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Performance characteristics of fluidized bed syngas methanation over Ni-Mg/Al2O3 catalyst
Alternative TitleChin. J. Chem. Eng.
Liu, Jiao1; Cui, Dianmiao1,2; Yu, Jian1; Su, Fabing1; Xu, Guangwen1
2015
Source PublicationCHINESE JOURNAL OF CHEMICAL ENGINEERING
ISSN1004-9541
Volume23Issue:1Pages:86-92
Abstract

The performance characteristics of isothermal fluidized bed syngas methanation for substitute natural gas are investigated over a self-made Ni-Mg/Al2O3 catalyst. Via atmospheric methanation in a laboratory fluidized bed reactor it was clarified that the CO conversion varied in 5% when changing the space velocity in 40-120 L.g(-1).h(-1) but the conversion increased obviously by raising the superficial gas velocity from 4 to 12.4 cm.s(-1). The temperature at 823 K is suitable for syngas methanation while obvious deposition of uneasy-oxidizing C. occurs on the catalyst at temperatures around 873 K. From a kinetic aspect, the lowest reaction temperature is suggested to be 750 K when the space velocity is 60 L.g(-1).h(-1). Raising the H-2/CO ratio of the syngas increased proportionally the CO conversion and CH4 selectivity, showing that at enough high H-2/CO ratios the active sites on the catalyst are sufficient for CO adsorption and in turn the reaction with H-2 for forming CH4. Introducing CO2 into the syngas feed suppresses the water gas shift and Boudouard reactions and thus increased H-2 consumption. The ratio of CO2/CO in syngas should be better below 0.52 because varying the ratio from 0.52 to 0.92 resulted in negligible increases in the H-2 conversion and CH4 selectivity but decreased the CH4 yield. Introducing steam into the feed gas affected little the CO conversion but decreased the selectivity to CH4. The tested Ni-Mg/Al2O3 catalyst manifested good stability in structure and activity even in syngas containing water vapor. (C) 2014 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.

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The performance characteristics of isothermal fluidized bed syngas methanation for substitute natural gas are investigated over a self-made Ni-Mg/Al2O3 catalyst. Via atmospheric methanation in a laboratory fluidized bed reactor it was clarified that the CO conversion varied in 5% when changing the space velocity in 40-120 L.g(-1).h(-1) but the conversion increased obviously by raising the superficial gas velocity from 4 to 12.4 cm.s(-1). The temperature at 823 K is suitable for syngas methanation while obvious deposition of uneasy-oxidizing C. occurs on the catalyst at temperatures around 873 K. From a kinetic aspect, the lowest reaction temperature is suggested to be 750 K when the space velocity is 60 L.g(-1).h(-1). Raising the H-2/CO ratio of the syngas increased proportionally the CO conversion and CH4 selectivity, showing that at enough high H-2/CO ratios the active sites on the catalyst are sufficient for CO adsorption and in turn the reaction with H-2 for forming CH4. Introducing CO2 into the syngas feed suppresses the water gas shift and Boudouard reactions and thus increased H-2 consumption. The ratio of CO2/CO in syngas should be better below 0.52 because varying the ratio from 0.52 to 0.92 resulted in negligible increases in the H-2 conversion and CH4 selectivity but decreased the CH4 yield. Introducing steam into the feed gas affected little the CO conversion but decreased the selectivity to CH4. The tested Ni-Mg/Al2O3 catalyst manifested good stability in structure and activity even in syngas containing water vapor. (C) 2014 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.

KeywordSyngas Methanation Ni Catalyst Fluidized Bed Substitute Natural Gas Performance
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.cjche.2014.09.038
URL查看原文
Indexed BySCI
Language英语
WOS KeywordSYNTHETIC NATURAL-GAS ; DIMETHYL ETHER ; CO METHANATION ; CARBON OXIDES ; REACTOR
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000349604400012
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/11790
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100864, Peoples R China
Recommended Citation
GB/T 7714
Liu, Jiao,Cui, Dianmiao,Yu, Jian,et al. Performance characteristics of fluidized bed syngas methanation over Ni-Mg/Al2O3 catalyst[J]. CHINESE JOURNAL OF CHEMICAL ENGINEERING,2015,23(1):86-92.
APA Liu, Jiao,Cui, Dianmiao,Yu, Jian,Su, Fabing,&Xu, Guangwen.(2015).Performance characteristics of fluidized bed syngas methanation over Ni-Mg/Al2O3 catalyst.CHINESE JOURNAL OF CHEMICAL ENGINEERING,23(1),86-92.
MLA Liu, Jiao,et al."Performance characteristics of fluidized bed syngas methanation over Ni-Mg/Al2O3 catalyst".CHINESE JOURNAL OF CHEMICAL ENGINEERING 23.1(2015):86-92.
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