Adsorption Removal Of Nitrogen Compounds From Diesel Oil Through Modification Of Activated Carbons

Existence of nitrogen compounds in transportation fuel s can not onlyseriously inhibit deep hydrode sulfurization,but also producedetrimental effect on human living conditions,since release of NOx intoair from combustion can cause acid rain．With increasing aw-earne s s ofNOx Pollution on human health and strengthened concern aboutultra-clean fuel s production,removal of nitrogen compounds is capturinggreat attention．Based on extensive review-of state--of--the--art denitrogenationmethod010gie s such as hydrodenitrogenatio,complexation extraction,acid／base refining,solvent extraction,biodenitrogenation,microw-ave-as sisted denitrogenation,and denitrogenation integration,adsorptive denitrogenation over carbon-based adsorbents was explored,for removing variou s nitrogen-containing compounds from model de seloil s．Modified with different acids and transition metal s,differentadsorbents have been prepared．(1)The re sults showed that sulfuric acid-pretreated carbonadsorbent impregnated with had better selectivity for basic nitrogencompounds．Nitrogen removal reached 90％at calcination temperature of110℃,adsorbent-to-oil ratio of 1:80 and ambient temperature．(2)The carbon-based adsorbent for nonbasic nitrogen compoundshad been prepared with metal components on the activated carbon．There sult show-ed that different metal ion s and different valence state s ofthe same metal on the actived carbon had appreciably different adsorptioncapacity for neutral nitrogen compounds．The adsorbent with trivalentstate iron had a relatively higher adsorption capacity of around34 07mg／g． (3)The acid and metal-Carbon adsorbent showed a high selectivityon the nitrogen-Containing Compounds．It can effectively remove basicand nonbasic nitrogen compOunds at ambient temperature,adsorbent tooil ratio of 1:400 and adsorption time 40 min．Spented adsorbent Can beregenerated through organic SOlvent washing．(4)The mechani sm for adsorptive removal of nitrogen compoundshad been explored via Quantum MechaniC S,M01ecular Mechanic S andMonte Carlo method．The metal adsorbent may have three functionalways to react with nitrogen Compounds．It mainly forms acid-basecompounds by Combining the lone-Pair electrons on the N atoms withvacant S orbit of the Fe atom．While adsorbing nonbasiC nitrogencompounds the electrons of the d orbit on the Fe atom combine withvacantπorbit of the containing N ring．...