【摘要】 采用沉淀法制备了CrO_x/ZrO₂催化剂,考察800℃高温焙烧的CrO_x/ZrO₂催化剂对CH₄燃烧的催化性能。采用X射线衍射和拉曼光谱等技术对催化剂进行物相结构表征。结果表明,Cr物种以Cr₂O₃形式存在,随着焙烧温度升高,催化剂中ZrO₂和Cr₂O₃的晶粒明显增大。CrO_x/ZrO₂催化剂的比表面积大于相应的纯Cr₂O₃和ZrO₂。催化剂的CH₄燃烧活性随着Cr含量的增加而提高,Cr质量分数20%时活性最高,CH₄完全燃烧温度为450℃。更多还原

【Abstract】 A series of CrO_x/ZrO₂ catalysts were prepared by the deposition-precipitation method, and the catalytic activity of CrO_x/ZrO₂ catalysts calcined at 800℃ for CH₄ catalytic combustion was investigated. The catalysts were characterized by X-ray diffraction （XRD）, Raman spectroscopy techniques. The results indicated that chromium species in the catalysts existed in the form of Cr₂O₃, and the crystallite sizes of Cr₂O₃ and ZrO₂ increased with the increase of calcination temperature. The surface area of CrO_x/ZrO₂ catalysts was larger than these of pure Cr₂O₃ and ZrO₂. The catalytic activity of CrO_x/ZrO₂ catalysts for CH₄ combustion was enhanced with the increase of chromium content and CrO_x/ZrO₂ catalyst with 20% Cr（mass fraction） calcined at 800℃ exhibited the highest activity.CH₄ complete combustion temperature over the catalyst was 450 ℃.更多还原