بررسي مقايسه اي ظرفيت جاذبهاي اكسيد مس آمورف بر پايه آلومينا و جاذبهاي ساختار يافته SBA15 بر پايه سيليكا در حذف SO2 از مخلوط گازها

چكيده انگليسي :

84 A Performance Comparison Between Amorphous Copper Oxide on Alumina Based and Structured SBA 15 on Silica Based Adsorbents for Removal of SO2 from Gas Mixture Hosein Abdollahi Kharaji h abdollahikharaji@ce iut ac ir April 29 2013 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Mohamad Reza Ehsani ehsanimr@cc iut ac irAbstractIn recent years a great deal of attention has been given to the problem of reducing the level of atmosphericpollution caused by sulfur dioxide emission One of the methods receiving much attention in recent yearshas been the sorptionor reaction of SO2 with dry regenerable solid sorbents notably metal oxides These dryregenerative processes for flue gas desulfurization offer a number of advantages over the established otherprocesses which include no solid liquid waste generated salable sulfur by product and also reheating ofthe flue gas after SO2 removal process is not required and water requirements are minimal since wetmaterials are not handled The dry sorbents usually consist of a metal oxide Metal oxides are widely usedas sorbents to remove SO2 from hot gases produced by gasification processes CuO Al 2O3 and CuO SBA 15are capable of removing SO2 from flue gas simultaneously at around 350 600 C In this study CuO onalumina and SBA 15 type sorbents were prepared by the wet impregnation method in which copper isactive support material respectively The copper loading in the amorphous sorbents was varied from 11 to17wt CuO and for Structured sorbents from 20 to 25 CuO During the SO2 removal CuO reacts withSO2 in the presence of O2 to form CuSO4 while some of the alumina may also react with SO 2 to formAl2 SO4 3 Upon saturation of the CuO Al2O3 by SO2 it subjects to a regeneration treatment to convertCuSO4 back to CuO and gaseous SO2 by a reducing gas such as H2 or CH4 The released SO2 can be thenprocessed to either produce sulfuric acid through oxidization or elementary sulfur All these processes needadditional reactors and most of them need catalysts Our preliminary research shows that the regeneration ofThe regeneration experiment temperatures was 450 C After the SO2 removal the SO2 adsorbed CuO Al2O3needs to be treated to regenerate its SO2 removal capacity and to recover the removed sulfur The sol gel derived copper oxide coated alumina granules with a surface area of 252 274 m2 g pore volume of 0 41 0 57 cm3 g and Pore diameter of 6 6 2 nm For Structured sorbents surface area is 624 682 m2 g Thehighest sorbent capacity was achieved with sorbent with copper content of 15 for amorphous and 22 forStructured sorbents The SO2 removal characteristics of the samples were investigated by using a laboratoryscale fixed bed reactor The critical sorption requirement depends upon the desired level of SO 2 removal The spent sorbent is recycled to the regenerator which is maintained at a temperature 450 C SO2concentration for reactor inlet is 5000 ppm Here the sulfated sorbent was contacted with a reducing gassuch as CH4 Keywords 1 Desulfurization 2 Removal of sulfur dioxide 3 Absorbentstructure 4 CuO Al2O3

عبدالهي خراجي، حسين

بررسي مقايسه اي ظرفيت جاذبهاي اكسيد مس آمورف بر پايه آلومينا و جاذبهاي ساختار يافته SBA15 بر پايه سيليكا در حذف SO2 از مخلوط گازها

گوگرد زدايي , CuO/Al2O3