超声浸渍法制备高温煤气脱硫剂及其表征和活性研究

Preparation of Sorbents for Hot-gas Desulfurization by Ultrasonic Impregnation and Its Characterization and Desulfurization Activity

应用超声浸渍法和普通浸渍法分别制备Fe、Mn、Cu、Ce、Ca和Zn6种金属物系的高温煤气脱硫剂,并采用等离子体发射光谱、扫描电镜(SEM)和X射线衍射仪(XRD)对脱硫剂进行表征,在固定床上进行脱硫剂的活性测试。研究结果表明,超声浸渍促进活性成分的负载,丰富脱硫剂的孔隙结构,并具有细化和均化颗粒的效果。SEM结果显示,超声浸渍制备得到的脱硫剂颗粒较小而且分布均匀,烧结程度较轻。XRD分析表明超声浸渍对脱硫剂的晶粒分布状态有影响。活性测试结果表明,超声浸渍制备得到的脱硫剂活性有大幅度的提高,特别是铁系脱硫剂。几种物系脱硫剂在相同超声条件下制备得到的脱硫剂的活性比较结果为:Fe>Mn>Cu>Ce>Ca>Zn。

Six hot-gas desulfurization metal sorbents including Fe, Mn, Cu, Ce, Ca and Zn were prepared by an ultrasound-assisted impregnation method and by a classical impregnation method. The desulfurization activity of the high temperature desulfurization sorbents was studied in a fixed-bed reactor. The physical and chemical properties of the sorbents were analyzed by means of inductively coupled plasma atomic emission spectrometry（ICP-AES）, Scanning Electron Microscope （SEM）, and X-ray diffraction （XRD）. The results showed that the use of ultrasond increased the content of active ingredient in the sorbents, improved the pore structure, and thinned the particles. SEM results revealed that the sorbents was small in granule, uniform grading and less sintering with ultrasonic treatment. XRD results showed that the use of ultrasond had an affect on the dispersion of crystal grain. The activity test results indicated that the desulfurization activity of the sorbents prepared by ultrasound impregnation was much higher than those without ultrasonic treatment, especially for the Fe sorbent. The desulfurization activity order of the six metal sorbents is Fe〉Mn〉Cu〉Ce〉Ca〉Zn.