文献类型：期刊文献

英文题名：Coal Fly Ash to Y Zeolite of Great Purity and Crystallinity: A New and Green Activation Method of Combined in Situ Microwave and Ultrasound

作者：Chen, Zongrong Song, Guoqiang Li, Claudia Chen, Wenting Li, Ziwei Kawi, Sibudjing

第一作者：Chen, Zongrong

机构：[1] School of Chemistry and Chemical Engineering, Guizhou Provincial Key Laboratory of Green Chemical and Clean Energy Technology, Guizhou University, Guiyang, 550025, China; [2] School of Chemical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China; [3] Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585, Singapore

第一机构：School of Chemistry and Chemical Engineering, Guizhou Provincial Key Laboratory of Green Chemical and Clean Energy Technology, Guizhou University, Guiyang, 550025, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220444475)

语种：英文

外文关键词：Ammonia - Chemical activation - Coal - Coal ash - Crystallinity - Extraction - Fly ash - Fourier transform infrared spectroscopy - Hydrogen bonds - Magic angle spinning - Microwave irradiation - Pyridine - Silica - Silicon - Temperature programmed desorption - Zeolites

摘要：Highly crystalline and pure Y (FAU) zeolite were synthesized from coal fly ash (CFA) using a combined in situ microwave and ultrasonic irradiation-assisted method, improving the extraction efficiency of silicon and aluminum from coal fly ash with limited energy usage relative to conventional microwave or ultrasound methods. Significant improvement in the combined method was evident following activation in 4 mol/L sodium hydroxide solution for 1 h at 100 °C whereby 39.80 wt.% conversion of CFA was attained along with 70.26 mol.% conversion of Si and 68.03 mol.% conversion of Al. The Si to Al ratio (SAR) of the as-obtained CFA-based Y zeolite was 4.65 with a specific surface area of 916.10 m2/g, leading towards excellent CO2 adsorption (107.14 cm3/g at 0 °C). Furthermore, solid-state 29Si and 27Al magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectra were used to investigate the framework chemical coordination environment, while the temperature-programmed desorption of NH3 (NH3-TPD) and pyridine-Fourier transform infrared (Pyridine-FTIR) spectra were employed to quantitatively detect the acidity and types of acid sites of the sample. Finally, the thermocatalytic performance of the CFA-Y sample was analyzed in the conversion of cumene, with high silica commercial ultra-stable Y (USY) zeolite as a reference. The combined in situ microwave-ultrasound method highlighted in this work is expected to supply a novel route to efficient recycle and converse of CFA. ? 2022, The Authors. All rights reserved.