A hetero-structure activated carbon/geopolymer composite catalyst enhanced with iron was fabricated via facile activated carbon embedded polymerization and controlled impregnation. Over the temperature window of 350-500 ℃, the as-synthesized catalyst exhibited NO conversion greater than 96.5%, N₂ selectivity above 94% with stable durability, excellent SO₂ and H₂O resistance. The high NO conversion and N₂ selectivity may be associated with synergistic effects of extra-framework iron species in the geopolymer rings and excessive iron species agglomerated to form FeO_x clusters on the activated carbon surface with enhanced redox capability. These are attached to the composite catalyst’s unique hetero-structure, where the former provides active sites for lower temperature SCR while the latter provides reactivity at higher temperatures. The complex iron species in the catalyst are facile controllable through impregnation. This composite catalyst demonstrated a new approach for developing cost-effective NH₃-SCR catalysts for practical implications.

通过简便的活性炭包埋聚合和可控的浸渍制备了铁强化的异质结构活性炭/地质聚合物复合催化剂。在350-500℃的温度范围内，合成催化剂的NO转化率大于96.5％，N _2的选择性高于94％，具有稳定的耐久性，优异的SO ₂和H ₂ O耐受性。高NO转化率和N ₂选择性可能与地质聚合物环中的骨架外铁物种和团聚形成FeO _x的过量铁物种的协同效应有关聚集在活性炭表面上，具有增强的氧化还原能力。这些附着在复合催化剂的独特异质结构上，其中前者提供了较低温度SCR的活性位，而后者则提供了较高温度下的反应性。通过浸渍可以容易地控制催化剂中的复杂铁物质。这种复合催化剂证明了开发具有实际意义的具有成本效益的NH ₃ -SCR催化剂的新方法。