Performance characteristics of auto-methanation using Ru/CeO2 catalyst, autonomously proceeding at room temperature
Performance characteristics of auto-methanation using Ru/CeO2 catalyst, autonomously proceeding at room temperature
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DOI：
10.1016/j.fuel.2020.118619
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发表时间：
2020-12
期刊：
影响因子：
7.4
通讯作者：
Nozomu Hirata;R. Watanabe;C. Fukuhara
中科院分区：
文献类型：
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作者：
Nozomu Hirata;R. Watanabe;C. Fukuhara
以工业废气处理为背景，考察了Ru/CeO 2催化剂在原料气中氧气共存时的甲烷化特性。氧气浓度的变化显着影响甲烷化活性，并高于2体积%，甲烷化开始自主在室温区域，展示自动甲烷化（AM）的行为。在这种情况下，氧气选择性地与氢气结合，并且不燃烧所产生的甲烷。将原料气体中的氧浓度和供给流量作为参数，在映射信息中汇总了室温区域中的AM的启动状态和发热状态。在室温下开始的AM在相当长的时间内表现出恒定的活性和甲烷选择性，以及恒定的甲烷化特征，即使在重复启动和关闭的日常启动和关闭（DSS）操作期间也是如此。Ru/CeO 2催化剂的表面形貌在DSS操作中的变化是微不足道的。因此，甲烷化系统在本研究中被认为是高度适用的工业CO2处理技术。
Assuming the treatment of exhaust gas from an industrial process, the methanation characteristics of a Ru/CeO2catalyst are investigated when oxygen coexisted in the raw material gas. The change in oxygen concentration significantly affected methanation activity, and above 2 vol%, the methanation started autonomously at a room-temperature region, demonstrating auto-methanation (AM) behavior. In this case, oxygen selectively combused hydrogen and did not burn the produced methane. The start-up state and heat generation state of the AM in the room-temperature region are summarized in the mapping information using the oxygen concentration in the raw material gas and feeding flow rate as parameters. The AM that started at room temperature demonstrated constant activity and methane selectivity for a considerably long time, as well as constant methanation characteristics even during daily start-up and shut down (DSS) operations, which repeatedly starts and shuts down. The change in the surface morphology of the Ru/CeO2catalyst in the DSS operation is insignificant. Thus, the methanation system constructed in this study is considered to be highly applicable as an industrial CO2treatment technology.