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采用共沉淀法制备了Co3O4/Ce0.8Pr0.2O2催化剂,并将其用于乙醇水蒸气重整制氢反应,考察了Co3O4负载量以及Pr掺杂对催化剂性能的影响.采用X射线衍射、程序升温还原、热重分析和透射电子显微镜对催化剂的结构和表面性质进行表征.结果表明,催化剂中部分Co进入到载体的晶格中,使载体发生畸变产生更多的氧空位;载体中Pr掺杂有利于生成更多的氧空位,提高了催化剂的抗积碳性能,同时Pr掺杂可以增强Co3O4与载体之间的相互作用,提高金属Co的抗烧结性能;15%Co3O4/Ce0.8Pr0.2O2催化剂具有最好的催化活性,在反应温度为400℃,空速80 000 mL/(g.h),n(H2O)∶n(EtOH)=3的条件下可将乙醇完全转化;10 h稳定性测试结果表明该催化剂具有较好的稳定性.
The Co3O4 / Ce0.8Pr0.2O2 catalyst was prepared by coprecipitation method and used for steam reforming of ethanol with hydrogen. The effects of Co3O4 loading and Pr doping on the catalyst performance were investigated. XRD, The structure and surface properties of the catalyst were characterized by TG, TG, TG and TEM. The results showed that part of the Co in the catalyst entered into the lattice of the support and distorted the support to generate more oxygen vacancies. In addition, Pr doping can enhance the interaction between Co3O4 and support and improve the anti-sintering property of metal Co; 15% Co3O4 / Ce0.8Pr0. 2O2 catalyst has the best catalytic activity. The ethanol can be completely transformed under the conditions of reaction temperature 400 ℃, space velocity 80 000 mL / (gh) and n (H2O): n (EtOH) = 3. The stability of 10 h The test results show that the catalyst has good stability.