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Citation: LIU Rui-Hui, ZHANG Cun-Man, MA Jian-Xin. Al₂O₃-Modified Fe₂O₃ Based ld Catalysts with od Thermal Stability[J]. Acta Physico-Chimica Sinica, ;2009, 25(11): 2261-2269. doi: 10.3866/PKU.WHXB20091101 shu

Al₂O₃-Modified Fe₂O₃ Based ld Catalysts with od Thermal Stability

1.
School of Environmental Science and Engineering, Tongji University, Shanghai 200092, P. R. China

Received Date: 18 May 2009
Available Online: 7 September 2009

Al2O3-modified Fe2O3 based ld catalysts with od thermal stability were prepared by co-precipitation and deposition-precipitation method. Characterization techniques, such as transmission electron microscope (TEM), X-ray diffraction (XRD), N2 adsorption-desorption, and thermogravimetry-differential scanning calorimetry (TG-DSC), were used to investigate the structures, and surface morphologies of the catalysts. TEM results showed that after calcination at 500 ℃ the size distribution of the ld particles in the catalyst without Al2O3 doping was wide, the average diameter of the ld particles was about 7.0 nmand the size of the support particles ranged from 50 to 100 nm. However, the size distribution of the ld particles in the Al2O3-doped catalysts was narrow and the average diameter of the ld particles was around 5.0 nm. The Al2O3-doped Fe2O3 based Au particle size remained in a range of 30-50 nm, which is smaller than that of the Fe2O3 grains that were not doped with Al2O3. N2 adsorption-desorption measurements showed that Al2O3 doping resulted in a stable mesoporous structure for the catalysts and remained a higher specific surface area, which promoted the thermal stability of the support. XRD and TG-DSC results indicated that Al2O3 doping retarded the crystallization of the support and consequently inhibited the growth of ld particles during high-temperature calcination. Low temperature CO oxidation was used as a probe reaction to evaluate the catalytic activity. Even when calcined at 500 ℃ for 12 h, the catalyst with Al2O3 doping achieved complete CO conversion at 26.7 ℃ while the lowest temperature of the complete CO conversion (T100) of the catalyst without Al2O3 doping was as high as 61.6 ℃. Apparently, thermal stability is enhanced considerably by Al2O3 doping.
- Nano-structured ld catalyst,
- Ferric oxide support,
- Thermal stability,
- Al2O3,
- CO oxidation at low-temperature
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Al2O3-Modified Fe2O3 Based ld Catalysts with od Thermal Stability

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通讯作者: 陈斌, bchen63@163.com

Al₂O₃-Modified Fe₂O₃ Based ld Catalysts with od Thermal Stability