胺化竹木/褐煤活性炭的表面特性及其脱除SO_2性能  

Bamboo/lignite-based activated carbons produced by steam activation with and without ammonia for SO_2 adsorption

作　　者：李国强[1] 田福海[1] 张永发[1] 丁佳丽[1] 付亚利[1] 王影[1] 张国杰[1] 

机构地区：[1]太原理工大学煤科学与技术教育部与山西省重点实验室,山西太原030024

出　　处：《新型炭材料》2014年第6期486-492,共7页New Carbon Materials

基　　金：山西省自然科学基金(2010011014-1);国家科技支撑计划(2012BAA04B03);国家自然科学基金(51274147)~~

摘　　要：以竹炭与褐煤混合料压块制备出柱状母料，500℃炭化30min后，经0-21．91％氨水气化，850℃活化2h，获得胺化竹村褐煤活性炭。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℃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1～2．5nm，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 car- 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 ammonia-activated 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 e- valuated in a simulated flue gas （SO2 0.1439%, 02 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 1-2.5 nm. Sulfur adsorption capacity of the ammonia-activated one （ 106.1 mg/g） is significantly higher than those of the steam-activated one （69.8 mg/g）. Surface modi- fication of the ammonia-activated 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 ammonia-activated carbon and its surface modified derivative have similar nitrogen contents with a similar proportion of pyridine or nitrile groups （ 398.3-398.9 eV）, amine, amide, imide and pyrrole class groups （400.2-400.8 eV）.

关 键 词：竹木 褐煤 活性炭 胺化 脱硫性能 

分 类 号：TQ424.1[化学工程]