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采用共沉淀法制备一系列钴基脱硫剂,考察了Zn和Ce掺杂对其脱硫性能的影响。脱硫性能测试结果显示,只有在Zn和Ce共掺杂的条件下,钴基吸附剂(15%Zn O-15%Ce O2-70%Co3O4)脱硫性能显著提高。在25℃、体积空速3 000 h-1、H_2S质量浓度1.39×10-3g/L的条件下,其穿透硫容为7.44%,是纯Co3O4的3.35倍。在不同温度下测试其脱硫性能,发现在50~150℃内提升速度最快,再升高温度,脱硫性能提升缓慢。通过X射线衍射(XRD)、N2物理吸附、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)对吸附剂进行了表征,结果显示,Zn和Ce共掺杂后,吸附剂的结晶度降低,比表面积增大,孔道结构丰富,Zn~(2+)和Ce~(4+)分别取代Co~(2+)和Co~(3+),所形成的氧空位和表面化学结构的改变有利于提高钴基吸附剂的脱硫性能。
A series of cobalt-based desulfurizers were prepared by co-precipitation method. The effects of Zn and Ce doping on their desulfurization performance were investigated. The desulfurization performance test results show that the desulfurization performance of cobalt-based adsorbent (15% Zn O-15% Ce O2-70% Co3O4) is significantly increased only in the co-doped Zn and Ce. Under the conditions of 25 ℃, space velocity 3 000 h-1, H 2 S mass concentration 1.39 × 10-3g / L, the penetration sulfur capacity is 7.44%, which is 3.35 times that of pure Co3O4. The desulfurization performance was tested at different temperatures and found that in the 50 ~ 150 ℃ to enhance the fastest, then increase the temperature, desulfurization performance to promote slow. The adsorbents were characterized by X-ray diffraction (XRD), N2 physical adsorption, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that the crystallinity Decreased, the specific surface area increased, and the pore structure was abundant. Zn 2+ and Ce 4+ replaced Co 2+ and Co 3+, respectively, resulting in oxygen vacancy and surface chemical structure Change is conducive to improving the desulfurization performance of cobalt-based adsorbents.