Microwave Desulfurization Behavior Of Activated Carbon Supported Iron Oxide High Temperature Coal Gas Desulfurization Sorbent

With the rapid development of the world economy,the energy crisis is imminent.Many countries around the world are actively seeking new energy or new technologies to change the existing energy structure.However the storage of oil and natural gas reserves in china are not rich,there being a very rich coal.But,most of China's coal resources are burned directly to generate electricity,which not only lead to lower utilization and also serious pollution of the environment.Therefore,this requires us to develop high utilization of coal clean use technology.And IGCC polygeneration technology and IGFC-CC has become the most promising coal clean use technology.However,removing H₂ S is the core of the coal clean use technology.In this paper,a wide range of iron oxide from the source is used as the active component of the desulfurizer.Activated carbon with good microwave absorbing performance is used as the carrier.After activated carbon was modified by a certain concentration of nitric acid solution,the activated carbon supported iron oxide desulfurizer?Fe₂O₃/AC?was synthesized by equal volume impregnation method,and the conventional desulfurization and microwave desulfurization experiments were carried out on a fixed bed.In the conventional and microwave desulfurization experiments,the effects of the loading of the active components and the desulfurization temperature on the desulfurization performance of Fe₂O₃/AC desulfurizer were analyzed.N2 adsorption,XRD,XPS,and SEM techniques were used to characterize the structure of sorbents before and after desulfurization.In addition,the desulfurization behavior,crystal structure,surface and internal elements or ion distribution of the desulfurization at different vulcanization temperatures were compared,and the vulcanization kinetics of the desulfurizer were studied.The effect of microwave on the surface vulcanization reaction and the solid ion diffusion of the vulcanization reaction product layer was discussed from the perspective of kinetics.And draw the following conclusions:?1?With the commercial activated carbon as the carrier,the specific surface area and pore volume of the Fe₂O₃/AC desulfurizer synthesized by the equal volume impregnation method are larger.And Fe₂O₃ is uniformly dispersed on the surface of commercial activated carbon.?2?In the conventional and microwave desulfurization experiments,it is found that the activated carbon alone has the ability to adsorb H₂ S,the sulfur capacity is 1.496% and 2.670% respectively.And activated carbon and iron oxide may exist a synergistic effect to promote the desulfurization agent to remove H₂ S.Considering the synergistic effect and the sulfur capacity and sulfur capacity of the desulfurizer,the optimum desulfurization conditions for the conventional and microwave desulfurization are load 10% and the desulfurization temperature is 600?.The sulfur capacity is 10.85% and 15.70% respectively.?3?Several advantages of microwave sulfidation over conventional way are as follows: much better performance of Fe₂O₃/AC sorbents,less decline in surface area and pore volume per unit sulfur capacity when removing H₂ S at 400?,500? and 600?,and more S2-and oxygen vacancies species on the surface of used desulfurizers.The activation energies of conventional and microwave desulfurization reactions were 24.6 and 24.1kJ·mol-1 by calculating the vulcanization kinetics of the total desulfurization reaction of Fe₂O₃/AC adsorbents.Compared to conventional desulfurization,there is no notable decrease in apparent activation energy of overall sulfidation reaction by microwave way.The enhancement of desulfurization rate may be due to quicker ion diffusions and/or better mass transfer under microwave conditions.