无机材料学报2023，Vol.38Issue(12)：1379-1386,中插1-中插2,10.DOI:10.15541/jim20230224
Cu/Mg比对Cu/Mg-MOF-74的CO2吸附性能的影响
Effect of Cu/Mg Ratio on CO2 Adsorption Performance of Cu/Mg-MOF-74
摘要
Abstract
Cu/Mg-MOF-74 has several advantages,such as high specific surface area,adjustable microporous structure,alkali metal active site,excellent CO2 adsorption,and good photocatalytic activity.However,how the molar ratio of Cu/Mg(Cu/Mg ratio)affects its CO2 adsorption selectivity in a simulated flue gas is still unclear.Here,a synthesized Cu/Mg-MOF-74,with series of Cu/Mg ratios,using the solvothermal method was analyzed about its CO2 photocatalytic performance,CO2 and N2 uptake,and pore structure.The CO2 adsorption selectivity was calculated to reveal the effect of Cu/Mg ratio on CO2 and N2 uptake and selectivity.The results indicate that the photocatalytic activity of Cu/Mg-MOF-74 for CO2 reduction to CO and H2 initially increases and then decreases with Cu/Mg ratio decreasing.At the Cu/Mg ratio of 0.6/0.4,the yield of CO and H2 by photocatalytic reduction is the highest,showing up to 10.65 and 5.41 μmol·h-1·gcat-1(1 MPa,150℃),respectively.Furthermore,CO2 and N2 uptakes of Cu/Mg-MOF-74 increase as the Cu/Mg ratio decreases,and the increase in CO2 uptake is more pronounced.At the Cu/Mg ratio of 0.1/0.9,the CO2 and N2 uptakes are the largest,reaching 9.21 and 1.49 mmol·g-1(273.15 K,100 kPa),respectively.Their area and volume of micropore(d1≥0.7 nm)and ultramicropore(d2<0.7 nm)increase as the Cu/Mg ratio decreases.At the Cu/Mg ratio of 0.22/0.78,the area and volume of micropores and ultramicropores are larger than those of Mg-MOF-74.The selectivity of Cu/Mg-MOF-74 increases correspondingly with Cu/Mg ratio decreasing and CO2 concentration increasing.CO2 adsorption on Cu/Mg-MOF-74 is a combination process of pore-filling and Mg2+ chemical adsorption in which the micropore volume is the key factor affecting its adsorption performance.All above data demonstrate that modulating the Cu/Mg ratio can promisingly regulate the pore structure of Cu/Mg-MOF-74,CO2 uptake,and selectivity.关键词
Cu/Mg-MOF-74/CO2/吸附/选择性/孔结构/光催化Key words
Cu/Mg-MOF-74/CO2/adsorption/selectivity/pore structure/photocatalysis分类
化学化工引用本文复制引用
凌洁,周安宁,王文珍,贾忻宇,马梦丹..Cu/Mg比对Cu/Mg-MOF-74的CO2吸附性能的影响[J].无机材料学报,2023,38(12):1379-1386,中插1-中插2,10.基金项目
国家自然科学基金(51674194) （51674194）
陕西高校青年杰出人才支持计划 （）
陕西省自然科学基础研究计划(2021JQ-886)National Natural Science Foundation of China(51674194) （2021JQ-886）
Youth Talents Support Plan of Shaanxi （）
Natural Science Basic Research Program of Shaanxi(2021JQ-886) （2021JQ-886）
