Effect of Alkali Vapor Exposure on Ni-MgO/gamma-Al2O3/Cordierite Monolithic Catalyst for Biomass Fuel Gas Reforming

doi:10.1021/ie901370w

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	Effect of Alkali Vapor Exposure on Ni-MgO/gamma-Al2O3/Cordierite Monolithic Catalyst for Biomass Fuel Gas Reforming
	Li, Y. P.; Wang, T. J.; Wu, C. Z.; Gao, Y.; Zhang, X. H.; Wang, C. G.; Ding, M. Y.; Ma, L. L.
	2010-04-07
发表期刊	INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
ISSN	0888-5885
卷号	49 期号:7 页码:3176-3183
产权排序	[Li, Y. P.; Wang, T. J.; Wu, C. Z.; Gao, Y.; Zhang, X. H.; Wang, C. G.; Ding, M. Y.; Ma, L. L.] Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy & Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China
通讯作者	wucz@ms.giec.ac.cn
摘要	Fly ash compounds, such as alkali salts, in the raw biomass fuel gas can contaminate and deposit on traditional granular Ni-based catalysts, which resulted in catalyst deactivation and pressure increase of the downstream reformer. The impact of alkali salt exposure (KCl, K2SO4, K2CO3, by evaporation at about 7.8 mg/L for 6 h) on dry CH4/CO2 reforming of model biomass fuel gas (H-2/CO/C2H4/CH4/CO2/N-2 = 15.8/12.1/2.51/ 15.0/22.1/32.6 vol %) over Ni-MgO/gamma-Al2O3/cordierite monolithic catalyst (MC) was investigated and studied. The results showed that CH4 and CO2 conversions and CO and H-2 yields increased at 700-850 degrees C for undeposited and deposited MC. Compared with undeposited MC, the deposited catalysts show lower CH4 conversion but higher CO2 conversion and CO yield at 750-830 degrees C. The stability tests also show that CH4 conversion and H-2 content in the tail gas decreased dramatically from 87.2% to 32.0% and from 35.1% to 26.7%, respectively, after 17 h time on stream (TOS) for the deposited MC, while CH, conversion kept steady of above 90% after 60 h TOS for undeposited MC at 750 degrees C. Characterization by N-2-physisorption, XRD, ICP-AES, SEM-EDS, and XPS of MC indicate that alkali salt aerosol covering the catalyst surface or blocking mesopore channels was the main reason for the decreased reforming performance and MC deactivation, which occurred mainly at the top part of monolithic catalyst (K = 1.39 wt % by EDS), vicinal to the alkali source. The reforming of real biomass fuel gas (H-2/CO/C2H4/CH4/CO2/N-2 = 10.2/16.8/0.5/6.4/15.2/51.0 vol %) from air gasification of pine sawdust in the pilot plant (200-250 kg/h) by the reformer packed with MCP, larger in size than MC, exhibits pressure drop of less than 700 Pa, CH4 conversion of about 84%, and tar content from 4.8-5.3 g/m(3) to 0.12-0.14 g/m(3) during 60 h TOS at 600 degrees C. The porosity structure of MCP catalytic bed and relatively low alkali (K, Na = 0.03-0.07 wt %) deposition by fly ash from real biomass fuel gas were the main reasons for the excellent reformer performance.
文章类型	Article
其他摘要	Fly ash compounds, such as alkali salts, in the raw biomass fuel gas can contaminate and deposit on traditional granular Ni-based catalysts, which resulted in catalyst deactivation and pressure increase of the downstream reformer. The impact of alkali salt exposure (KCl, K2SO4, K2CO3, by evaporation at about 7.8 mg/L for 6 h) on dry CH4/CO2 reforming of model biomass fuel gas (H-2/CO/C2H4/CH4/CO2/N-2 = 15.8/12.1/2.51/ 15.0/22.1/32.6 vol %) over Ni-MgO/gamma-Al2O3/cordierite monolithic catalyst (MC) was investigated and studied. The results showed that CH4 and CO2 conversions and CO and H-2 yields increased at 700-850 degrees C for undeposited and deposited MC. Compared with undeposited MC, the deposited catalysts show lower CH4 conversion but higher CO2 conversion and CO yield at 750-830 degrees C. The stability tests also show that CH4 conversion and H-2 content in the tail gas decreased dramatically from 87.2% to 32.0% and from 35.1% to 26.7%, respectively, after 17 h time on stream (TOS) for the deposited MC, while CH, conversion kept steady of above 90% after 60 h TOS for undeposited MC at 750 degrees C. Characterization by N-2-physisorption, XRD, ICP-AES, SEM-EDS, and XPS of MC indicate that alkali salt aerosol covering the catalyst surface or blocking mesopore channels was the main reason for the decreased reforming performance and MC deactivation, which occurred mainly at the top part of monolithic catalyst (K = 1.39 wt % by EDS), vicinal to the alkali source. The reforming of real biomass fuel gas (H-2/CO/C2H4/CH4/CO2/N-2 = 10.2/16.8/0.5/6.4/15.2/51.0 vol %) from air gasification of pine sawdust in the pilot plant (200-250 kg/h) by the reformer packed with MCP, larger in size than MC, exhibits pressure drop of less than 700 Pa, CH4 conversion of about 84%, and tar content from 4.8-5.3 g/m(3) to 0.12-0.14 g/m(3) during 60 h TOS at 600 degrees C. The porosity structure of MCP catalytic bed and relatively low alkali (K, Na = 0.03-0.07 wt %) deposition by fly ash from real biomass fuel gas were the main reasons for the excellent reformer performance.
关键词	Fluidized-beds Gasification Deactivation Performance Potassium Oxidation Reactor Salts
学科领域	Engineering
WOS标题词	Science & Technology ; Technology
DOI	10.1021/ie901370w
研究领域[WOS]	Engineering
URL	查看原文
关键词[WOS]	FLUIDIZED-BEDS ; GASIFICATION ; DEACTIVATION ; PERFORMANCE ; POTASSIUM ; OXIDATION ; REACTOR ; SALTS
收录类别	SCI
语种	英语
项目资助者	MOST of China [2007CB210207]; National High Technology Research and Development Program of China [2007AA05Z416]; Natural Science Foundation of Guangdong Province China [9451007006004086]
WOS类目	Engineering, Chemical
WOS记录号	WOS:000276016100018
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/8504
专题	中国科学院广州能源研究所
作者单位	Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy & Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Li, Y. P.,Wang, T. J.,Wu, C. Z.,et al. Effect of Alkali Vapor Exposure on Ni-MgO/gamma-Al2O3/Cordierite Monolithic Catalyst for Biomass Fuel Gas Reforming[J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,2010,49(7):3176-3183.
APA	Li, Y. P..,Wang, T. J..,Wu, C. Z..,Gao, Y..,Zhang, X. H..,...&Ma, L. L..(2010).Effect of Alkali Vapor Exposure on Ni-MgO/gamma-Al2O3/Cordierite Monolithic Catalyst for Biomass Fuel Gas Reforming.INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,49(7),3176-3183.
MLA	Li, Y. P.,et al."Effect of Alkali Vapor Exposure on Ni-MgO/gamma-Al2O3/Cordierite Monolithic Catalyst for Biomass Fuel Gas Reforming".INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 49.7(2010):3176-3183.

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