化工学报2024，Vol.75Issue(4)：1607-1615,9.DOI:10.11949/0438-1157.20231199
Y沸石中Cu(Ⅰ)的可控构筑及其乙烯/乙烷吸附分离性能研究
Controllable construction of Cu(Ⅰ)in Y zeolite for adsorptive separation of ethylene/ethane
摘要
Abstract
The similarity in the physical properties of ethylene(C2H4)and ethane(C2H6)makes their selective separation one of the most challenging chemical separation processes.Utilizing the π-complexation between Cu(Ⅰ)active species and C2H4,Cu(Ⅰ)-based adsorbents can achieve their selective separation,significantly reducing the cost and environmental impact resulting from the high energy consumption of traditional distillation processes.Cu(Ⅰ)-based adsorbents are prepared by reducing Cu(Ⅱ)-containing samples,but the uncontrollable Cu(Ⅱ)reduction,low Cu(Ⅰ)yields,and high energy consumption have been the obstacles to the application of Cu(Ⅰ)-based materials.Here,a selective reduction strategy has been successfully employed to selectively construct Cu(Ⅰ)active sites in Y zeolite,enabling the selective separation of C2H4/C2H6 under mild conditions.Using formaldehyde(HCHO)vapor diffusion transfer to react with Cu(Ⅱ)in zeolite,the selective construction of Cu(Ⅰ)at low temperature(140℃)was achieved.Compared to the original Cu(Ⅱ)Y,Cu(Ⅰ)Y exhibits excellent C2H4/C2H6 selective separation performance.Cu(Ⅰ)Y achieves a selectivity of 16.3,far higher than the selectivity of Cu(Ⅱ)of 3.2.Finally,the formation mechanism of Cu(Ⅱ)is revealed,in which Cu(Ⅱ)in the zeolite is selectively converted to Cu(Ⅰ)along with the production of CO2 and H2O.关键词
吸附/乙烯/乙烷分离/选择性/一价铜/选择性还原策略/沸石Key words
adsorption/ethylene/ethane separation/selectivity/Cu(Ⅰ)/selective reduction strategy/zeolite分类
化学化工引用本文复制引用
张凯博,沈佳新,李玉霞,谈朋,刘晓勤,孙林兵..Y沸石中Cu(Ⅰ)的可控构筑及其乙烯/乙烷吸附分离性能研究[J].化工学报,2024,75(4):1607-1615,9.基金项目
国家重点研发计划项目(2022YFB3806800) （2022YFB3806800）
国家杰出青年科学基金项目(22125804) （22125804）
