摘要
分别采用共沉淀法和溶胶 -凝胶法制备了 Fe- V- O催化剂 ,用 DTA- TG、TEM、XRD、IR和 TPR等方法对微粒的组成、表面结构及晶格氧活性进行了表征 .用化学吸附 - IR和 TPD方法考察了乙烷在 Fe- V- O催化剂表面上的吸附性能 .结果表明 :溶胶 -凝胶法制备的 Fe- V- O催化剂为超细微粒 ,粒子大小为 10～ 2 0 nm,其比表面、晶格氧的活泼性均大于共沉法制备的 Fe- V- O催化剂 .乙烷能够以 - CH3中的 H原子吸附于催化剂表面 L ewis碱位 V=O键的端氧上形成两种分子吸附态 ,随吸附温度的升高 ,乙烷的吸附强度逐渐增大 ,其乙烷吸附量远大于共沉法制备的 Fe- V-
Fe V O catalysts were prepared by the co precipitation and sol gel me thods. The composition, structure and chemisorption to ethane on the Fe V O c ata lysts were characterized by DTA TG, TEM, XRD, BET, IR, TPD MS and TPR tec hniques . The results showed that the Fe V O catalyst prepared by sol gel method cons ist s of well distributed ultrafine particles, which has a higher specific surface a rea and lattice oxygen activity than that prepared by the co precipitation meth o d. C -2H -6 can adsorb on the V=O of surface to form a molecular adsorption st ate, a nd the adsorption ability increases with the rising of the temperature. Moreover , the adsorption amount and intensity of ethane on Fe V O catalyst prepared b y s ol gel method are greater than that on Fe V O catalyst prepared by the co pr ecipitation method.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2003年第3期173-177,共5页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金 ( 2 9773 0 3 1)
国家重大基础研究前期专项 ( 2 0 0 1CCA0 3 60 0 )
