Abstract • Powdered activated coke (PAC) used for SO2 adsorption can be prepared using pulverized coal through a one-step method under a high-temperature flue gas atmosphere, and the PAC performance is significantly affected by the coal type. In this study, five coals with different ranks were used to prepare the PACs through this method in a drop-tube reactor. The pore structures, bulk densities, surface morphologies, and chemical functional groups of the PACs were characterized, and their yields and SO2 adsorption capacities were determined. Results show that the PACs prepared from low-rank coals (IN-coal and ZD-coal) had developed pore structures, abundant oxygen-containing functional groups and high SO2 adsorption capacities, but their yields were relatively low. As the degree of coalification increased, as in JJ-coal and RU-coal, the pore structure parameters, amount of oxygen-containing functional groups, and SO2 adsorption capacities of the PACs demonstrated a decreasing trend, whereas the yields increased. Besides, the XW-coal was found to be unsuitable for PAC preparation, because the resulting PAC had an undeveloped pore structure and a low SO2 adsorption capacity, and caking property of coal is an unfavorable factor in the PAC preparation. These conclusions can provide guidance for the selection of raw materials used to prepare PAC through the one-step method.

中文翻译：

---

高温烟气气氛下用不同煤一步法制备脱硫粉状活性焦

摘要 • 用于SO2 吸附的粉状活性焦(PAC) 可以在高温烟气气氛下使用粉煤通过一步法制备，PAC 性能受煤类型的显着影响。在这项研究中，使用五种不同等级的煤在落管反应器中通过这种方法制备 PAC。表征了 PAC 的孔结构、体积密度、表面形态和化学官能团，并确定了它们的产率和 SO2 吸附能力。结果表明，低阶煤（IN-煤和ZD-煤）制备的PACs具有发达的孔隙结构、丰富的含氧官能团和高SO2吸附能力，但其产率相对较低。随着煤化程度的增加，如JJ-煤和RU-煤，PACs的孔结构参数、含氧官能团的数量和SO2吸附能力呈下降趋势，而产率增加。此外，发现 XW-煤不适合制备 PAC，因为所得 PAC 具有不发达的孔隙结构和低 SO2 吸附能力，煤的粘结性是制备 PAC 的不利因素。这些结论可为一步法制备PAC的原料选择提供指导。因为所得PAC具有不发达的孔隙结构和低SO2吸附能力，煤的粘结性是PAC制备中的不利因素。这些结论可为一步法制备PAC的原料选择提供指导。因为所得PAC具有不发达的孔隙结构和低SO2吸附能力，煤的粘结性是PAC制备中的不利因素。这些结论可为一步法制备PAC的原料选择提供指导。