Assembly And Catalytic Performance Of New Zn-based Metal Organic Frameworks And UiO-67 Encapsulating Pt-Pd/Pt Nanoparticles

Metal-organic frameworks(MOFs)are a new class of porous materials which can be applied to many fields,such as gas separation,drug delivery and catalysis,due to their adjustable pore size,large specific surface area and structure diversities.In this paper,EDA and NIA have been used to coordinate with Zn ion to offer Zn(NIA)(EDA(1Zn).What' s more,3-bpd and CHDC are also applied to synthesize[Zn(CHDC)2(3-bpd)1.5]n(2Zn)with Zn ion through slow diffusion method.The structure of 1Zn is one-dimensional extended chains,while 2Zn exhibited a three-dimensional network structure.Influences of temperature,solvent and surfactants on the mophorlogies of 1Zn and 2Zn are examined.In this study,The catalytic performance of 1Zn and 2Zn were investigated.The results indicated that both 1Zn and 2Zn expressed excellent conversion over the Knoevenagel condensation reaction,And 1Zn exhibited excellent catalytic behavior and selectivity to malachite green in the degradation of organic dyes in aqueous solution.UiO-67 was selected as base and Pt and Pt-Pd nanoparticls were taken as cores to offer two mono-dispersed core-shell catalysts M@UiO-67(M=Pt-Pd,Pt),and Pt@UiO-67 beared a hollow structure.The mophorlogies of these two catalysts were modulated by acetic acid,PVP and the amount of metallic nanoparticles.Reverse water gas shift reaction(RWGS)was chosen to evaluate the catalytic activity of as-synthesized catalysts.It turned out that the selectivity and conversion towards RWGS reaction are relatively high.What' s more,Pt@UiO-67 exhibitd a higher CO2 conversion of 45%when compared with Pt-Pd@UiO-67,owing to active sites offerd by hollow structure.These developed strategies of these assembled composites will certainly enhance new potential applications of MOFs.