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Durability of Ni/TiO2 catalyst containing trace chlorine for CO selective methanation
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2018-03-08 , DOI: 10.1016/j.apcata.2018.02.032
Naohiro Shimoda , Masashi Fujiwara , Kazunori Tani , Daiki Shoji , Makoto Takahashi , Kazuya Akiyama , Shigeo Satokawa

We investigated the durability of Ni/TiO2 catalyst in CO selective methanation reaction. In the reaction test up to 72 h, trace amounts of chlorine component contained in the catalyst gradually decreased. As a result, the progress of the methanation of CO2 increased, leading to a decrease in the reaction selectivity of the methanation of CO in the title reaction. By contrast, in the early stage of the reaction in which the elimination of chlorine component was small, it was confirmed that the number of active sites of metallic Ni increased, and the CO methanation activity was improved. Furthermore, it was found that the chlorine component in the catalyst was more remarkably removed by exothermic reaction heat under the methanation reaction atmosphere as compared with the case of heat treatment under other atmosphere. Catalyst durability under the conditions simulating a daily start-up and shut-down operation that repeated a cycle of cooling and heating the temperature of the catalyst layer to room temperature was also evaluated. As a result, we revealed that a trace amount of chlorine component was removed by exposure to condensed water, leading to a decrease in the reaction selectivity of the catalyst.



中文翻译:

含微量氯的Ni / TiO 2催化剂对CO选择性甲烷化的耐久性

我们研究了Ni / TiO 2催化剂在CO选择性甲烷化反应中的耐久性。在长达72小时的反应测试中,催化剂中所含的微量氯成分逐渐减少。结果,CO 2甲烷化的进展甲烷的增加,导致标题反应中CO甲烷化的反应选择性降低。与此相对,可以确认,在氯成分的消除少的反应初期,金属Ni的活性部位增多,CO的甲烷化活性提高。此外,发现与在其他气氛下进行热处理的情况相比,在甲烷化反应气氛下通过放热反应热更明显地除去了催化剂中的氯成分。还评估了在模拟每日启动和关闭操作的条件下的催化剂耐久性,该条件重复了冷却和加热催化剂层的温度至室温的循环。因此,

更新日期:2018-03-08
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