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首页> 外文期刊>RSC Advances >Deoxygenation of coal bed methane on LaCoO3 perovskite catalyst: the structure evolution and catalytic performance
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Deoxygenation of coal bed methane on LaCoO3 perovskite catalyst: the structure evolution and catalytic performance

机译：LaCoO 3 钙钛矿催化剂对煤层气的脱氧作用：结构演变及催化性能

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A series of perovskite-type LaBO3 (B = Fe, Co, Mn, and Ni) materials have been studied as catalysts for coal bed methane (CBM) deoxygenation. Among them, LaCoO3 shows the best catalytic performance and stability, O2 could be completely eliminated by CH4 to produce CO2 and H2O in the range of 400–720 °C, and the complete deoxidization could be maintained at temperatures of 400, 500, 600, and 660 °C for 100 h. Furthermore, the structure of LaCoO3 could transform from perovskite to Co/La2O3 through La2CoO4/LaCoO3 and La2CoO4/Co3O4 during the process of CBM deoxygenation. The results of H2-TPR and O2-TPO showed the perovskite LaCoO3 is like a smart catalyst, whereby the Co species could reversibly move into and out of the perovskite structure depending on the temperature and reaction atmosphere. When Co species exist in an oxidised state (Co3O4, La2CoO4 and/or LaCoO3), the CH4 in CBM is completely oxidized by O2 to produce CO2 and H2O, the results of isotopic tracer experiments and pulse reaction demonstrate that the reaction follows the Mars–van Krevelen mechanism. However, the preferred products of the CBM deoxygenation reaction are CO and H2 on Co/La2O3 through partial oxidation of CH4. With the structure transforming from Co/La2O3 to LaCoO3 after reoxidation by O2, the activity of CBM deoxygenation could be recovered.
机译：研究了一系列钙钛矿型LaBO 3 （B = Fe，Co，Mn和Ni）材料作为煤床甲烷（CBM）脱氧催化剂。其中，LaCoO 3 表现出最好的催化性能和稳定性，O 2 可以完全被CH < small> 4 产生CO 2 和H 2 O在400-720°C的温度范围内，完全脱氧可以在400、500、600和660°C的温度下保持100小时。此外，LaCoO 3 的结构可以从钙钛矿转变为Co / La 2 O 3 通过La 2 CoO 4 / LaCoO 3 和La 2 CoO 4 / Co 3 O 4 H 2 -TPR和O 2 -TPO的结果显示钙钛矿型LaCoO 3 就像智能催化剂，根据温度和反应气氛，Co物种可逆地进入和移出钙钛矿结构。当Co处于氧化态时（Co 3 O 4 ，La 2 CoO 4 和/或LaCoO 3 ），CH 煤层气中的 4 被O 2 完全氧化生成CO 2 small>和H 2 O，同位素示踪剂实验和脉冲反应的结果表明，该反应遵循Mars–van Krevelen机理。但是，煤层气脱氧反应的优选产物是CO和在Co / La 2 O 上的H 2 small> 3 通过CH 4 的部分氧化而实现。从Co / La 2 O 3 到LaCoO 3 2 进行再氧化后，sub> 可以恢复煤层气的脱氧活性。

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