【摘要】 以硝酸铁、硝酸锌、氨水及黏结剂为主要原料,用共沉淀法制成六种铁酸锌脱硫剂。研究了各种黏结剂的加入对脱硫剂的尖晶石结构、硫容量和脱硫效果的影响,在固定床上对其进行脱硫试验。并用X射线衍射(XRD)、扫描电子显微镜(SEM)和气体吸附等测试手段,对脱硫剂的物相组成、结构、比表面积和孔容进行了表征。结果表明,用共沉淀法制备的铁酸锌,具有不受黏结剂影响的尖晶石结构,其颗粒属于微米级;添加高岭土黏结剂的脱硫剂的脱硫效果最好,添加硅藻土的脱硫剂的脱硫效果最差;不同黏结剂对脱硫剂的织构的影响不同;脱硫剂的反应活性和硫容量与其孔容的大小有关。更多还原

【Abstract】 Using ferric nitrate, zinc nitrate, ammonia liquor and binder as main starting materials, 6 zinc ferrite sorbents were prepared by co-precipitation method. The effect of binder on the spinel structure, sulfur capacity and desulfurization property of the sorbents were investigated. Desulfurization tests were carried out in a fixed-bed reactor. The structure, composition, specific surface area and pore volume of the sorbents were studied by X-ray diffraction （XRD）, scanning electron microscope （SEM） and Gas adsorption meter. It is showed that ZnFe₂O₄ of spinel structure is not affected by different binders, and its particle diameter is in micron level. The sorbent with kaolinite as binder is the best one among the prepared sorbents for desulfurization, while the one with diatomite as binder is the worst. Different binders modify the textural properties of the sorbent, and then improve its reactivity. Furthermore, the reactivity and sulfur capacity of sorbents increase with an increase in its pore volume.更多还原