Alkane dehydrogenation in scalable and electrifiable carbon membrane reactor
Alkane dehydrogenation in scalable and electrifiable carbon membrane reactor
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DOI：
10.1016/j.xcrp.2023.101692
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发表时间：
2023-11
影响因子：
8.9
通讯作者：
Lu Liu;A. Bhowmick;Sichao Cheng;Borja Hernandez Blazquez;Ying Pan;Junyan Zhang;Yuan Zhang
中科院分区：
文献类型：
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作者：
Lu Liu;A. Bhowmick;Sichao Cheng;Borja Hernandez Blazquez;Ying Pan;Junyan Zhang;Yuan Zhang
非氧化性烷烃脱氢生成烯烃和氢气产品。目前的工艺面临三个挑战：热力学导致的转化率有限，催化剂快速失活，以及工艺加热产生的二氧化碳排放。膜反应器通过原位脱氢来克服热力学极限，但催化剂和膜都有快速失活的趋势。在这里，我们报道了一种集成了透氢碳分子筛(CMS)中空纤维膜和硅质沸石负载金属催化剂的炭膜反应器。通过使用低阈值温度的催化剂降低反应温度，以及用CMS膜克服热力学限制，我们实现了高转化率和催化剂的稳定性。CMS膜的导电性质使反应能够进行焦耳加热，从而减少二氧化碳排放。我们展示了一种CMS膜反应器，具有创纪录的高稳定性，用于丙烯和乙烯的生产，这两种化学品是全球第二和第一大容量的化学品用作原料。
Non-oxidative alkane dehydrogenation produces alkene and hydrogen products. The current processes face three challenges: limited conversion due to thermodynamics, rapid catalyst deactivation, and CO2emissions from process heating. A membrane reactor (MR) has the potential to overcome the thermodynamic limit by removing H2in situ, but both catalyst and membrane tend to deactivate quickly. Here, we report a carbon membrane reactor that integrates H2-permeable carbon molecular sieve (CMS) hollow fiber membranes and siliceous zeolite-supported metal catalysts. By lowering the reaction temperature using catalysts with a low threshold temperature and by overcoming the thermodynamic limit with CMS membranes, we achieve high conversion and catalyst stability. The electro-conductive nature of the CMS membrane enables joule heating of the reaction, reducing CO2emissions. We demonstrate a CMS membrane reactor with record-high stability for propylene and ethylene production, the second- and first-largest-volume chemicals used as feedstock globally.