Highly durable Ru catalysts supported on CeO2 nanocomposites for CO2 methanation
Highly durable Ru catalysts supported on CeO2 nanocomposites for CO2 methanation
复制标题
DOI：
10.1016/j.apcata.2019.03.011
复制
发表时间：
2019-05-05
影响因子：
5.5
通讯作者：
Kobiro, Kazuya
中科院分区：
文献类型：
--
作者：
Hien Thi Thu Nguyen;Kumabe, Yoshitaka;Kobiro, Kazuya
利用一次细颗粒团聚所产生的高耐热性、大比表面积和表面粗糙的特点，提出了溶剂热法制备CeO2聚集体、SiO_2-CeO_2纳米复合材料和TiO_2-CeO_2纳米复合材料作为高放热反应的耐烧结性催化剂载体。采用沉淀法在载体表面沉积了分散良好的Ru金属催化剂。为了评价负载在载体上的Ru催化剂的催化活性和抗烧结性，选择了高放热反应的CO2甲烷化反应作为探针反应。正如预期的那样，所制备的CeO2聚集体和纳米复合材料上的Ru催化剂的低温(150-200℃)活性和CH4生成量都好于商业CeO2聚集体。此外，这些制备的载体上的催化剂也实现了长期稳定性(400℃，24小时；50-300℃，10个循环)。
Taking advantages of the high heat tolerance, large specific surface area, and rough surface morphology created by agglomeration of fine primary particles, a solvothermally prepared CeO2 aggregate, SiO2-CeO2 nano composite, and TiO2-CeO2 nanocomposite are proposed to be used as sintering-resistant catalyst supports in highly exothermic reactions. Well-dispersed Ru metal catalysts were deposited on support surfaces by the precipitation deposition method. The methanation of CO2 by H-2, which is a highly exothermic reaction, was selected as a probe reaction in order to evaluate the catalytic activity and sintering-resistant capability of Ru catalysts deposited on those prepared supports. As expected, the low temperature (150-200 degrees C) activity and CH4 production of the Ru catalysts on the prepared CeO2 aggregate and TiO2-CeO2 nanocomposites were better than those on commercial CeO2 aggregates. Moreover, long-term stability (400 degrees C, 24 h; 50-300 degrees C, 10 cycles) was also achieved in the catalysts on these prepared supports.