The Preparation Of The UTSA-16 With Regulating By Alkali Metal To Apply In CO₂ Conversion And CO Oxidation

Metal-Organic Frameworks（MOFs）with large specific surface area,high porosity,well-ordered pores and tunable pore,are regarded as functionalized material to be used for the adsorption and conversion of carbon dioxide.As the second highst adsorption capacity for CO₂,UTSA-16 possesses abundant microporous structure,and K⁺alkali cation in its channel to activate carbon dioxide.In addtion,it contains coordination unsaturated Lewis acid sites in the framework structure to activate epoxys.Therefore,UTSA-16 is an important catalyst for the conversion of carbon dioxide and epoxys to generate cyclic carbonates.Subsequently,we designed and synthesized a series of UTSA-16 by cation-exchanged,and studied the adsorption and conversion of CO₂.What’s more,the UTSA-16 with decorating by alkali metal was used as precursor in the air atmosphere to synthesize Co₃O₄ by alkali metal-regulatting,and are applied to carbon monoxide conversion.In the first part:UTSA-16 with micropore structure were synthesized refer to the literature,and it is used as matrix to synthesis M-UTSA-16 by ion exchange（M:Li,Na,K,Rb,Cs）.Its structure and properties are characterized through PXRD,TGA,ICP,BET.It was found that K-UTSA-16 has the highest adsorption capacity for carbon dioxide,and Li-UTSA-16 is catalyst with the highest catalytic activity and good stability in the conversion of carbon dioxide and epoxides to cyclic carbonates.In the second part:M@Co₃O₄（M:Li,Na,K,Rb,Cs）was prepared by M-UTSA-16 as a precursor to calcinate in a muffle furnace with an air atmosphere.The physical and chemical properties of M@Co₃O₄ are proved by the PXRD,H₂-TPR,O₂-TPD,ICP,BET,XPS and FI-RT.Finally,M@Co₃O₄ were applied to the catalytic oxidation of carbon monoxide,and Cs@Co₃O₄ is the best catalytic activities.It is attributed to the fact that Cs facilitates the breaking of the cobalt oxygen bond and releases oxygen from the lattice to accelerate catalytic activities.