CAJ | 학술논문

以生物质稻壳为原料，采用CO2，H3 PO4活化方法，并经NH4 Br溶液改性，分别制备了稻壳热解焦、活化焦和改性焦，并将其作为脱汞吸附剂。采用N2吸附/脱附、SEM-EDS、FTIR等方法研究吸附剂的微观物理化学特性，结果表明：CO2活化使稻壳焦的孔隙结构显著改善，增强了吸附剂对汞的物理吸附能力；H3 PO 4活化使稻壳焦表面生成大量酸性含氧官能团，有利于汞的化学吸附；NH4 Br改性使Br元素有效负载到稻壳焦表面，促进了单质汞向氧化态汞的转化。固定床汞吸附实验结果表明：改性后的稻壳热解焦与活化焦的脱汞效率分别提高了60％与90％，实验120 min后，CO2，H3 PO4活化改性焦的汞吸附效率仍分别保持在90％与80％以上。生物质稻壳经CO2/H3 PO4活化和NH4 Br溶液改性后可作为燃煤电厂烟气喷射脱汞的廉价高效吸附剂。
이생물질도각위원료，채용CO2，H3 PO4활화방법，병경NH4 Br용액개성，분별제비료도각열해초、활화초화개성초，병장기작위탈홍흡부제。채용N2흡부/탈부、SEM-EDS、FTIR등방법연구흡부제적미관물이화학특성，결과표명：CO2활화사도각초적공극결구현저개선，증강료흡부제대홍적물리흡부능력；H3 PO 4활화사도각초표면생성대량산성함양관능단，유리우홍적화학흡부；NH4 Br개성사Br원소유효부재도도각초표면，촉진료단질홍향양화태홍적전화。고정상홍흡부실험결과표명：개성후적도각열해초여활화초적탈홍효솔분별제고료60％여90％，실험120 min후，CO2，H3 PO4활화개성초적홍흡부효솔잉분별보지재90％여80％이상。생물질도각경CO2/H3 PO4활화화NH4 Br용액개성후가작위연매전엄연기분사탈홍적렴개고효흡부제。
Rice husk was pyrolyzed,activated by CO2 and H3 PO4 and modified by NH4 Br separately to prepare rice husk char,rice husk activated char and rice husk modified char as sorbents for remov-al of mercury.Microstructures of the prepared rice husk chars were characterized based on instru-mentations of nitrogen adsorption,SEM-EDS (scanning election microscope energy dispersive spec-trometer)and FTIR (Fourier transform infrared).The experimental results indicate that CO2 activa-tion benefits a more developed microporous structure with higher physisorption capacity;H3 PO4 acti-vation produces a large number of surface acidic oxygen functional groups on the surface of rice husk chars,which are beneficial for the mercury chemisorption;As shown in the EDS spectrum after trea-ted by NH4 Br,bromine is loaded on the rice husk char surface,indicating that elemental mercury will be easily transformed into the oxidized state.Mercury adsorption capacity was evaluated in a fixed bed.The results are summed as follows:after modification,the Hg0 removal efficiency of the rice husk pyrolyzed char is improved over 60% while the activated char is increased by 90%.The mercury adsorption efficiency of CO2 and H3 PO4 activated cokes remains above 90% and 80%,re-spectively,after 120 min of adsorption.The modified CO2 and H3 PO4 activated rice husk chars can be used as the high-efficient and low-cost sorbents for the demercuration process of activated carbon injection applied in coal-fired power plants.