Study On Preparation Of Alumina Supported Nano-copper-based Sorbent And Its Efficiency Of Desulfurization

In order to improve the utilization of the active ingredient and desulfurizationactivity, reduce the cost and solve difficultion of sorbent regeneration, this studyintends to develop a kind of renewable supported nanometer copper-baseddesulfurizer with effective desulfurization and stable performance, which mayprovide technical parameters for industrial applications.In this paper, impregnation and coprecipitation method were adopted to preparealumina supported nano-copper-based desulfurizer. Desulfurization activity wastested by a fixed bed reactor with H2S target contaminants. The influence ofpreparation conditions on the desulfurization activity was investigated, and theoptimum conditions of preparation were determinined. The desulfurizers werecharacterized by XPS, XRD, TEM, BET, and TPR. The effect of structure, additives(Ce, Fe, Co, Zn) and stability of CuO/Al2O3on desulfurization activity werediscussed. The effects of regeneration atmosphere and regeneration temperature onregeneration performance of CuO/Al2O3were investigated, and multi-cyclesulfide/recycling experiments were carried out.The results show that desulfurizer prepared by coprecipitation method exhibitsbetter desulfurization activity, when coprecipitation agent is NaOH, calcinationtemperature of400℃, calcination time of3h, the loading ratio of CuO reached70%H2S, the breakthrough time is up to490min. Sulfur capacity is140mg g-1. WhenCerium was doped into CuO/Al2O3,the desulfurization activity and stability can befurther improved.Structure analysis shows the grain size of nano-copper oxide of CuO/Al2O3prepared by coprecipitation method far smaller than that obtained by impregnationmethod. Al2O3refine the grain size of nano-copper oxide. Characterization techniques (XPS, TG and XRD diffraction pattern) were used to analysisdesulfurization product of CuO/Al2O3. The results indicate that desulfurizationproducts were CuSO4and CuS.The regeneration performance of agent-doped samples Ce-CuO/Al2O3, Fe-CuO/Al2O3,Co-CuO/Al2O3, Zn-CuO/Al2O3were studied by thermal regenerationmethod in oxidizing and reducing atmosphere. Research shows that regenerationperformance of Ce-CuO/Al2O3(doped by Ce) in ammonia atmosphere is better thanoxygen atmosphere. Under NH3atmosphere, regeneration performance ofdesulfurizer is excellent at650℃. The regeneration can be carried out for four times.The total adsorption time is803min. The total sulfur capacity is up to229.4mg g-1.Regeneration performance of Zn-CuO/Al2O3(doped Zn element) in oxygenatmosphere is better than ammonia atmosphere. Under oxygen atmosphere,600℃is a proper temperature for regeneration of desulfurizer, and its regeneration can becarried out four times. The total adsorption time is755min. The total sulfur capacityis up to215.7mg g-1.