文献类型：期刊文献

英文题名：Gas-assisted exfoliation montmorillonite into mono-layered nanosheets for the removal of olefins from aromatics

作者：Yao, Xiaoyu[1];Luo, Tianyi[1];Yin, Tao[1];Lou, Shifeng[1];Meng, Xuan[1];Liu, Naiwang[1];Shi, Li[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2021

卷号：306

外文期刊名：FUEL

收录：;EI(收录号：20213510832027);WOS:【SCI-EXPANDED(收录号:WOS:000702850900008)】；

基金：We are so grateful and want to extend our sincere appreciations for the financial support from National Natural Science Foundation of China (NO. 21808054) .

语种：英文

外文关键词：Montmorillonite; Mono-layer; Thermal expansion gas-assisted exfoliation; Alkylation

摘要：To date, the scalable exfoliation of the resource-rich montmorillonite (MMT) into high-quality few-layered nanosheets still remains a grand challenge. Herein, a simple, nontoxic, and efficient strategy is proposed to exfoliate layered MMT into mono-layered MMT nanosheets (MMTNS) via thermal expansion gas-assisted exfoliation method. The essence of this method is that the high temperature expands the interlayer distance while weakens the van der Waals force between interlayer of bulk MMT and then the liquid nitrogen (L-N2) penetrated the interlayers can be quickly vaporized to exfoliate the MMT. With a high mass yield of 18-20%, the prepared MMTNS has a thickness around 1.9 nm and a reasonable aspect ratio (lateral dimension of 0.5 mu m-3 mu m). Meanwhile, no impurities were introduced during the whole procedure. Additionally, the exfoliated MMTNS with high specific surface area (402 m2 g-1) and more exposed acid sites is further applied for the removal of trace olefins from aromatics, the result shows higher olefin conversion (76.97%) than its parent bulk phase (50.66%). The possible reaction mechanism of removing olefins from aromatics was further proposed and investigated by gas chromatography-mass spectrometry (GC-MS).