Rational fabrication of ordered porous solid strong bases by utilizing the inherent reducibility of metal-organic frameworks  

作　　者：Song-Song Peng Xiang-Bin Shao Yu-Xia Li Yao Jiang Chen Gu Manish Kumar Dinker Xiao-Qin Liu(✉) Lin-Bing Sun 

机构地区：[1]State Key Laboratory of Materials-Oriented Chemical Engineering,Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),College of Chemical Engineering,Nanjing Tech University,30 South Puzhu Road,Nanjing 211816,China

出　　处：《Nano Research》2022年第4期2905-2912,共8页纳米研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.21878149,22078155 and 21722606);National Science Fund for Distinguished Young Scholars(No.22125804);the Project of Priority Academic Program Development of Jiangsu Higher Education Institutions.

摘　　要：Ordered porous solid strong bases(OPSSBs)have attracted great research interest due to the excellent performance as heterogeneous catalysts in various reactions.The main obstacle for fabricating OPSSBs is the requirement of high temperature to produce strong basicity on ordered porous materials.For example,the temperatures of 600-650℃ are required for the decomposition of base precursor NaNO_(3)to basic sites on mesoporous silica SBA-15 and zeolite Y.Such high decomposition temperatures are energy-intensive and harmful to the structure of supports.Herein,we report the fabrication of OPSSBs by utilizing the redox interaction between base precursor and low-valence metal centers(e.g.,Cr^(3+))in metal-organic frameworks(MOFs).The base precursor NaNO_(3)on MIL-101(Cr)can be converted to basic sites entirely at 300℃,which is quite lower than those of the conventional thermal conversion on SBA-15 and zeolite Y(600-650℃).The exploration on decomposition mechanism reveals that the valence change of Cr^(3+)to Cr^(6+)takes place during the conversion of NaNO_(3)to basic sites.In this way,MOFs-derived base catalysts have been synthesized successfully by the host-guest redox strategy and exhibit high catalytic activity in typical base-catalyzed reactions.

关 键 词：metal-organic frameworks ordered porous solid strong bases host–guest redox interaction transesterification reaction Cr centers 

分 类 号：O64[理学—物理化学]