Synthesis And Catalytic Properties Of Micro-mesoporous Materials Based On Ionic Liquid

Mesoporous materials are the pore size in range of 2～50 nm,the regular mesoporous channel,high internal surface area,bigger pore volume and adjustable composition,etc.For larger molecules alkylation,isomerization catalysis reaction provides the ideal place.However,the material of the mesoporous channel composed of amorphous hole wall,the lower thermal stability and some other weaknesses such as active center is not lively,and greatly affect its wide application in the field of catalysis.Although higher hydrothermal stability of microporous materials,but the smaller pore size,limited the macromolecular reaction into inner material,reducing the catalytic reactivity.In comparison,micro-mesoporous materials show two pore size distribution,large pore size and highly specific surface area for mesoporous meterials,strongly acidic and highly stability for microporous materials.So microporous materials are widely used in catalysis,adsorption and separation field.At the same time,the pure silicon micro-mesoporous materials due to the lack of corresponding heteroatomic active component,is not conducive to the subsequent catalytic reaction.Zirconium doped,can not only embedded impurity atoms in the surface or inside structure of the silicon material,and can be further regulation of acid and channel structure,and help to enhance the activity of catalytic reaction and stability.1,2-Diphenylethane(PXE)is an appropriate solvent for the pressure-sensitive record materials,and can be obtained by the alkylation of o-xylene with styrene.The porous silica materials were synthesized with P123 and PIL as the co-templates by the hydrothermal method.Moreover,The silica-zirconium material acidized and acid catalyst was obtained.The catalytic properties of the catalysts were assessed in the alkylation of o-xylene with styrene.The micro/mesoporous silica materials were synthesized by the hydrothermal method using ionic liquid(triethylamine acetate)as the microporous template and P123 as the mesoporous template.The influence of the mass ratio of PIL to co-templates(X)and the pH of the solution(Y)during synthesis were investigated.The results showed that the materials with different structure were obtained under the different pH.With the lower protic ionic liquid,the structure of the micro-mesoporous more ordered,and with the increase of the amount of protic ionic liquid,the orderly structure was destroyed.In the alkylation reaction,the materials acidized by H2SO4 solution,NTA-30-2-SO42-shows higher catalytic properties,the yield of PXE was more than 80%,This may be related to the materials with microporous structure.A series of micro/mesoporous silica-zirconium materials with ordered micro-mesopores have been successfully fabricated using P123 and protic ionic liquid as co-templates.And the influence of Si/Zr and calcined temperature to the structure of the final materials has been investigated systematically.The results shows that when Si/Zr=10,the materials not only keep the regular pore structure,but also has higher specific surface areas.The materials SZ-10 calcined after 700 ℃,the material still has the regular of channel structure and the acid increased.In the alkylation reaction,showed higher catalytic activity,the yield of PXE was about 87.8%,this may be due to the unique structure of micro-mesoporous material.A series of micro/mesoporous silica spheres with radially oriented mesoporous have been obtained by using CTAB and protic ionic liquid as co-templates.The influence of the mass ratio of PIL to co-templates during synthesis were investigated.The results show that with the lower protic ionic liquid,the pore size of the radially silica spheres increased,with the PIL content increased,the ordered channels were destroyed.In the alkylation reaction,HPW supported on radially mesoporous silica spheres were prepared by impregnation method,and compared with the traditional catalyst HPW/SBA-15,the catalyst with the radially oriented mesoporous as the supports showed the higher activity.Above all,the micro/mesoporous silica-zirconium materials using surfactant and protic ionic liquid as co-templates possess high surface area,large pore size,and special pore channels.And these materials with advanced properties would act as significant roles in the alkylation.