非晶态CeO2@TiO2催化剂的结构、性质及其选择催化还原脱硝性能  

Structure and properties of amorphous CeO_2@TiO_2 catalyst and its performance in the selective catalytic reduction of NO with NH_3

作　　者：刘俊[1,2] 王亮亮[1,2] 费兆阳[1,2] 陈献[1] 汤吉海[1] 崔咪芬[1] 乔旭[1,2] 

机构地区：[1]南京工业大学材料化学工程国家重点实验室,江苏南京210009 [2]南京工业大学化学化工学院,江苏南京210009

出　　处：《燃料化学学报》2016年第8期954-960,共7页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(21306089);国家科技支撑计划(2011BAE18B01);江苏省创新基金(SJLX15-0347)资助~~

摘　　要：采用自发沉积法制备了非晶态Ce O_2@Ti O_2催化剂,通过XRD、Raman光谱、TEM、N_2吸附、H_2-TPR、NH_3-TPD及FTIR等手段表征了催化剂结构和表面性质,研究了Ce O_2@Ti O_2在选择催化还原脱NO反应中的催化性能。结果表明,非晶态Ce O_2@Ti O_2催化剂中Ce与Ti间存在很强的相互作用,能够在原子水平上相互结合,表现出与晶态结构截然不同的还原特性,具备更强的氧化还原能力。同时,与浸渍法制备的Ce O_2/Ti O_2相比,Ce O_2@Ti O_2还具有更大的比表面积和更强的表面酸性,因而具有更加优异的脱硝性能。在175℃下NO转化率即达到80%以上,在200-400℃脱硝率稳定在96.0%-99.4%;同时,H_2O和SO_2的阶跃应答实验表明,Ce O_2@Ti O_2具有很强的抗水和抗SO_2毒化能力。Amorphous CeO2@TiO2 catalyst was prepared by spontaneous deposition method and characterized by XRD, Raman spectra, TEM, N2 physisorption, H2-TPR, NH3-TPD and FT-IR; its performance in the selective catalytic reduction （ SCR） of NO with NH3 was investigated. The results show that there is a strong interaction between Ce and Ti which are combined at atomic level. In comparison with the crystal CeO2/TiO2 catalyst prepared by impregnation, the amorphous CeO2@ TiO2 catalyst exhibits larger surface area and pore volume, excellent redox ability and acidity, and outstanding catalytic performance in SCR. Over the CeO2@TiO2 catalyst, the conversion of NO reaches 80% at 175 ℃ and retains 96. 0% -99. 4% at 200-400 ℃. Moreover, the amorphous CeO2@TiO2 catalyst also shows strong resistance to H2 O and SO2 poisoning.

关 键 词：非晶态 CeO2TiO2 选择性催化还原 自发沉积法 脱硝 抗二氧化硫 

分 类 号：O643.3[理学—物理化学]