Synthesis And Properties Of An Inverse Opal SAPO-34 Zeolite

The pollution-free removal of nitrogen oxides,especially nitric oxide,is a focus of current concern.In particular,the fast development of motor,which has seriously hurt the quality of the atmosphere.However,the traditional processes such as SNCR and other methods have the disadvantages such as high energy consumption and high cost for the disposal of nitrogen oxides.Therefore,the SCR method has become a new method of nitrogen oxides treatment,and the new zeolite catalysts will effectively fit the SCR method.SAPO-34 zeolite is an important type in the zeolite.Common zeolite such as ZSM-5 zeolite,Y-zeolite,have the disadvantages of poor high temperature resistance and low catalytic efficiency,so it is necessary to find a high catalytic efficiency,high temperature resistance zeolite.Therefore,this topic uses SAPO-34 zeolite to treat nitrogen oxide pollution.In this experiment,Silica Solution,Phosphoric acid and Alumina were used as raw materials to synthesize classic SAPO-34 zeolite at a specific ratio.The resulting structure was verified by characterization analysis,and the influence of different initial raw materials on the synthesis of zeolites was analyzed.Although SAPO-34 zeolite is a relatively new type of zeolite,it also has disadvantages such as insufficient surface area and easy deposition of carbon.Therefore,a new structure-modified SAPO-34 zeolite has been proposed.Inverse opal structure is a kind of artificial synthesis of new structure,also known as multi-hole structure in the field of zeolite,can be used in environmental protection and other aera,it has a large aperture,strong permeability,with good adsorption and desorption of gas and the catalytic properties of nitrogen oxides and volatile organic compounds.Firstly,PS microspheres were synthesized by hydrothermal synthesis and the effects of different factors on the synthesis of Polystyrene microspheres were explored.A dense opal structure was synthesized by Polystyrene microsphere self-assembly method,and the effects of temperature and the like were investigated.It is proposed to use liquid phase reaction method to prepare SAPO-34 zeolites with inverse opal structure,and to confirm the new structure of SAPO-34 zeolites by means of characterization and other means.Through testing different synthesis methods,the optimal scheme for the synthesis of zeolites was found.Finally,the copper element was loaded on inverse opal zeolite by a certain load means.As a catalyst for nitrogen oxides,the copper ion loading rate was measured by ICP-OES,and then the purification of nitrogen oxides by this zeolite was measured by a reasonable gas catalysis experiment.The ability to finally obtain an inverse opal zeolite catalyst with both morphology and loading rate has achieved good results.