Preparation,Characterization And Catalytic Performance Of Supported Metal Three-dimensional Ordered Macroporous Materials

In recent years,Nitrogen oxides(NOx,x=1 or 2),which are mainly emittedfrom fossil fuel combustion and automobiles,are major hazardous gases for air pollution and human health.Ammonia selective catalytic reduction of NOx to N2 and H2O has been successfully developed and commercialized as the most effective flue gas cleaning technology for stationary sources due to its high-efficiency of NOx conversion.So far,vanadium-based catalysts,which have exhibited high catalytic activity,selectivity,and SO2 tolerance within the narrow temperature window of 300-400℃,are widely used commercial catalysts for the ammonia selective catalytic reduction(NH3-SCR)of NOx.However,the temperature ofter flue gas after the desulfurizer and particulate removal device is generally below 200℃.Therefore,it is highly desirable to design and fabricate new low-temperature catalysts for the NH3-SCR of NOx.The evaporation self-assembly method synthesized polymethyl methacrylate(PMMA)colloidal crystal template.We successfully prepared MnOx nanoparticles supported by three-dimensionally ordered macroporous carbon(MnOx/3DOMC)composite catalyst with PMMA as template,the PF sol,F127 and Mn(NO3)2 were manganese precursor solution.Several techniques,including scanning electron microscopy(SEM),X-ray diffraction(XRD),N2-sorption,transmission electron(TEM)microscopy,are employed tocharacterize the MnOx/3DOMC nanocomposite.The results demonstrate that MnOx/3DOMC possessesa highly ordered macroporous structure with hierarchical mesopores in the walls of the macroporous skeleton.and its use as a catalyst for low-temperature SCR of NOx with NH3.A novel 3DHPC-supported Pt catalyst(Pt/3DHPC)were obtained by filling the void of the colloidal PMMA templates with R-F resol solution containing H2PtC16·6H2O.Several techniques,including N2-sorption,SEM,XRD,the 3DHPCs are expected to combined the advantages of each pore size regime.Particularly in catalysis used as catalyst supports,in addition to the aforementioned characteristics of carbon materials,the 3DHPCs not only possess nanometer-sized mesopores supplying larger surface areas for more active component nucleation and growth and thus leading to higher activities and better-controlled selectivities,but also provide mechanically and thermally stabilized macropores to facilitate the mass transportation of the reactant and the product molecules.As the catalyst of the selective liquid-phase hydrogenation of cinnamaldehyde(CMA),the Pt/3DHPC exhibited an excellent CMA conversion and a high cinnamyl alcohol selectivity.