【摘要】 采用均相法制得Ce0.8Zr0.2O2载体,并以其为载体等体积浸渍制得一系列负载型Ru催化剂。在0.1 MPa、GHSV为10000 h-1、H2/CO2为3.5(物质的量比)的条件下,对催化剂进行评价。借助TG-DSC、BET、H2-TPR等技术对所制备的载体和催化剂进行表征,结果表明,500℃焙烧的载体具有适中的比表面积和孔径并形成了Ce-Zr固溶体,与载体形成弱相互作用的Ru能够显著提高催化剂的活性,适宜的还原方式能促进活性组分的均匀分布。采用500℃焙烧的载体浸渍Ru Cl3溶液,干燥后在400℃焙烧,并使用水合肼和H2两次还原后的催化剂活性最高,在290℃时,H2转化率可达到93.57%。更多还原

【Abstract】 A series of Ru / Ce0.8Zr0.2O2 catalysts were prepared by the impregnation method with Ce0.8Zr0.2O2 homoprecipitated and calcined at different temperatures as supports. The supports and the catalysts were characterized with TG-DSC,BET and H2-TPR techniques. It was shown that the Ce0.8Zr0.2O2 calcined at 500 ℃formed Ce-Zr solid solution and had a proper surface area and pore opening and a weak interaction with Ru species,leading to a significant increase in the catalytic activity. A suitable reduction methods promoted distribution of active species. The Ru / Ce0.8Zr0.2O2 prepared with the Ce0.8Zr0.2O2 calcined at 500 ℃ showed high activity after calcination at 400 ℃ and successive reduction with H2N·NH2·H2O and H2. It gave a H2 conversion of 93.57%,approaching to the equilibrium value under the conditions of 290 ℃,0.1 MPa,10 000 h-1and H2/CO2 mol ratio of 3.5.更多还原