以竹炭与褐煤混合料压块制备出柱状母料,500益炭化30 min后,经0~21.91%氨水气化,850益活化2 h,获得胺化竹木/褐煤活性炭。采用BET和XPS研究竹木/褐煤活性炭的孔结构和表面化学,在100益下考察活性炭对模拟烟气(0.1439%SO2、8.02%O2和10.11%水蒸气)中SO2的脱除性能。结果表明,氨水活化与水蒸气活化形成的竹木/褐煤活性炭孔径分布类似,主要分布于1~2.5 nm,2.42%氨水活化制备的活性炭硫容是水蒸气活化的1.52倍；两种活性炭表面有相同种类的含碳基团,氨水活化后活性炭表面出现了类吡啶或类腈基团和胺、酰胺、酰亚胺及类吡咯基团；竹木/褐煤活性炭的脱硫性能主要与类吡啶基团有关。
A columnarbamboo/lignite material was prepared by briquetting a mixture of bamboo carbon and lignite. Activated carˉ bons were obtained by carbonizing the material at 500 ℃ for 30 min, followed by activation at 850 ℃ for 2 h using either steam or a gaseous mixture of ammonia in water with an ammonia concentration of 2. 42 mass%. The ammoniaˉactivated carbon was soaked in 21. 91% ammonia water for 5 h and dried at 200 ℃ to modify its surface chemical properties. The pore structure and surface chemical states of the activated carbons were investigated by physical adsorption and XPS. Their desulfurization performance was eˉ valuated in a simulated flue gas (SO2 0. 1439%, O2 8. 02% and water vapor 10. 11%) at 100 ℃. Results show that the activated carbons produced with and without ammonia have similar pore size distributions in the range 1ˉ2. 5 nm. Sulfur adsorption capacity of the ammoniaˉactivated one (106. 1 mg/g) is significantly higher than those of the steamˉactivated one (69. 8 mg/g). Surface modiˉ fication of the ammoniaˉactivated carbon further improves its sulfur adsorption capacity to 155. 9 mg/g. The surfaces of the two kinds of activated carbons contain the same type of carbon groups. The ammoniaˉactivated carbon and its surface modified derivative have similar nitrogen contents with a similar proportion of pyridine or nitrile groups (398. 3ˉ398. 9 eV), amine, amide, imide and pyrrole class groups (400. 2ˉ400. 8 eV).
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