Syntheses of La1-xBaxMn2Al10O19 Catalysts (x = 0, 0.05) in a Novel Microemulsion of Water/2
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- 作者：Fei Teng ; Shuhui Liang ; Buergen Gauge ; Yongfa Zhu ; Jinguang Xu ; Guodong Wen ; Zhijian Tian ; Zheming Wang ; Xiaomei Yang ; Guoxing Xiong
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：July 26, 2007
- 年：2007
- 卷：111
- 期：29
- 页码：10941 - 10947
- 全文大小：445K
- 年卷期：v.111,no.29(July 26, 2007)
- ISSN：1932-7455
文摘
In this work, a novel system of water/2-propanol/1-butanol (W/iP/nB) was developed to synthesizeLa1-xBaxMn2Al10O19 (x = 0, 0.05) catalysts. These catalysts were also synthesized by the hydrolysis of thealkoxides in distilled water. The physicochemical properties of the catalysts were characterized by transmissionelectron microscopy, X-ray powder diffraction, and N2 adsorption isotherm measurements. The effects of thereaction medium and drying method on the properties of the catalysts were investigated. The results showedthat La0.95Ba0.05Mn2Al10O19 catalyst synthesized in W/iP/nB had a higher activity in methane combustion(T10% = 425 
C; T10% = the temperature at 10% methane conversion) than that prepared in distilled water(T10% = 515 C). After the reaction was run at 700 C for 100 h under the reaction conditions, La0.95Ba0.05Mn2Al10O19 catalyst synthesized in W/iP/nB showed a higher stability than that prepared in distilled water.The LaMn2Al10O19 synthesized by subcritical drying showed a higher activity (T10% = 440 C) than thatprepared by conventional oven drying. La0.95Ba0.05Mn2Al10O19 catalyst showed a higher activity than LaMn2Al10O19, which was ascribed to the partial substitution of Ba for La. Furthermore, the structure property ofwater in W/iP/nB was investigated by means of FT-IR, NMR, electric conductivity, and laser light scatteringgranulometry. It was proposed that a novel reverse microemulsion of W/iP/nB is formed by distilled water,2-propanol, and 1-butanol. The hydrolysis of the alkoxides in W/iP/nB was controlled efficiently, just as ina conventional reverse microemulsion.
C; T10% = the temperature at 10% methane conversion) than that prepared in distilled water(T10% = 515 C). After the reaction was run at 700 C for 100 h under the reaction conditions, La0.95Ba0.05Mn2Al10O19 catalyst synthesized in W/iP/nB showed a higher stability than that prepared in distilled water.The LaMn2Al10O19 synthesized by subcritical drying showed a higher activity (T10% = 440 C) than thatprepared by conventional oven drying. La0.95Ba0.05Mn2Al10O19 catalyst showed a higher activity than LaMn2Al10O19, which was ascribed to the partial substitution of Ba for La. Furthermore, the structure property ofwater in W/iP/nB was investigated by means of FT-IR, NMR, electric conductivity, and laser light scatteringgranulometry. It was proposed that a novel reverse microemulsion of W/iP/nB is formed by distilled water,2-propanol, and 1-butanol. The hydrolysis of the alkoxides in W/iP/nB was controlled efficiently, just as ina conventional reverse microemulsion.