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题名: Reverse microemulsion synthesis of LaMnAl11O19-alpha catalyst for methane combustion
作者: Xu, JG;  Tian, ZJ;  Suo, ZH;  Xu, XF;  Qu, XH;  Xu, YP;  Xu, ZS;  Lin, LW
关键词: methane ;  catalytic combustion ;  hexaaluminate ;  reverse microemulsion ;  lanthanum ;  manganese ;  ammonium carbonate ;  coprecipitation
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2005-08-01
卷: 26, 期:8, 页:665-668
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: La and Mn substituted hexaaluminate catalyst LaMnAl11O19-alpha, was synthesized by reverse microemulsion-mediated (NH4)(2)CO3 coprecipitation and conventional (NH4)(2)CO3 coprecipitation methods. Effects of preparation methods on the phase composition, BET surface area, pore construction and methane combustion activity of the catalyst were investigated. The results show that the average diameter of the precursor particles formed in the reverse microemulsion is 2. 3 nm, which is much smaller than that (30.1 nm) prepared by conventional (NH4)(2)CO3 coprecipitation. DTA results indicate that the smaller precursor particles aggregate easily in the supercritical drying process due to the dehydration among Al(OH)(3) molecules, and abundant pores form. XRD spectra show that the precursor formed in the reverse microemulsion can be converted to hexaaluminates more easily after calcination at 1200 degrees C. The BET surface area of LaMnAl11O19-alpha, prepared in reverse microemulsion is 34.01 m(2)/g, while that prepared by conventional (NH4)(2)CO3 coprecipitation is 26.92 m(2)/g. The temperatures (T-10) at which 10 % methane is converted over the two samples are 455 and 505 degrees C, respectively.
语种: 英语
WOS记录号: WOS:000231844100011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139659
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.Yantai Univ, Inst Appl Catalysis, Shandong 264005, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Xu, JG,Tian, ZJ,Suo, ZH,et al. Reverse microemulsion synthesis of LaMnAl11O19-alpha catalyst for methane combustion[J]. CHINESE JOURNAL OF CATALYSIS,2005,26(8):665-668.
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