Fe-PILC在贫燃条件下催化丙烯选择性还原NO  

Fe-PILC for selective catalytic reduction of NO by propene under lean-burn conditions

作　　者：李前程 苏亚欣[1] 董士林 袁旻昊[1] 周皞 邓文义[1] LI Qian-cheng;SU Ya-xin;DONG Shi-lin;YUAN Min-hao;ZHOU Hao;DENG Wen-yi(School of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;Changzhou Vocational Institude of Engineering,Changzhou 213164,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]常州工程技术学院,江苏常州213164

出　　处：《燃料化学学报》2018年第10期1240-1248,共9页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(51278095);江苏省前瞻性联合研究项目(BY2015032-02)资助~~

摘　　要：采用羟基铁离子柱撑Na-Mont制备了铁柱撑黏土催化剂(Fe-PILC),铁物种作为柱撑成分,同时充当活性组分,研究其在贫燃条件下催化丙烯选择性还原NO的特性。通过XRD、N_2吸附-脱附、H_2-TPR、UV-vis、Py-FTIR等方法对催化剂进行物理化学性质表征,进一步研究其反应机理。研究表明,1.0Fe-PILC在450-600℃时NO的转化率超过98%,N_2的选择性可达97%以上,且抗水蒸气和SO_2的能力较强。XRD和N_2吸附-脱附研究表明,Fe-PILC中铁物种柱撑进入Na-Mont层间,使催化剂的比表面积和孔容增大。H_2-TPR研究表明,Fe-PILC在400℃左右还原能力较强,主要体现为Fe^(3+)→Fe^(2+)的还原。UVvis研究表明,Fe-PILC的脱硝活性与铁氧低聚物种FexOy呈正相关。Py-FTIR研究表明,Fe-PILC表面同时含有Lewis酸和Br■nsted酸性位,Lew is酸性位是C_3H_6与NO进行催化反应的主要活性中心。Iron-pillared clays(Fe-PILC)were prepared by ion-exchange method and the iron species act as the pillaring components and active components and their performances for selective catalytic reduction of NO by propene were investigated under lean-burn conditions.XRD,N 2 adsorption/desorption,H 2-TPR,UV-vis,Py-FTIR,etc were used to characterize the catalysts.The results showed that 1.0Fe-PILC reduced more than 98%of NO at 450-600℃and the selectivity for N 2 reached 97%.The catalytic activity of the 1.0Fe-PILC was slightly influenced by water vapor and SO 2.XRD and N 2 adsorption/desorption characterization results showed that the iron species entered the Na-Mont interlayer and formed much larger specific surface area and pore volume.H 2-TPR results indicated that Fe-PILC had a strong reduction ability at about 400℃,which represented the reduction of Fe 3+→Fe 2+.UV-vis results showed that the denitrification activity of Fe-PILC was positively correlated with the iron oxide oligomer Fe x O y.Py-FTIR results revealed that Lewis acid and Br nsted acid sites formed on the Fe-PILC surface.The main catalytic activity center of C 3H 6 and NO reaction was the Lewis acid site.

关 键 词：贫燃条件 铁柱撑黏土 丙烯 选择性催化还原 NO 

分 类 号：X511[环境科学与工程—环境工程]