Preparation Of Supported UiO-66-SO₃H-NH₂ Catalysts And Their Catalytic Performance Study

Facing the dual pressures of traditional fossil energy consumption and environmental pollution.For the direction of future energy development,it is urgent to develop a green renewable energy.Owing to biomass rich reserves,low cost and availability,Biomass have widely concerned by countries.Among them,5-hydroxymethylfurfural?HMF?is widely research from carbohydrate biomass.As a biomass-based platform product,HMF can be derivatived many chemicals through a series of chemical reactions.Therefore,HMF is regarded as one of the most valuable high value-added chemicals.At present,the chemical catalytic have widely used for the catalytic conversion of biomass resources.It is a core task of constructing catalytic system that to increasing the catalytic activity and is the key to obtain high yield of HMF.Duing to the lare specific surface area,low density,low corrosion to equipment,and easy separation,as a ideal catalyst,the solid catalyst has been applicated in conversion of biomass.Metal Organic Frameworks?MOFs?have the advantages of adjustable structure and design of catalytic sites and are widely used in catalysis,adsorption and other fields.However,it is still a challenge that to improve the stability and catalytic activity of MOFs in catalytic reactions for the field of catalysis.Therefore,in this paper,a series of porous solid catalysts have been successfully synthesized through using natural halloysite nanotubes?HNTs?,graphene oxide?GO?and easily separable bulk polyurethane foam?PU?as carriers.Their physicochemical properties such as morphological characteristic,structure,and acid-base intensity were characterized by systematic characterization methods.The catalytic properties of porous solid catalysts were explored by catalytic convert fructose and glucose into HMF.Detailed contents are summarized as follows:?1?HNTs supported UiO-66-SO₃H porous solid catalyst for conversion of fructose into HMFFirstly,HNTs were modified to graft polyvinylpyrrolidone?PVP?.Subsequently,PVP-HNTs@UiO-66-SO₃H-X?X=0.5,1,2,3?was successfully synthesized by solvothermal method.The acidity of the porous solid acid is effectively regulated by adjusting the loading amount of MOFs.The catalyst was used to the conversion of fructose to HMF.Under optimal conditions,the obtained HMF yield 92.4%.At the same time,the recyclability of the catalyst is also discussed.?2?GO supported UiO-66-SO₃H-NH₂ acid-base multifunctional porous solid catalyst for conversion of fructose into HMFFirstly,grapheme oxide?GO?was prepared by Hummer method.Subsequently,GO was modified to graft polydopamine?PDA?.Finally,at atmospheric conditions,a multi-functional porous solid catalyst UiO-66-SO₃H-NH₂/PDA@GO was synthesized in green solvent by hydrothermal method.Through adjusting the loading amount of MOFs to fabricate a series of porous catalysts.Bying catalytic converting glucose to HMF to investigate the catalytic activity of the catalyst.Under the optimal catalytic conditions of conversion glucose the HMF yield was 85.3%.Finally,the regenerative capacity of the catalyst was explored through cycling experiments.?3?PU supported UiO-66-SO₃H-NH₂ acid-base multifunctional porous solid catalyst for conversion of fructose into HMFFirstly,Polyurethane foam?PU?were modified to graft polydopamine?PDA?.Subsequently,the porous solid catalyst UiO-66-SO₃H-NH₂/PDA@PU was fabricated by one-step hydrothermal method.At the same time,By adjusting the ration of organic ligands,to achieve the adjustment of the acidity and alkalinity of the catalyst.The catalyst was used to catalyze the conversion of glucose to HMF.Under optimal catalytic conditions,the yield of HMF was 83.1%.Finally,the recycling performance of the catalyst was explored through a cyclic experiment.