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Citation: ZHAN Ying-Ying, CAI Guo-Hui, ZHENG Yong, SHEN Xiao-Nv, ZHENG Ying, WEI Ke-Mei. Synthesis of High Surface Area Silicon Carbide and Its Application in CO Oxidation Reaction[J]. Acta Physico-Chimica Sinica, ;2008, 24(01): 171-175. doi: 10.3866/PKU.WHXB20080131 shu

Synthesis of High Surface Area Silicon Carbide and Its Application in CO Oxidation Reaction

1.
National Engineering Research Center of Chemical Fertilizer Catalyst at Fuzhou University, Fuzhou 350002, P. R. China; College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, P. R. China

Received Date: 26 August 2007
Available Online: 24 October 2007

A sol-gel process was employed to prepare SiC precursors, using tetraethyl orthosilicate (TEOS) and sucrose as raw materials. And oxalic acid, ferric nitrate, and nickel nitrate were added respectively as catalyst for hydrolysis and polymeration reactions. The effects of catalyst, reaction temperature, and reaction time on the gel formation were studied. The results showed that ferric nitrate was optimal for gel formation. SiC of 133 m2·g-1 was obtained by further carbonthermal reduction of the xerogel from the sol-gel system involved ferric nitrate, at 1350 ℃ in an Ar flow for 10 h. Such SiC was then used as catalyst support for CO oxidation. Wet impregnation method was adopted to obtain Pt/SiC catalyst. The as-prepared Pt/SiC catalyst showed od activity and stability for CO oxidation. It was also found that its performance could be improved significantly with the synergistic action of Ni promoter.
- Sol-gel; Silicon carbide; High surface area; CO oxidation; Support
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