以TiO2为载体,采用挤压成型法制备了钒系蜂窝整体式SCR脱硝催化剂,通过N2吸附-脱附（BET）、X射线衍射（XRD）、扫描电镜（SEM）、FT-Ra-man光谱等表征手段和催化活性测试对混合练泥工序中助催化剂WO3不同引入方式制备的催化剂进行了对比研究。实验结果表明,由钛钨粉制备的催化剂具有较大的比表面积及孔容积;而由偏钨酸铵制备的催化剂具有较均匀的微观结构形貌,活性物种分散性好,拥有更多的VO6八面体结构,且出现了WOx四面体结构,表现出良好的NH3-SCR活性和较宽的活性温度窗口,在空速为10000h-1,氨氮比为1.0时,活性温度范围内NO脱除率达到了93%。
Vanadium contained honeycomb monolithic SCR DENO, catalysts were prepared by extrumon morning with TiO2 as support. The catalysts obtained with different introduce way of WOz in mixing process were com- parative researched. The catalysts were characterized by brunauer-emmett-teller （BET）, X ray diffraction （XRD）, scanning electron microscope （SEM）, FT-Raman and evaluated by catalytic activity test. The experi- mental results show that： catalyst made by WO3-TiO2 powders has a higher surface area and a larger porous volume. Catalyst made by ammonium metatungstate has homogeneous microscopic structure. The active spe- cies are well dispersed on TiO2. In addition, much more actahedral vanadyl species is formed and tetrahedral wolframyl species is found. It presents a superior activity and has a wide activity temperature window. The NOx conversion is up to 93% in the activity temperature range at the gas hourly space velocity of 10000 h^-1 , n （NH3）/n（NO）=1.
参考文献
| [1] | Choung J W;Nam I S;Ham S W .[J].Catalysis Today,2006,111(3-4):242-247. |
| [2] | 杨眉,刘清才,薛屺,高英.化学气相沉积制备V2O5-WO3/TiO2催化剂及表征[J].功能材料,2010(04):683-686. |
| [3] | Madia G;E/sener M;Koebel M et al.[J].Applied Ca- talysis B:Environmental,2002,39(02):181-190. |
| [4] | Scholz A;Schnyder B;Wokaun A .[J].Journal of Mo- lecular Catalysis A:Chemical,1999,138(2-3):249-261. |
| [5] | Kobayashi M;Miyoshi K .WO3-TiO2 monolithic catalysts for high temperature SCR of NO by NH3: Influence of preparation method on structural and physico-chemical properties, activity and durability[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2007(3/4):253-261. |
| [6] | 沈伯雄,熊丽仙,刘亭,王静,田晓娟.纳米负载型V_2O_5－WO_3/TiO_2催化剂碱中毒及再生研究[J].燃料化学学报,2010(01):85-90. |
| [7] | 朱崇兵,金保升,仲兆平,李锋,翟俊霞.V2O5-WO3/TiO2烟气脱硝催化剂的载体选择[J].中国电机工程学报,2008(11):41-47. |
| [8] | Reiche M.A.;Hug;P.;Baiker A. .Effect of Grafting Sequence on the Behavior of Titania-Supported V_2O_5-WO_3 Catalysts in the selective Reduction of NO by NH_3[J].Journal of Catalysis,2000(2):400-411. |
| [9] | 吕刚,宋崇林,宾峰,张清茂,裴毅强.不同制备工艺钒系SCR催化剂理化及催化性能研究[J].工程热物理学报,2009(12):2157-2160. |
| [10] | Dierad S;Tifouti L;Crocoll M et al.[J].Journal of Molecular Catalysis A:Chemical,2004,208(1-2):257-265. |
| [11] | Reiche M.A. .Vanadia and tungsta grafted on TiO_2: influence of the grafting sequence on structural and chemical properties[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2000(12):155-169. |
| [12] | 姚杰,仲兆平,陈晓林,郑秋萍.溶胶/粉末复合浸渍法制备颗粒状SCR脱硝催化剂的特性[J].环境科学研究,2010(05):653-657. |
| [13] | Wang Zaihua;Li Xinjun;Song Wenji et al.The effects of Ag doped to the Ag-V/TiOe catalysts with tow vana- dium loading for DENO[J].Journal of Functional Ma- terials,2010,42(09):16101618. |
| [14] | Zhang X;Li X G;Wu J S .[J].Catalysis Letters,2009,130(1- 2):235-238. |
| [15] | 沈伯雄,杨婷婷,刘亭,王静,赵宁.纳米负载型选择性催化还原反应催化剂的制备和性能研究[J].中国电机工程学报,2008(35):27-32. |
| [16] | 袁泉东,卢晗锋,黄海风.多孔TiO2为载体的V2O5-WO3脱硝催化剂制备和表征[J].环境污染与防治,2008(06):58-61. |
| [17] | Baraket L;Ghorbel A;Grange P .Selective catalytic reduction of NO by ammonia on V2O5-SO42-/TiO2 catalysts prepared by the sol-gel method[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2007(1/2):37-43. |
| [18] | Djerad S;CrocoU M;Kureti S et al.[J].Catalysis To- day,2006,113(3-4):208-214. |
| [19] | Alemany LJ.;Ferlazzo N.;Forzatti P.;Busca G.;Giamello E. Bregani F.;Lietti L. .REACTIVITY AND PHYSICOCHEMICAL CHARACTERISATION OF V2O5-WO3/TIO2 DE-NOX CATALYSTS[J].Journal of Catalysis,1995(1):117-130. |
| [20] | Ioanna Giakoumelou;Christina Fountzoula;Christos Kordulis;Soghomon Boghosian .Molecular structure and catalytic activity of V_2O_5/TiO_2 catalysts for the SCR of NO by NH_3:In situ Raman spectra in the presence of O_2,NH_3,NO,H_2,H_2O,and SO_2[J].Journal of Catalysis,2006(1):1-12. |
| [21] | Akurati KK;Vital A;Dellemann JP;Michalow K;Graule T;Fetti D;Baiker A .Flame-made WO3/TiO2 nanoparticles: Relation between surface acidity, structure and photocatalytic activity[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2008(1):53-62. |
| [22] | Albonetti S;Blasioli S;Bruno A .[J].Applied Cataly- sis B:Environmental,2006,64(1-2):1-8. |
| [23] | Amiridis M D;Duevel R V;Wachs I E .[J].Applied Catalysis B:Environmental,1999,20(01):111-122. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%