Programmable heating and quenching for efficient thermochemical synthesis
Programmable heating and quenching for efficient thermochemical synthesis
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DOI：
10.1038/s41586-022-04568-6
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发表时间：
2022-05-19
期刊：
影响因子：
64.8
通讯作者：
Hu, Liangbing
中科院分区：
文献类型：
--
作者：
Dong, Qi;Yao, Yonggang;Hu, Liangbing
通过在近平衡条件下连续加热的常规热化学合成在提高合成速率、选择性、催化剂稳定性和能量效率方面面临关键挑战，这是由于缺乏对反应温度和时间的时间控制，因此缺乏对反应途径的时间控制（1-3）。作为替代方案，我们提出了一种非平衡连续合成技术，该技术使用可编程电流进行脉冲加热和猝灭（例如，0.02秒开启，1.08秒关闭），以在高温（例如，高达2，400 K）和低温之间快速切换反应。快速骤冷确保了高选择性和良好的催化剂稳定性，并降低了平均温度以降低能源成本。使用CH 4热解作为模型反应，我们的可编程加热和淬火技术导致高选择性的增值C-2产品（>75%，
Conventional thermochemical syntheses by continuous heating under near-equilibrium conditions face critical challenges in improving the synthesis rate, selectivity, catalyst stability and energy efficiency, owing to the lack of temporal control over the reaction temperature and time, and thus the reaction pathways(1-3). As an alternative, we present a non-equilibrium, continuous synthesis technique that uses pulsed heating and quenching (for example, 0.02 s on,1.08 s off) using a programmable electric current to rapidly switch the reaction between high (for example, up to 2,400 K) and low temperatures. The rapid quenching ensures high selectivity and good catalyst stability, as well as lowers the average temperature to reduce the energy cost. Using CH4 pyrolysis as a model reaction, our programmable heating and quenching technique leads to high selectivity to value-added C-2 products (>75% versus