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Sorption-enhanced synthetic natural gas (SNG) production from syngas: A novel process combining CO methanation, water-gas shift, and CO2 capture
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
2014
DOI10.1016/j.apcatb.2013.06.034
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
关键词[WOS]SUPPORTED NICKEL-CATALYSTS ; PARTIAL OXIDATION ; CARBON-MONOXIDE ; CAO ; CONVERSION ; SORBENT ; DIOXIDE ; CYCLES ; METAL ; SIZE
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.
语种英语
WOS记录号WOS:000327686200028
引用统计
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/145467
专题中国科学院大连化学物理研究所
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
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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.
APA Lebarbier, Vanessa M..,Dagle, Robert A..,Kovarik, Libor.,Albrecht, Karl O..,Li, Xiaohong.,...&Wang, Yong.(2014).Sorption-enhanced synthetic natural gas (SNG) production from syngas: A novel process combining CO methanation, water-gas shift, and CO2 capture.APPLIED CATALYSIS B-ENVIRONMENTAL,144,223-232.
MLA Lebarbier, Vanessa M.,et al."Sorption-enhanced synthetic natural gas (SNG) production from syngas: A novel process combining CO methanation, water-gas shift, and CO2 capture".APPLIED CATALYSIS B-ENVIRONMENTAL 144(2014):223-232.
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