基于正交实验探究Fe-Beta分子筛催化剂SCR脱硝性能  

Investigation of SCR denitrification performance of Fe-Beta zeolite catalysts based on the orthogonal experiments

作　　者：肖萌 岳俊杰[1] 李彭辉[1] 郭铭玉 赵英杰[2] 刘博群 崔少平 高婧 牛可 XIAO Meng;YUE Junjie;LI Penghui;GUO Mingyu;ZHAO Yingjie;LIU Boqun;CUI Shaoping;GAO Jing;NIU Ke(School of Environmental Science and Safety Engineering,Tianjin University of Technology,Tianjin 300384,China;Laboratory of Environmental Protection in Water Transport Engineering,Tianjin Research Institute for Water Transport Engineering,Tanggu,Tianjin 300456,China)

机构地区：[1]天津理工大学环境科学与安全工程学院,天津300384 [2]交通运输部天津水运工程科学研究院水路交通环境保护技术实验室,天津300456

出　　处：《环境工程学报》2024年第10期2878-2888,共11页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金青年项目(52200128);天津市自然科学基金青年项目(23JCQNJC00500);中央级公益性科研院所基本科研业务费专项资金项目(TKS20230303)(TKS20240302)。

摘　　要：该研究采用正交实验探究并制备性能优异的Fe-Beta催化剂用于高效脱除氮氧化物。通过合成一系列Fe-Beta催化剂,并考察其在NH_(3)选择性催化还原NO_(x)反应中的催化性能,筛选出最优配方:硅铝比为30、固液比为1∶20 g·mL^(-1)、采用Fe(NO3)_(3)·9H_(2)O制备的前驱体溶液浓度为0.02 mol·L^(-1)。Fe/Beta-30-1∶20(0.02)催化剂在350~450℃内NO转化率在90%以上且具有优异的N_(2)选择性。此外,Fe/Beta-30-1∶20(0.02)催化剂具有良好的抗SO_(2)性和抗H_(2)O性能以及优异的水热稳定性。表征结果表明,由于分子筛与金属离子之间存在协同作用,在Beta分子筛中添加适量的铁(2.18%)时,会增加SCR反应活性位点数量,拓宽活性温度窗口。同时,Fe-Beta催化剂具有较大的BET比表面积、较均匀的粒径尺寸以及孔径分布均匀,有助于NH_(3)-SCR反应进行。In this study,orthogonal experiments were used to investigate and prepare Fe-Beta catalysts with highly effective NO_(x)removal.A series of Fe-Beta catalysts were synthesized,and their catalytic performance in the selective catalytic reduction of NO_(x)reaction by NH_(3)(NH_(3)-SCR)was investigated,the optimal formulations were screened out as follows∶the SiO_(2)∶Al_(2)O_(3) ratio of 30,the solid-liquid ratio of 1∶20 g·mL^(-1),and the precursor solution concentration of 0.02 mol·L^(-1)prepared with Fe(NO3)_(3)·9H_(2)O.The Fe/Beta-30-1∶20(0.02)catalyst showed higher than 90%NO conversion and had an excellent N_(2) selectivity within 350~450°C.In addition,the Fe/Beta-30-1∶20(0.02)catalyst had good SO_(2)resistance and H_(2)O resistance as well as an excellent hydrothermal stability.The characterization results showed that the addition of Fe(2.18%)in the Beta zeolite enhanced the active sites for SCR reaction and widened the active temperature window due to the synergistic effects of zeolite and Fe ions.Meanwhile,the Fe-Beta catalyst possessed large BET specific surface area,more uniform particle size and pore size,which was conducive to the NH_(3)-SCR reaction.

关 键 词：Fe-Beta催化剂 分子筛 选择性催化还原 正交实验 抗中毒性能 水热稳定性 

分 类 号：X511[环境科学与工程—环境工程]