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题名: Effect or supercritical drying on structure and activity of Mn-substituted hexaaluminate catalyst for methane combustion
作者: Xu, JG;  Tian, ZJ;  Wang, JW;  Xu, YP;  Xu, ZS;  Lin, LW
关键词: hydrothermal synthesis ;  methane ;  catalytic combustion ;  hexaaluminate ;  supercritical drying ;  urea
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2002-09-01
卷: 23, 期:5, 页:477-480
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: It was studied that the effect of supercritical drying (SCD) on the structure and activity of Mn-substituted hexaaluminate catalyst (LaMnAl11O19) for methane combustion. The catalyst was prepared by hydrothermal synthesis. Two kinds of anions (OH- and CO32-) existed in the hydrothermal reaction. The precipitation took place homogeneously and a mixture of Al(OH)(3), La-2(CO3)(3) and MnCO3 was produced. The results of differential thermal analysis-mass spectroscopy revealed that the OH groups on Al(OH)(3) were partly substituted by the oxyethyl groups during SCD process. Aggregation of Al atoms was retarded by such surface modification. The temperature of decomposition of La-2(CO3)(3) dried by SCD was about 313 K lower than that dried by conventional oven drying (COD). The temperatures of decomposition of La, (CO3)(3) and dehydration of Al(CH)(3) fell into a narrow range owing to the difference of decomposition temperature. Such a mixture of La-2 (CO3)(3) and Al(OH)(3) promoted the formation of hexaaluminate phase. The XRD demonstrated that hexaaluminate is the major phase of the catalyst dried by SCD, white LaAlO3 is the major one of the catalyst dried by COD. T-10 ( temperature for 10% conversion of methane) for the catalyst dried by SCD is 718 K, which is lower than that (773 K) for the catalyst dried by COD. The temperature for 90% conversion of methane (T-90) is decreased from 1 013 to 918 K by replacing COD with SCD method.
关键词[WOS]: OXIDES
语种: 英语
WOS记录号: WOS:000178634300022
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139141
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, Liaoning, Peoples R China

Recommended Citation:
Xu, JG,Tian, ZJ,Wang, JW,et al. Effect or supercritical drying on structure and activity of Mn-substituted hexaaluminate catalyst for methane combustion[J]. CHINESE JOURNAL OF CATALYSIS,2002,23(5):477-480.
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