不同热解活化条件下制备的污泥炭常温催化氧化NO  

Low temperature catalytic oxidation of NO over sludge char under different pyrolysis activation conditions

作　　者：周易 邓文义[1] 胡明涛 许铈尧 苏亚欣[1] ZHOU Yi;DENG Wen-yi;HU Ming-tao;XU Shi-yao;SU Ya-yin(School of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《燃料化学学报》2022年第3期366-375,共10页Journal of Fuel Chemistry and Technology

基　　金：上海自然科学基金(19ZR1400700);中央高校基本科研业务费专项资金(2232019D3-24);上海市科委科研计划(19DZ1204900)资助。

摘　　要：以市政污泥为原料制备污泥炭(SC),开展了SC常温催化氧化NO的实验研究。通过对不同热解温度(600、700和800℃)和不同干基污泥(DS)/KOH混合质量比下(4∶1、3∶1、2∶1和1∶1)的NO脱除特性研究,探究了污泥裂解活化工艺对NO常温催化氧化的影响规律和作用机理。结果表明,热解温度和KOH活化均对SC的催化活性有显著影响,当热解温度由600℃升至800℃,裂解样的NO转化率由12%升至36%;不同热解温度下,SC的催化活性均随KOH用量增加呈先增大后减小趋势;当热解温度为700℃、DS/KOH=3∶1时,SC的催化活性最优,达到56%;对该样品进一步进行氢气还原处理后,其脱硝效率进一步提升,达到76.5%。研究发现,SC的催化活性与其比表面积有强相关性,其反应机理遵循Eley-Rideal(E-R)模型。Catalytic oxidation of NO(CONO)at ambient temperature over sludge char(SC)prepared from sewage sludge was studied in this paper.The influencing mechanism of sludge pyrolysis/activation parameters on the CONO were investigated for the SC prepared with different pyrolysis temperatures(600,700,and 800℃)and different mass ratios of dried sludge(DS)to KOH(DS/KOH=4∶1,3∶1,2∶1,and 1∶1).The results indicated that both pyrolysis temperature and KOH activation had great influence on the catalytic performance of SC.With the increase of temperature from 600 to 800℃,the NO conversion increased from 12%to 36%.However,the catalytic activity of KOH-activated SC increased and then decreased with the increase of KOH content.The SC prepared under the pyrolysis temperature of 700℃and the DS/KOH mass ratio of 3∶1 showed the best catalytic performance with NO conversion of 56%.The NO conversion further increased to 76.5%when the SC was reduced by H_(2).It was also found that there was a strong correlation between the catalytic activity and the specific surface area of the SCs.The reaction might follow the Eley-Rideal(E-R)mechanism.

关 键 词：NO 催化氧化 污泥炭 KOH活化 热解 

分 类 号：X511[环境科学与工程—环境工程]