Porous materials with high Brunauer-Emmett-Teller (BET) surface area (S_BET) and abundant ionic active sites facilitate efficient CO₂ capture and conversion. Herein, a kind of novel benzimidazole-based hyper-cross-linked poly(ionic liquid)s (HPILs) were developed via the hyper-cross-linking strategy and the as-prepared HPILs possessed high S_BET (485-780 m²/g), plentiful micro/mesoporosity, and abundant ionic active sites. The HPILs showed noteworthy CO₂ uptake (79-143 mg/g at 273 K and 1.0 bar), moderate isosteric heats (32-45 kJ/mol), and acceptable CO₂/N₂ selectivity (IAST: 23-46). Intriguingly, HPILs-Cl-2 exhibited excellent catalytic activity for CO₂ cycloaddition and 99% of propylene oxide was successfully converted to cyclic carbonates under mild conditions (70°C, 0.1 MPa CO₂, 9 h). This synthetic strategy is of great importance for the functionalized hyper-cross-linked polymers and the synthesized HPILs are promising for efficient CO₂ capture and conversion under mild conditions.

具有高Brunauer-Emmett-Teller（BET）表面积（S _BET）和丰富的离子活性位的多孔材料有助于有效地捕获和转化CO ₂。在本文中，通过超交联策略开发了一种新型的基于苯并咪唑的超交联聚离子液体（HPILs），所制备的HPILs具有较高的S _BET（485-780 m ² / g），大量的微/中孔性和丰富的离子活性位点。HPILs表现出值得注意的CO ₂吸收（在273 K和1.0 bar下为79-143 mg / g），中等等规度热量（32-45 kJ / mol）和可接受的CO ₂ / N ₂选择性（IAST：23-46）。有趣的是，HPILs-CL-2表现出优异的催化活性为CO ₂环加成和环氧丙烷的99％在温和条件下被成功转换为环状碳酸酯（70℃，0.1兆帕CO ₂，9 H）。这种合成策略对于功能化的超交联聚合物非常重要，合成的HPIL在温和条件下有望有效捕获和转化CO ₂。