Low-temperature selective catalytic reduction(SCR)is important for the elimination of NOx from sta-tionary sources.In the present study,the loading of Ce and W on α-Fe2O3 was achieved through the integration of single-mode microwave and incipient wetness impregnation(IWI)methods.The scanning electron microscopy(SEM)and transmission electron microscopy(TEM)images reveal that the structure of α-Fe2O3 is spindle-like,and the structure remains unchanged after the introduction of Ce and/or W.The results of NH3-SCR investigation demonstrate that NOx conversion over Ce-W/α-Fe2O3 is more than 85％at 300℃,which is much higher than that over Ce/α-Fe2O3 and α-Fe2O3.Our studies illustrate that the addition of Ce can significantly increase the amount of surface oxygen vacancies as well as sites of moderate basicity.On the other hand,the addition of W can obviously decrease the amount of basic sites and increase the number of Br?nsted acid sites.The synergistic effect of Ce and W addition on balancing acidity/basicity properties accounts for the high activity of Ce20W1o/α-Fe2O3 for NOx removal at low temperatures.The study provides insight into the relationship between acidity/basicity properties and catalytic performance of Ce-W/α-Fe2O3 catalysts,which is beneficial to the design of high-performance NH3-SCR catalyst for NOx removal at low temperatures.

Jun Ni;Xuanbei Peng;Linlin Yang;Kai Zhang;Yangyu Zhang;Yanliang Zhou;Xiuyun Wang;Chak-tong Au;Lilong Jiang

National Engineering Research Center of Chemical Fertilizer Catalyst,Fuzhou University,Fuzhou 350002,China

稀土学报（英文版）

[1]Jun Ni;Xuanbei Peng;Linlin Yang;Kai Zhang;Yangyu Zhang;Yanliang Zhou;Xiuyun Wang;Chak-tong Au;Lilong Jiang-.Effects of cerium and tungsten addition on acid-base properties of spindle-like α-Fe2O3 in low-temperature SCR of NOx with NH3)[J].稀土学报（英文版）,2022(11):1734-1742

Ce20W1o

Effects,cerium,tungsten,addition,base,properties,spindle,like,Fe2O3,low,SCR,NOx,NH3,Low,selective,catalytic,reduction,important,elimination,from,sta,tionary,sources,In,present,study,loading,was,achieved,through,integration,single,microwave,incipient,wetness,impregnation,IWI,methods,scanning,electron,microscopy,transmission,TEM,images,reveal,that,structure,remains,unchanged,after,introduction,results,investigation,demonstrate,conversion,over,more,than,which,much,higher,Our,studies,illustrate,significantly,increase,amount,surface,oxygen,vacancies,well,sites,moderate,basicity,On,other,hand,obviously,decrease,number,Br,nsted,synergistic,effect,balancing,acidity,accounts,activity,removal,temperatures,provides,insight,into,relationship,between,performance,catalysts,beneficial,design

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