吸附
乙烯
沸石
高分辨率透射电子显微镜
烯烃纤维
水溶液
银纳米粒子
化学
纳米颗粒
透射电子显微镜
无机化学
核化学
化学工程
材料科学
有机化学
催化作用
纳米技术
工程类
作者
Jorge Daniel Monzón,Andrea M. Pereyra,Maximiliano R. Gonzalez,María Soledad Legnoverde,María Virginia Moreno,Nicola Gargiulo,Antonio Peluso,Paolo Aprea,Domenico Caputo,Elena Isabel Basaldella
标识
DOI:10.1016/j.apsusc.2020.148748
摘要
Ag-Zeolite-based adsorbents were prepared in order to investigate the nature of the Ag species present in the structure and its correlation with their adsorption capacity and affinity towards ethylene. Na+ in NaA were partially replaced with Ag+ by varying the AgNO3 concentration used in the aqueous solutions, obtaining two dissimilar Ag+ exchange levels. The exchanged zeolites were treated at 90 °C for 12 h and at 350 °C for 4 h in N2 atmosphere. The X-ray diffraction (XRD), UV–visible (UV–Vis), and high-resolution transmission electron microscopy (HRTEM) analyses indicated that thermal treatment could induce framework distortion and reordering of the original Ag+ into different Ag species (Ag and Ag2O nanoparticles, nanoparticulate aggregates and Agmn+ clusters). In an overall analysis, the highest adsorption capacity and affinity towards ethylene were obtained for the samples containing mainly silver cations and reoxidizing-silver species that better promote 5 s1<->π–interaction. The increase of silver loading in heat-treated zeolite could not ensure higher olefin adsorption, due to the occurrence of non-oxidizable species. Nevertheless, at low pressure, these samples showed good affinity towards ethylene. Despite presenting inactive nanoparticles against olefin, the high content of accessible charged species remnants even after high-temperature treatment could be responsible for the improved ethylene adsorption.
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