Efficient and selective ethane-to-ethylene conversion assisted by a mixed proton and electron conducting membrane
Efficient and selective ethane-to-ethylene conversion assisted by a mixed proton and electron conducting membrane
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DOI：
10.1016/j.memsci.2020.117840
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发表时间：
2020-04
影响因子：
9.5
通讯作者：
Shichen Sun;Kevin Huang
中科院分区：
文献类型：
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作者：
Shichen Sun;Kevin Huang
近几十年来，由于巨大的经济潜力，将烷烃直接转化为有价值的化学品引起了学术界和工业界的极大兴趣。这种转化的一种类型是非氧化脱氢（NODH），它被认为在转化和选择性上优于其氧化对应物。然而，与焦化相关的降解是NODH路线的主要挑战。我们在这里展示了一个高效和选择性的乙烷到乙烯转化膜反应器，该反应器运行在NODH和混合电子和质子导体（MEPC）上，其组成为BaCo0.4Fe0.4Zr0.1Y0.1O3（BCFZY）。由NODH产生的h2会立即被BCFZY除去，从而改变平衡，使转化率和选择性最大化。结果表明，以湿乙烷为原料，在700℃条件下，单道乙烷制乙烯的转化率、乙烯选择性和产物收率分别为70%、90%和63%。在100小时的耐久性测试中，几乎没有观察到膜性能的退化。
Direct conversion of alkanes into valuable chemicals has attracted significant interest in recent decades by academia and industry alike due to the vast economic potential. One type of such conversions is non-oxidative dehydrogenation (NODH), which is deemed advantageous over its oxidative counterpart in conversion and selectivity. However, coking-related degradation is a major challenge to the NODH route. We here demonstrate an efficient and selective ethane-to-ethylene conversion membrane reactor operating on NODH and a mixed electron and proton conductor (MEPC) having a composition of BaCo0.4Fe0.4Zr0.1Y0.1O3(BCFZY). The H2produced from NODH is instantly removed by BCFZY, thus shifting the equilibrium to maximize conversion and selectivity. The results show that the single-pass ethane-to-ethylene conversion, ethylene selectivity and product yield at 700 °C are 70, 90 and 63%, respectively, with a moistened ethane as the feedstock. During a 100-h durability testing, there is virtually no degradation observed in membrane performance.