Co-mo Desulfurization Catalyst Loaded On Hollow Micro-spheres Of Alumina With Honeycomb Structure

Coal, as the major source of energy in our country, produces a large number of SO2 after combustion, and its emission reaches the first in the world. The pollution of SO2 has become a difficult problem, yet there is no good solution. Wet desulphurization is currently the main method, but this produces a large number of secondary pollution. Therefore, dry desulfurization has been raised in recent years, and one of this method is to direct catalytic reduction of SO2 to sulfur element. This not only avoids secondary pollution, but also obtains sulfur which is valuable resource. In the coal-fired process, incomplete combustion will produce hazardous CO. If using CO as reducing agent, while it removes SO2, it also reduces CO pollution. But in the process of gas catalytic reduction, the reaction temperature is high, and the catalyst deactivation is easy to happen. So in this article we studied the desulfurization catalyst in terms of the carrier and the preparation. The following are the main conclusions:1.It was studied over the impact of preparation conditions of colloidal glucose carbon spheres on the properties of alumina carrier. And it was concluded that the hydrothermal synthesizing temperature and time of colloidal carbon spheres, the washing after synthesis had lager impact on the carrier properties. The colloidal carbon ball with 180℃temperature and 6 h reaction time were selected as template. Through orthogonal experiment to optimize the preparation conditions and the tests on surface area, pore structure, XRD, and SEM of the carrier, we got the hollow micro-spheres of alumina with honeycomb structure carrier with larger surface area, two structure pores of small pores and transition pores and uniform morphology.2.The catalyst preparation conditions was screened according to the sulfur dioxide removal rate. The cobalt and molybdenum catalyst were produced by firstly impregnated with cobalt and then with molybdenum, their concentrations were 4% and 14% respectively. When the active component's impregnation time was 4h and the calcination temperature was 550℃, the catalyst had the best activity and its desulfurization rate could reach 92.3%. Through 42h's continuous operation it still had high active performance. This may be the important reason of the particular hollow structure having good stability.3.Reduction desulfurization mechanism on cobalt and molybdenum catalyst loaded on hollow micro-spheres of alumina with honeycomb structure and the reaction kinetics were researched,the kinetic equation was finally obtained: RSO2 = 6.7×104·exp(-1.669×104/RT)·CSO2·CCO...