Preparation & Study On Pillared Montmorillonites Catalysts For Selectively Catalytic Reduction Of NOx By Hydrocarbons In The Presence Of Oxygen

With the development of automobile engine technology and in consideration of energy saving and environment preserving, more and more attention was paid to the lean-burn automobile technology, which has the advantage of energy and economy. The traditional three-way catalyst would be ineffective under lean-burn condition, thus the development of the new types of catalysts that can work in the presence excess oxygen is one of cruxes whether can use of lean-burn engine or not. Pillared clays are unique dimensional zeolites-like materials which are show to exhibit a great potential in diverse application, such as oil cracking and refinery, environmental processes.In this thesis, zirconiun pillared montmorillonite(Zr-PILM), aluminium pillared montmorillonite (Al-PILM) and aluminium and cerium pillared montmorillonite (AlCe-PILM) were prepared by using natrium montmorillonite (Na-M) as matrix, and then the catalysts were prepared by cation exchanged or impregnated with Cu2+, Fe3+ and Ag+and used for the selective catalytic reduction NOx using propylene as the reducing agent. The influence of preparation conditions on catalytic activity is studied and the structure of the catalysts have been investigated by using XRD^ DTA, IR and so on. The results is showed as follows: (1). Tthe catalyst modified by SO/' can remarkably increased the NO conversion compared the catalyst which didn' t modify by SO/" or NK,NO;i. (2). AlCe-PILM has higher thermal stability than Zr-PILM and Al-PILM, and the catalyst prepared by AlCe-PILM activity is still able to obtain NO conversion 20. 34% at 600癈, it is higher than that prepared by Zr-PILM or Al-PILM.(3).The La/Cu/ S0427AlCe-PILM catalyst can increase the highest NO conversion from 49. 11% to 57. 22%and keep 19. 53% at 650癈 while 1. Owt% of LaA doping on Cu/ SO/"/AlCe-PILM and calcination at 500.