Porous nitrogen‐doped carbons (NCs) are sustainable alternatives to the toxic mercury‐based acetylene hydrochlorination catalysts applied in the manufacture of polyvinyl chloride. However, the application of NCs as metal‐free catalysts is hampered by their insufficient durability under industrially relevant process conditions. In particular, pore blockage leads to accelerated deactivation of NCs compared to the state‐of‐the‐art precious metal‐based systems. Herein, we develop a salt template‐assisted synthesis strategy coupled with chemical blowing to tune the textural properties of NCs, while preserving the N‐content and speciation. The addition of metal salts (i. e., Mg(OAc)₂ or CaCO₃) enhances gas evolution, leading to an increased formation of micro‐ and mesopores, while the in‐situ generated CaO/CaCl₂ and MgO/MgCl₂ develop auxiliary pore networks. Micropores are easily blocked during acetylene hydrochlorination, but meso‐ and macropores are structurally stable, enhancing the lifetime of hierarchical NCs by ca. 50 times compared to their non‐templated analogues, rivaling the stability of benchmark metal‐based catalysts.

中文翻译：

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通过化学吹气向长寿命的无金属乙炔氯化氢催化剂吹入具有多层孔隙的氮掺杂碳

多孔氮掺杂碳（NCs）是用于生产聚氯乙烯的有毒汞基乙炔氢氯化催化剂的可持续替代品。但是，由于NCs在工业相关工艺条件下的耐用性不足，因此阻碍了NCs作为无金属催化剂的应用。与最先进的贵金属基系统相比，孔堵塞尤其会导致NC加速失活。在本文中，我们开发了一种盐模板辅助合成策略，结合化学吹塑来调节NC的织构特性，同时保留N含量和形态。添加金属盐（即Mg（OAc）₂或CaCO ₃）促进了气体逸出，导致微孔和中孔的形成增加，而原位生成的CaO / CaCl ₂和MgO / MgCl ₂形成了辅助孔隙网络。微孔乙炔氢氯化过程中容易堵塞，但孔和大孔在结构上是稳定的，通过提高分级NC的寿命CA。与未模板化的类似物相比，可比传统金属基催化剂的稳定性高50倍。