文献类型：期刊文献

英文题名：Synthesis and catalytic performance of Linde-type A zeolite (LTA) from coal fly ash utilizing microwave and ultrasound collaborative activation method

作者：Chen, Wenting Song, Guoqiang Lin, Youyuan Qiao, Jintao Wu, Tonghua Yi, Xingyuan Kawi, Sibudjing

第一作者：Chen, Wenting

通信作者：Song, GQ[1];Kawi, S[2]

机构：[1]Jiangxi Normal Univ, Coll Chem & Chem Engn, 99st Ziyang Ave, Nanchang 330022, Jiangxi, Peoples R China;[2]Guizhou Inst Technol, Sch Chem Engn, 1 st Caiguan Rd, Guiyang 550003, Guizhou, Peoples R China;[3]Guizhou JiRuiYuan Ind Co Ltd, Faer Ind Pk, Liupanshui 553017, Guizhou, Peoples R China;[4]Guizhou ShiXin Basalt Technol Co Ltd, Basalt Sci & Technol Ind Pk, Liupanshui 553017, Guizhou, Peoples R China;[5]Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 117585, Singapore

第一机构：Jiangxi Normal Univ, Coll Chem & Chem Engn, 99st Ziyang Ave, Nanchang 330022, Jiangxi, Peoples R China

通信机构：corresponding author), Guizhou Inst Technol, Sch Chem Engn, 1 st Caiguan Rd, Guiyang 550003, Guizhou, Peoples R China;corresponding author), Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 117585, Singapore.|贵州理工学院化学工程学院;贵州理工学院;

年份：2022

卷号：397

起止页码：407-418

外文期刊名：CATALYSIS TODAY

收录：;EI(收录号：20213210743040);Scopus(收录号：2-s2.0-85111989388);WOS:【SCI-EXPANDED(收录号:WOS:000810424800005)】；

基金：This work was supported by the National Natural Science Foundation of China (22062003) , the Natural Science Foundation of Guizhou ( [2019] 2872 and [2020] 1Y037) , Youth Science and Technology Talent Growth Project of Guizhou Provincial Education Department (Qian-JiaoHe KY [2021] 253) , Science and Technology Supporting Foundation of Liupanshui (52020-2018-01-04, H2020-003) and Natural Science Foundation of Guizhou Institute of Technology (XJGC20190902) .

语种：英文

外文关键词：Coal fly ash; Linde-type A zeolite; Microwave-ultrasound; Collaborative activation; CO(2 )adsorption; Catalytic cracking

摘要：Pure LTA zeolites of high crystallinity have been synthesized from coal fly ash (CFA) by utilizing a method of microwave and ultrasound collaborative activation (MUCA) in situ for the first time. Compared to the activation method of only microwave or ultrasound, the MUCA have more efficient ability to dissolve silica-aluminum species from CFA while avoiding the digestion of other impurities, greatly reduced the energy consumption. While the liquid-solid ratio (LSR) of sodium hydroxide solution to CFA was 10 mL/g, the molar conversion rates of silicon and aluminum were 70.26% and 68.03%, respectively. Furthermore, with different LSR, pure LTA zeolite could be synthesized by adjusting the ratio of Si/Al. The CFA used in this paper contains Fe2O3 of about 12 wt percentage, and there have found almost no element of iron existing in the LTA zeolite products, indicating that the method of MUCA is suitable for the preparation of high purity zeolite. Finally, according to the mechanism of crystallization-dissolution-recrystallization, the morphology of LTA products could be well tuned by adjusting parameters such as LSR or crystallization time. The maximum BET surface area was 474 m(2)/g without additional calcium ion exchange steps by direct using of municipal water instead of deionized water, and the maximum CO(2 )adsorption capacity was 1.96 mol/g under 0 ?. The mesoporous LTA zeolite also have been prepared just through the adjustment of crystallization time without addition of any other templates, the intramesopores of about 17 nm made greatly improvement in catalytic cracking of 1,3,5-tri-isopropylbenzene which is inaccessible to the conventional LTA micropores, and the conversion rate of 1,3,5-tri-isopropylbenzene reached to 25.40% as well as 11.05% of the selectivity of secondary cracking product benzene.