制备方法对CoxZr1-xO2催化剂结构和氧化甲苯性能的影响
Effects of preparation methods on the structure and oxidation properties of CoxZr1-xO2 catalyst
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摘要: 采用沉淀法、水热法、热分解法和浸渍法制备了CoxZr1-xO2催化剂,考察了制备方法对其结构及甲苯氧化性能的影响.通过TG、XRD、SEM、EDS和BET等方法表征了催化剂物化性质.结果表明,水热法制备的催化剂上钴物种和锆物种分散性好、颗粒均匀呈球形、比表面积大可达82.3 m2·g-1、孔结构发达,从而具有更好的催化氧化甲苯的性能,在空速20000 mL·(g·h)-1,浓度为0.1%时完全氧化甲苯的转化温度低至260℃.Abstract: CoxZr1-xO2 catalyst was prepared by precipitation, hydrothermal, thermal decomposition and dipping methods. The effects of the preparation method on its structure and the oxidation per-formance of toluene were investigated. The physicochemical properties of the catalysts were characterized by TG, XRD, SEM, EDS and BET. The results showed that cobalt species and zirconium had good dispersion on the catalyst with uniform sphere. The specific surface area of the catalyst by hydrothermal was 82.3 m2·g-1 and the pore structure was developed. The good oxidized toluene performance of catalysts was related to species dispersion, specific surface area and pore structure. The complete oxidation of toluene conversion temperature was 260℃ under the conditions of the space velocity of 20000 mL·(g·h)-1 and the 0.1% concentration.
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Key words:
- cerium /
- zirconium /
- mixed metal oxides /
- toluene /
- catalytic oxidation /
- reactivity
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