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题名: Hydrothermal synthesis of la-mn-hexaaluminates for the catalytic combustion of methane
作者: Xu, JG;  Tian, ZJ;  Wang, JW;  Xu, YP;  Xu, ZS;  Lin, LW
关键词: methane ;  catalytic combustion ;  hydrothermal synthesis ;  hexaaluminate ;  urea hydrolysis
刊名: KOREAN JOURNAL OF CHEMICAL ENGINEERING
发表日期: 2003-03-01
卷: 20, 期:2, 页:217-221
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Hydrothermal synthesis by using urea. hydrolysis at 1.0-3.0 MPa and 120-130 degreesC was employed to prepare Mn-substituted hexaaluminate catalysts for methane combustion. The results from DTA-MS demonstrated that CO32- and OH- anions co-exist in the hydrothermal reaction. XRD reveals that the components of carbonates and hydroxides in the hydrothermal reaction are more favorable than those in the (NH4)(2)CO3 co-precipitation for the formation of the Mn-substituted hexaaluminate phase. After calcination at 1,200degreesC for 2 h, LaMnAl11O9 is the major phase of the catalyst prepared by the hydrothermal synthesis method while LaAlO3 is the major one of the catalysts prepared by NH4OH and (NH4)(2)CO3 co-precipitation. The catalyst prepared by hydrothermal synthesis has higher activity than that prepared by NH4OH and (NH4)(2)CO3 co-precipitation. The major reason is that more Mn2+ ions have incorporated into the hexaaluminate lattice. The effect of drying methods on the formation of hexaaluminate phase was also discussed.
关键词[WOS]: STABILITY ;  PALLADIUM
语种: 英语
WOS记录号: WOS:000181945600004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138382
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.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Xu, JG,Tian, ZJ,Wang, JW,et al. Hydrothermal synthesis of la-mn-hexaaluminates for the catalytic combustion of methane[J]. KOREAN JOURNAL OF CHEMICAL ENGINEERING,2003,20(2):217-221.
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