Preparation Of Cu/SAPO-34 And Cu/SSZ-13 Catalysts And Selective Catalytic Reduction Of Nitric Oxide (NO)

Ammonia selective catalytic reduction(NH3-SCR)is the most widely studied and effective method for the removal of nitric oxide,(NO)in flue gas at home and abroad.The key of this technology is to develop catalysts with excellent performance.Cu/SAPO-34 and Cu/SSZ-13 catalysts have significant advantages in catalytic efficiency,active temperature window,hydrothermal stability,etc.,compared with the earlier studies on vanadium,noble metals,metal oxides and other molecular sieve catalysts,Which has become a hotspot in the development of new NH3-SCR catalysts.In this paper,Cu/APO-34 and Cu/SSZ-13 catalysts were prepared by a one-step hydrothermal synthesis using a novel copper amine complex as a template.The effect of conditions such as copper salt,template,hydrothermal temperature and time on Cu/APO-34 and Cu/SSZ-13 catalysts activity were investigated.The morphology,structure,composition and specific surface area of Cu/SAPO-34 and Cu/SSZ-13 catalysts were analyzed and characterized by SEM,XRD,XPS and N2 adsorption techniques.The properties and process conditions preparations of Cu/SAPO-34 and Cu/SSZ-13 catalysts were optimized.In the process of Cu/SAPO-34 catalyst preparation,the types of copper salt influences the width of catalyst activity temperature window.The active temperature window of the catalyst prepared by copper sulfate is the widest,reaching 150-550?,with good water thermal stability.Template agent determine the formation of Cu/SAPO-34 catalyst and the size of the specific surface area.When four ethylene five amine is used as the template,the crystal structure of the catalyst is complete.The specific surface area reached 250.289 m2/g,with good catalytic activity.Hydrothermal temperature has a great influence on the Cu/SAPO-34 catalyst in the crystallinity.Low hydrothermal temperature(below 150?)cannot synthesize quartet crystals structure of Cu/SAPO-34 catalyst,while high temperature(above 150?),would destroy the crystal structure.7 days of hydrothermal time can ensure the formation of a complete crystal structure of Cu/SAPO-34 catalyst.In the process of Cu/SSZ-13 catalyst preparation,the types of copper salt influences the width of catalyst activity temperature window.The active temperature window of the catalyst prepared by copper sulfate is the widest,reaching 150-450?,with good water thermal stability.Template agent determine the formation of Cu/SSZ-13 catalyst and the size of the specific surface area.When four ethylene five amine is used as the template,the crystal structure of the catalyst is complete.The specific surface area reached 124.610 m2/g,with good catalytic activity.When hydrothermal temperature reaches 150?,cube crystal structure that is not damaged of Cu/SSZ-13 catalyst is formed.6 days of hydrothermal time can ensure the formation of a complete crystal structure of Cu/SSZ-13 catalyst.