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Effect or supercritical drying on structure and activity of Mn-substituted hexaaluminate catalyst for methane combustion
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
2002-09-01
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
关键词[WOS]OXIDES
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.
语种英语
WOS记录号WOS:000178634300022
引用统计
被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/139141
专题中国科学院大连化学物理研究所
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Liaoning, Peoples R China
推荐引用方式
GB/T 7714
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.
APA Xu, JG,Tian, ZJ,Wang, JW,Xu, YP,Xu, ZS,&Lin, LW.(2002).Effect or supercritical drying on structure and activity of Mn-substituted hexaaluminate catalyst for methane combustion.CHINESE JOURNAL OF CATALYSIS,23(5),477-480.
MLA Xu, JG,et al."Effect or supercritical drying on structure and activity of Mn-substituted hexaaluminate catalyst for methane combustion".CHINESE JOURNAL OF CATALYSIS 23.5(2002):477-480.
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