Abstract Three series of mesoporous adsorbents designed for removal of methyl ethyl ketone vapor (MEK) were synthesized: MCM-41 was decorated with various amounts of novolac resin (Nov) and polyacrylonitrile (PAN), while SBA-15 was modified with PAN. The composites were thermally activated towards an enhancement of MEK adsorption capacity and tested in a fixed bed adsorber. Structural features of parent silicas were investigated by XRD, while textural parameters of the composites were studied by low-temperature nitrogen adsorption. A surface composition was examined by DRIFT and XPS. It was found that decoration of the silica surface with small amounts of PAN improved the monolayer adsorption capacity. The MEK breakthrough curves and desorption profiles were employed for calculation of the monolayer capacity and total pore volume (VtotalMEK). The VtotalMEK for the materials with smaller pores (MCM-41) were comparable to those determined by nitrogen adsorption, whereas respective values for the solids with larger pores (SBA-15) were underestimated. The mechanism of adsorption of MEK onto the adsorbents was elucidated. The MEK molecules were adsorbed solely in the form of keto tautomer. The enhanced MEK adsorption capacity came from the beneficial textural features of the support and the presence of a ladder-type PAN structure containing O-groups.

中文翻译：

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甲基乙基酮在热活化聚合物修饰的 MCM-41 和 SBA-15 上的动态吸附-解吸

摘要 合成了三个系列的用于去除甲乙酮蒸气 (MEK) 的介孔吸附剂：MCM-41 用不同量的酚醛树脂 (Nov) 和聚丙烯腈 (PAN) 修饰，SBA-15 用 PAN 修饰。复合材料被热活化以提高 MEK 吸附能力，并在固定床吸附器中进行测试。通过XRD研究了母体二氧化硅的结构特征，而通过低温氮吸附研究了复合材料的结构参数。通过DRIFT和XPS检查表面组成。发现用少量 PAN 装饰二氧化硅表面提高了单层吸附能力。MEK 穿透曲线和解吸曲线用于计算单层容量和总孔体积 (VtotalMEK)。具有较小孔隙的材料 (MCM-41) 的 VtotalMEK 与通过氮吸附确定的那些相当，而具有较大孔隙的固体 (SBA-15) 的相应值被低估了。阐明了 MEK 在吸附剂上的吸附机理。MEK 分子仅以酮互变异构体的形式被吸附。增强的 MEK 吸附能力来自载体的有益纹理特征和包含 O 基团的梯型 PAN 结构的存在。