Title of article :
Preparation and characterization of ultrafine cobalt powders and supported cobalt catalysts by freeze-drying
Author/Authors :
Xi، نويسنده , , Xiaoli and Nie، نويسنده , , Zuoren and Jiang، نويسنده , , Yabao and Xu، نويسنده , , Xiangyang and Zuo، نويسنده , , Tieyong، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
4
From page :
107
To page :
110
Abstract :
Ultrafine cobalt powders have been prepared by the freeze-drying method and supported cobalt catalysts have been prepared by a new freeze-drying immersion method. The results of XRD and SEM showed that the precursors were amorphous and most were massive with a size range of 2–5 µm. In the cobalt powders synthesized by freeze-drying, the grains were spherical in shape and with sizes ranging from 30 to 50 nm. IR analysis showed that Co existed in the precursor in the form of [Co(NH3)x]2(C2O4)3. EDS line scanning results indicated that catalysts prepared by freeze-drying could load more cobalt powders and the distribution was more homogeneous. Catalyst activity was also tested in the system of carbon monoxide oxidation. The catalysts in this research can lower the ignition temperature of CO and have increased catalytic properties.
Keywords :
Supported Co catalysts , Co powders , freeze-drying , Ultrafine particle
Journal title :
Powder Technology
Serial Year :
2009
Journal title :
Powder Technology
Record number :
1694192
Link To Document :
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