The pore structure of mesoporous silica is crucial to its application as a substrate for CO₂ capture sorbents. In this work, the synthesis of resin-templated silica, a new class of hierarchically meso-/macroporous silica for fabrication of CO₂ capture sorbents, was reported. Unlike the conventional acid-catalyzed synthesis of mesoporous silica using self-assembled surfactant or block copolymer templates, the resin-templated silica is derived from porous ion-exchange resin templates using a catalyst-free method that involves three simple steps of silane soaking, moisture exposure, and air calcination. The resin-templated silica reproduced the spherical shape of the porous ion-exchange resin template. It was also found that pores in resin templates were crucial to creating mesoporosity in resin-templated silica. The resin-templated silica has simultaneous attractive surface area and pore volume, which were both substantially higher than those of the ion-exchange resin template. Impregnation of the mesopores and macropores by polymeric amine provided novel amine-oxide sorbents for CO₂ capture, that is, resin-templated sorbents. The resin-templated sorbents impregnated using a 15 wt % polyethylenimine (PEI)/methanol solution showed competitive direct air capture (at 400 ppm) performance with a CO₂ sorption capacity of 2.1 mmol of CO₂/g of SiO₂ and amine efficiency of 0.11 mol of CO₂/mol of N at an amine loading of 0.83 g of PEI/g of SiO₂.

中文翻译：

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具有分级孔的离子交换树脂模板碳捕获吸附剂


介孔二氧化硅的孔结构对其作为 CO ₂ 捕获吸附剂基质的应用至关重要。在这项工作中，报道了树脂模板二氧化硅的合成，这是一种用于制造 CO ₂ 捕获吸附剂的新型分级介孔/大孔二氧化硅。与使用自组装表面活性剂或嵌段共聚物模板的传统酸催化合成介孔二氧化硅不同，树脂模板二氧化硅是使用无催化剂方法从多孔离子交换树脂模板衍生而来，涉及硅烷浸泡、水分三个简单步骤暴露和空气煅烧。树脂模板二氧化硅再现了多孔离子交换树脂模板的球形形状。还发现树脂模板中的孔对于在树脂模板二氧化硅中产生介孔性至关重要。树脂模板二氧化硅同时具有吸引人的表面积和孔体积，两者都显着高于离子交换树脂模板。用聚合胺浸渍中孔和大孔提供了用于CO ₂ 捕获的新型氧化胺吸附剂，即树脂模板吸附剂。使用 15 wt% 聚乙烯亚胺 (PEI)/甲醇溶液浸渍的树脂模板吸附剂表现出有竞争力的直接空气捕获（400 ppm）性能，CO ₂ 吸附容量为 2.1 mmol CO ₂ 和胺效率为 0.11 mol CO ₂ /mol N，胺负载量为 0.83 g PEI/g SiO ₂