摘要
本文以废弃焦粉及褐煤高效利用为出发点，制备低温脱硝催化剂。分别进行焦粉、褐煤半焦的酸碱脱灰实验，不同干馏温度及改性半焦的FTIR、TG-DSC测定，半焦表面酸碱官能团含量测定实验，褐煤基（添加剂）、焦粉粘结成型实验，褐煤配焦粉基活性焦碘吸附值、孔径、机械强度测试实验。利用浸渍法对纯褐煤及焦粉型活性焦进行Fe、Cu、Mn类活性组分负载制备脱硝催化剂，对不同处理方式得到的半焦及活性焦催化剂进行模拟烟气脱硝实验。实验研究得出活性焦最佳水蒸气活化工艺条件及最佳焦粉配入比例，20%焦粉配入褐煤使得活性焦17-25nm范围内的孔明显增多。不同处理方式得到半焦表面酸碱官能团含量不同，Cu基活性焦催化剂脱硝率最高，对NO具有低温高吸附性与中高温SCR还原性，30min内保持85%以上的脱硝率。活性焦表面含氧官能团可以为SCR及无氨脱硝反应提供氧源。
In this work, the purpose was to prepare novel NO removal catalysts at lowtemperature based on the coke fines and lignite. The experiments were as follows:the deashing experiment, the FTIR and TG-DSC tests of modified semi-cokes atdifferent distillation temperature, the acid and alkali functional groups determinationtest on the surface of semi-cokes, the tests of iodine value, pore size and mechanicalstrength on the activated cokes with additives, the bond forming test of coke fines.The activated coke from coke fines and lignite was loaded with activecomponents(Fe, Cu, Mn) by impregnation method. The NO removal experiment wastested using semi-cokes and activated cokes as catalysts. The main results showedthat the optimum activation process condition and proportion of coke fines withactivated cokes. The proportion of pore in the range of17-25nm improved aftermixed with20%coke fines. The semi-cokes with various ways treated had differentacid and alkali functional groups contents. The activated cokes with Cu activecomponents had best efficiency of NO removal that kept85%in30min. Itsdenitration activity manifested low temperature adsorption and high temperaturereduction. The oxygen functional groups of activated cokes could supply oxygensource for denitration reaction of SCR and without ammonia.
引文
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