Effect of binder on the property of zinc ferrite sorbents for desulfurization of high temperature coal gas
黏结剂对铁酸锌脱硫剂在高温煤气中脱硫性能的影响

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 ZnFe_2O_4 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.