Citation:
CHEN Yong-Dong, WANG Lei, TANG Shui-Hua, CAO Hong-Yan, NG Mao-Chu, CHEN Yao-Qiang. Effect of Ce0.45Zr0.45Y0.07La0.03O1.95/La-Ba-Al2O3 Mass Ratio on the Activity of Fe-Based Monolithic Catalysts for the Combustion of Thin Methane[J]. Acta Physico-Chimica Sinica,
;2012, 28(05): 1237-1242.
doi:
10.3866/PKU.WHXB201203141
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Ce0.45Zr0.45Y0.07La0.03O1.95, an oxygen storage material (OSM), and La-Ba-Al2O3 have been prepared by co-precipitation and peptization, respectively, to be used as supports for Fe2O3 catalysts. The Fe2O3 catalysts were obtained by impregnation methods and then coated on the monolith. The catalytic combustion of low concentration (thin) methane was investigated over the prepared catalysts. The effect of the OSM/La-Ba-Al2O3 mass ratio on the physicochemical properties of the catalysts was investigated using nitrogen adsorption-desorption, oxygen storage capacity (OSC) measurements, X-ray diffraction (XRD), and H2-temperature-programmed reduction (H2-TPR). The highest catalytic activity of both fresh and aged Fe2O3 catalysts for thin methane combustion was observed when the mass ratio of OSM/La-Ba-Al2O3 was 1:1. At this OSM/La-Ba-Al2O3 mass ratio, methane started to convert at 446 °C and completely converted at 553 ° C, with 1% (volume fraction) CH4 and a gas hourly space velocity (GHSV) of 50000 h-1. The Fe-based monolithic catalysts with different mass ratios of OSM to La-Ba-Al2O3 had different specific surface areas and reducibilities. XRD results showed that OSM existed in uniform solid solution and Fe2O3 was well dispersed on the binary supports. Based on the characterizations, the high catalytic activity and thermal stability of the catalysts can be attributed to the proper coordination of OSM and La-Ba-Al2O3 for thin methane combustion.
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