A series of sulfated CeO2 catalysts were synthesized by impregnation and sol-gel methods and used for selective catalytic reduction (SCR) of NOx by NH3. The results showed that the sulfated CeO2 catalysts prepared by sol-gel method showed excellent catalytic activity at 150–450 °C, and more than 90% NOx conversion was obtained at 232–450 °C with a gas hourly space velocity of 60000 h–1. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorption, Raman, thermogravimetry (TG), H2-tem-perature-programmed reduction (H2-TPR) and Py-infrared spectroscopy (Py-IR). The excellent SCR performance was associated with the surface acidity and the micro-structure. The introduction of sulfate acid into CeO2 could increase the amount of Br?nsted and Lewis acid sites over the catalysts, resulting in the improvement of the low temperature activity. The sulfated CeO2 catalysts prepared by sol-gel method possessed lower crystallization degree, excellent redox property and larger specific surface areas, which were re-sponsible for the superior SCR performance.
参考文献
| [1] | Zhongbiao Wu;Ruiben Jin;Haiqiang Wang.Effect of ceria doping on SO2 resistance of Mn/TiO2 for selective catalytic reduction of NO with NH3 at low temperature[J].Catalysis Communications,20096(6):935-939. |
| [2] | Shan, W.;Liu, F.;He, H.;Shi, X.;Zhang, C..Novel cerium-tungsten mixed oxide catalyst for the selective catalytic reduction of NO_x with NH_3[J].Chemical communications,201128(28):8046-8048. |
| [3] | Li Zhang;John Pierce;Victor L. Leung.Characterization of Ceria's Interaction with NO_x and NH3[J].The journal of physical chemistry, C. Nanomaterials and interfaces,201316(16):8282-8289. |
| [4] | Zhichun Si;Duan Weng;Xiaodong Wu.Lattice oxygen mobility and acidity improvements of NiO-CeO2-ZrO2 catalyst by sulfation for NO_x reduction by ammonia[J].Catalysis Today,20131(1):122-130. |
| [5] | Haidi Xu;Yun Wang;Yi Cao.Catalytic performance of acidic zirconium-based composite oxides monolithic catalyst on selective catalytic reduction of NO_x with NH3[J].Chemical engineering journal,2014:62-73. |
| [6] | Maria Casapu;Andreas Bernhard;Daniel Peitz.A Niobia-Ceria based multi-purpose catalyst for selective catalytic reduction of NO_x, urea hydrolysis and soot oxidation in diesel exhaust[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,20111/2(1/2):79-84. |
| [7] | Liang Chen;Junhua Li;Maofa Ge.Enhanced activity of tungsten modified CeO2/TiO2 for selective catalytic reduction of NOx with ammonia[J].Catalysis Today,20103/4(3/4):77-83. |
| [8] | Gao, S.;Chen, X.;Wang, H.;Mo, J.;Wu, Z.;Liu, Y.;Weng, X..Ceria supported on sulfated zirconia as a superacid catalyst for selective catalytic reduction of NO with NH_3[J].Journal of Colloid and Interface Science,2013:515-521. |
| [9] | Lee, Y.;He, G.;Akey, A.J.;Si, R.;Flytzani-Stephanopoulos, M.;Herman, I.P..Raman analysis of mode softening in nanoparticle CeO_(2-δ) and Au-CeO_(2-δ) during CO oxidation[J].Journal of the American Chemical Society,201133(33):12952-12955. |
| [10] | G.X. Yu;X.L. Zhou;F. Liu.Effect of isopropanol aging of Zr(OH)4 on n-hexane isomerization over Pt-SO_4~(2-)/Al2O3-ZrO2[J].Catalysis Today,20091/2(1/2):70-74. |
| [11] | Piras A.;Dolcetti G.;Trovarelli A..Remarkable stabilization of transition alumina operated by ceria under reducing and redox conditions[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,20002(2):L77-L81. |
| [12] | S. Damyanova;C.A. Perez;M. Schmal;J.M.C. Bueno.Characterization of ceria-coated alumina carrier[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,20021/2(1/2):271-282. |
| [13] | Xin Zhang;Jin Zhong;Jianwei Wang.Catalytic performance and characterization of Ni-doped HZSM-5 catalysts for selective trimerization of n-butene[J].Fuel Processing Technology,20097/8(7/8):863-870. |
| [14] | Xin Zhang;Jianwei Wang;Jin Zhong.Characterization and catalytic performance of SAPO-11/H beta composite molecular sieve compared with the mechanical mixture[J].Microporous and Mesoporous Materials,20081/3(1/3):13-21. |
| [15] | G. Busca.The surface acidity of solid oxides and its characterization by IR spectroscopic methods. An attempt at systematization[J].Physical chemistry chemical physics: PCCP,19995(5):723-736. |
| [16] | Long R.Q.;Yang R.T..FTIR and Kinetic Studies of the Mechanism of Fe~(3+)-Exchanged TiO-2-Pillared Clay Catalyst for Selective Catalytic Reduction of NO with Ammonia[J].Journal of Catalysis,20001(1):22-31. |
| [17] | Deling Yuan;Xinyong Li;Qidong Zhao.Effect of surface Lewis acidity on selective catalytic reduction of NO by C3H6 over calcined hydrotalcite[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2013:176-183. |
| [18] | Ning Li;Aiqin Wang;Mingyuna Zheng;Xiaodong Wang;Ruihua Cheng;Tao Zhang.Probing into the catalytic nature of Co/sulfated zirconia for selective reduction of NO with methane[J].Journal of Catalysis,20042(2):307-315. |
| [19] | Zhang, Qiulin;Song, Zhongxian;Ning, Ping;Liu, Xin;Li, Hao;Gu, Junjie.Novel promoting effect of acid modification on selective catalytic reduction of NO with ammonia over CeO2 catalyst[J].Catalysis Communications,2015:170-174. |
| [20] | Wanmiao Chen;Yongpeng Ma;Zan Qu.Mechanism of the Selective Catalytic Oxidation of Slip Ammonia over Ru-Modified Ce-Zr Complexes Determined by in Situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy[J].Environmental Science & Technology: ES&T,201420(20):12199-12205. |
| [21] | Tingting Gu;Yue Liu;Xiaole Weng.The enhanced performance of ceria with surface sulfation for selective catalytic reduction of NO by NH3[J].Catalysis Communications,20104(4):310-313. |
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