Riaz Asim, Ali Muhammad Umair, Enge T Gabriel, Tsuzuki Takuya, Lowe Adrian, Lipiński Wojciech
Research School of Electrical, Energy and Materials Engineering, The Australian National University, Canberra ACT 2601, Australia.
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
Research (Wash D C). 2020 Jan 29;2020:3049534. doi: 10.34133/2020/3049534. eCollection 2020.
The effects of V and Ce concentrations (each varying in the 0-100% range) in vanadia-ceria multiphase systems are investigated for synthesis gas production thermochemical redox cycles of CO and HO splitting coupled to methane partial oxidation reactions. The oxidation of prepared oxygen carriers is performed by separate and sequential CO and HO splitting reactions. Structural and chemical analyses of the mixed-metal oxides revealed important information about the Ce and V interactions affecting their crystal phases and redox characteristics. Pure CeO and pure VO are found to offer the lowest and highest oxygen exchange capacities and syngas production performance, respectively. The mixed-oxide systems provide a balanced performance: their oxygen exchange capacity is up to 5 times higher than that of pure CeO while decreasing the extent of methane cracking. The addition of 25% V to CeO results in an optimum mixture of CeO and CeVO for enhanced CO and HO splitting. At higher V concentrations, cyclic carbide formation and oxidation result in a syngas yield higher than that for pure CeO.
研究了钒铈多相体系中钒（V）和铈（Ce）浓度（均在0 - 100%范围内变化）对合成气生产的影响，该合成气生产涉及与甲烷部分氧化反应耦合的CO和H₂O分解的热化学氧化还原循环。制备的氧载体的氧化通过单独且依次进行的CO和H₂O分解反应来进行。混合金属氧化物的结构和化学分析揭示了有关Ce和V相互作用的重要信息，这些相互作用影响其晶相和氧化还原特性。发现纯CeO₂和纯V₂O₅分别具有最低和最高的氧交换容量以及合成气生产性能。混合氧化物体系提供了平衡的性能：其氧交换容量比纯CeO₂高5倍，同时降低了甲烷裂解的程度。向CeO₂中添加25%的V会形成CeO₂和CeVO₄的最佳混合物，以增强CO和H₂O的分解。在较高的V浓度下，循环碳化物的形成和氧化导致合成气产率高于纯CeO₂。
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