from syngas: A novel process combining CO methanation, water-gas shift, and CO2 capture
作者: Lebarbier, Vanessa M.1;  Dagle, Robert A.1;  Kovarik, Libor1;  Albrecht, Karl O.2;  Li, Xiaohong1;  Li, Liyu1;  Taylor, Charles E.3;  Bao, Xinhe4;  Wang, Yong1, 5
关键词: Methanation ;  CO2 sorption ;  Sorption enhanced reaction ;  Methanation catalyst ;  CO2 sorbent
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
发表日期: 2014
DOI: 10.1016/j.apcatb.2013.06.034
卷: 144, 页:223-232
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Environmental ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Synthetic natural gas (SNG) production from syngas is under investigation again due to the desire for less dependency from imports and the opportunity for increasing coal utilization and reducing greenhouse gas emission. CO methanation is highly exothermic and substantial heat is liberated which can lead to process thermal imbalance and deactivation of the catalyst. As a result, conversion per pass is limited and substantial syngas recycle is employed in conventional processes. Furthermore, the conversion of syngas to SNG is typically performed at moderate temperatures (275-325 degrees C) to ensure high CH4 yields since this reaction is thermodynamically limited. In this study, the effectiveness of a novel integrated process for the SNG production from syngas at high temperature (i.e. 600 degrees C) was investigated. This integrated process consists of combining a CO methanation nickel-based catalyst with a high temperature CO2 capture sorbent in a single reactor. Integration with CO2 separation eliminates the reverse-water-gas shift and the requirement for a separate water-gas shift (WGS) unit. Easing of thermodynamic constraint offers the opportunity of enhancing yield to CH4 at higher operating temperature (500-700 degrees C) which also favors methanation kinetics and improves the overall process efficiency due to exploitation of reaction heat at higher temperatures. Furthermore, simultaneous CO2 capture eliminates greenhouse gas emission. In this work, sorption-enhanced CO methanation was demonstrated using a mixture of a 68% CaO/32% MgAl2O4 sorbent and a CO methanation catalyst (Ni/Al2O3, Ni/MgAl2O4, or Ni/SiC) utilizing a syngas ratio (H-2/CO) of 1, gas-hour-space velocity (GHSV) of 22,000 h(-1), pressure of 1 bar and a temperature of 600 degrees C. These conditions resulted in similar to 90% yield to methane, which was maintained until the sorbent became saturated with CO2. By contrast, without the use of sorbent, equilibrium yield to methane is only 22%. Cyclic stability of the methanation catalyst and durability of the sorbent were also studied in the multiple carbonation-decarbonation cycle studies proving the potential of this integrated process in a practical application. (C) 2013 Elsevier B.V. All rights reserved.
关键词[WOS]: SUPPORTED NICKEL-CATALYSTS ;  PARTIAL OXIDATION ;  CARBON-MONOXIDE ;  CAO ;  CONVERSION ;  SORBENT ;  DIOXIDE ;  CYCLES ;  METAL ;  SIZE
语种: 英语
WOS记录号: WOS:000327686200028
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145467
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Pacific NW Natl Lab, Inst Integrated Catalysis, Richland, WA 99352 USA
2.Pacific NW Natl Lab, Chem & Biol Proc Dev Energy & Environm Directorat, Richland, WA 99352 USA
3.Natl Energy Technol Lab, Pittsburgh, PA 15236 USA
4.Chinese Acad Sci, Dalian Inst Chem Phys, Beijing 100864, Peoples R China
5.Washington State Univ, Voiland Sch Chem Engn & Bioengn, Pullman, WA 99164 USA

Recommended Citation:
Lebarbier, Vanessa M.,Dagle, Robert A.,Kovarik, Libor,et al. Sorption-enhanced synthetic natural gas (SNG) production from syngas: A novel process combining CO methanation, water-gas shift, and CO2 capture[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2014,144:223-232.
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