In this work, meso-structured siliceous form materials (SFM) were synthesized from oil shale ash via a green and time-saving microemulsion templating method and modified with polyethleneimine (PEI) for post-combustion carbon capture. The effects of preparation conditions, such as P123/TMB ratio, aging temperature and pH values, on sample morphology and pore structure were studied to understand the characteristics of inorganic silica precursors. Results show that the SFMs possess 3-dimensional porous framework with a large surface area of 901.3 m³/g and a pore volume of 2.0 cm³/g. The CO₂ adsorption behaviour of PEI-impregnated SFMs were investigated in terms of CO₂ adsorption capacity and temperature swing adsorption (TSA) cycling stability under a simulated flue gas condition (75 °C and 15% CO₂/N₂). The results show that pore-expanded SFMs with 50 wt% PEI loading exhibited higher CO₂ uptake (109 mg/g-adsorbent) compared to non-pore-expended materials (50 mg/g-adsorbent) and no appreciable reduction in CO₂ uptake was observed in the first 10 cycles. However, the DRIFTS spectra of CO₂-evacuated adsorbents revealed the presence of alkylammonium carbamates residuals and formations of urea species. This could explain the reduction in CO₂ adsorption capacity after 10 cycles.

在这项工作中，通过绿色环保且节省时间的微乳液模板化方法，从油页岩灰中合成了中观结构的硅质成型材料（SFM），并用聚乙烯亚胺（PEI）进行了改性，以用于燃烧后碳捕获。研究了制备条件（如P123 / TMB比，时效温度和pH值）对样品形态和孔结构的影响，以了解无机二氧化硅前体的特性。结果表明，SFM具有3维多孔骨架，其表面积大为901.3m ³ / g，孔体积为2.0cm ³ / g。该CO ₂ PEI浸渍SFMS的吸附行为在CO方面进行了研究₂模拟烟气条件（75°C和15％CO ₂ / N ₂）下的吸附容量和变温吸附（TSA）循环稳定性。结果表明，与未扩孔的材料（50 mg / g吸附剂）相比，PEI含量为50 wt％的扩孔SFM表现出更高的CO ₂吸收量（109 mg / g吸附剂），并且没有明显的CO ₂降低。在前10个周期中观察到摄取。然而，CO ₂抽空的吸附剂的DRIFTS光谱揭示了氨基甲酸烷基铵残留物的存在和尿素种类的形成。这可以解释10个循环后CO ₂吸附能力的降低。