摘要
以污水厂剩余污泥为原料，以氯化锌和硝酸铁为活化药剂，制备了新型碳质催化剂，主要制备步骤包括化学活化、浸渍、热解和洗涤．通过扫描电镜、BET表面积和热重分析对催化剂进行了表征分析．结果显示，催化剂表面具有丰富的孔结构，BET比表面积可达307m^2／g或更大．考察了它们在NH3选择催化还原NOx中的催化活性，同时考察了n（Zn^2＋）／规（Fe^3＋）、热解温度、氧气体积分数对催化剂活性的影响．实验结果表明：控制n／（Zn^2＋）／n（Fe^3＋）为1：0．5，750℃热解制得的催化剂活性最好，在反应温度400℃时最高NOx转化率可达98．3％；催化反应在氧气体积分数为15％，温度350～450℃条件下进行较好．
Carbonaceous catalysts were produced from the municipal surplus sludge by chemical impregnation method with zinc chlorate and iron nitrate. The major processes involved in the production of the catalysts were chemical activation, impregnation, pyrolysis, and post pyrolysis rinsing. The surfaee areas of the catalysts were calculated from standard N2-adsorptionisotherm data. The change extent of the catalysts＇ mass and activation energy were estimated from thermogravimetfic analysis conducted in an air environment. The NOx reduction capability of the catalysts was evaluated in the presence of ammonia. The reaction temperature ranged from 100 12 to 550 ℃. The catalytic capability of the catalysts varied aceording to Zn^2 ＋/Fe^3 ＋ molar ratio, pyrolysis temperature, oxygen ooncentration, etc. The optimal catalyst was produced in a Zn^2 ＋/Fe^3 ＋ molar ratio of 1：0.5 and pyrolyzed at 750 ℃. The optimal catalyst exhibited the maximum NOx removal catalytic activity of 98.3 % at 400 ℃. The better oondifion of the catalytic reaction was obtained from thermogravimetric analysis and influenee line diagram. The oxygen coneentration was 15 % and the better reaction temperature was from 350 ℃ to 450 ℃.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第6期110-114,共5页
Journal of Hunan University:Natural Sciences
基金
新世纪人才支持计划(NCET-04-0768)
教育部科学研究重点项目(105126)
湖南省自然科学基金重点项目(03JJY2002)
湖南大学基金项目(521101850)
关键词
污泥
热解
化学浸渍
催化剂活性
选择性催化还原
sewage sludge
pyrolysis
chemical impregnation
catalyst activity
selective catalytic reduction
