화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.7, No.5, 332-336, September, 2001
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Synthesis and Catalytic Properties of Niobium Carbides
Jeong-Gil Choi†, and Jung-Sik Kim
  • Department of Chemical Engineering, Division of Chemical and Polymer Engineering, Hannam University, Taejon 300-791, Korea
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The carburization of Nb2O5 (99-99%, Aldrich Chemical Co. Ltd.) was carried out using pure methane in a temperature-programmed manner. The variation in BET surface areas and oxygen uptakes of the niobium carbides was observed with different heating rates and molar hourly space velocity, suggesting that the sorption properties of these materials were strong functions of these preparative conditions used in this study. It was observed that these materials were active for ammonia decomposition reaction. While the oxygen uptake increased with increasing the BET surface area, the conversion of ammonia decomposition decreased. These results suggest that NH3 decomposition over these materials is structure-sensitive. As in the case of other transition metal carbides (V, Ta, and Mo), this structure-sensitivity was considered to be ascribed to the variations of surface composition with surface area. The conversion of ammonia decomposition for the materials prepared in the current study was observed to be comparable to that determined for the commercial niobium carbides.
Keywords:niobium carbide;NH3 decomposition;activity;surface area
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