考察了添加稀土Ce对Mn/γ-Al2O3催化剂的织构-结构、表面活性组分的分布及氧化还原性能的影响,以催化燃烧易挥发有机污染物(VOCs)苯为探针反应研究了Ce对Mn基催化剂催化性能的影响.采用传统的浸渍法制备了系列催化剂,利用粉末X射线衍射(XRD),N2吸脱附程序升温还原(TPR)等手段对催化剂进行了表征分析.结果表明,添加稀土使Mn基催化剂比表面积、孔体积减小,说明部分Ce进入孔道中,形成了更多的氧化还原活性位,并且进一步研究得知,适量Ce的添加可以促进催化剂活性位的自组装,达到理想的催化氧化性能.添加Ce后,催化剂的活性组分中高价Mn的含量明显增加,这些都有利于提高催化剂的氧化性能.活性实验结果表明,添加适量Ce优化了催化剂的织构-结构、表面活性组分及氧化还原性能,因此催化剂的活性和稳定性明显提高,其中以MnCe为1∶1时,活性最佳,280℃左右就能完全转化苯.
参考文献
| [1] | Vincent D J;Mariusz K;Robert L .Formation of dioxins in the catalytic combustion of chlorobenzene and a micropollutant-like mixture on Pt/γ-Al2O3[J].Environmental Science and Technology,2004,38:5217. |
| [2] | Tidahy H L;Siffert S;Wyrwalski F;Lamonier J F Aboukalls A .Catalytic activity of copper and palladium based catalysts for toluene total oxidation[J].Catalysis Today,2007,119:17. |
| [3] | 童志权.工业废气净化与利用[M].北京:化学工业出版社,2001:419. |
| [4] | Hyoung S K;Tae W K;Hyoung L K;Seo H L .Complete benzene oxidation over Pt-Pd bimetal catalyst supported on γ-alumina:Influence of Pt-Pd ratio on the catalytic activity[J].Applied Catalysis A:General,2005,280:125. |
| [5] | Glyhol A C;Nieuwenhuys B E .Catalytic oxidation of saturated hydrocarbons on multicompnent Au/Al2O3 catalysts effect of various promoters[J].Catalysis Today,2007,119:305. |
| [6] | 邢涛,邵芸,王家宏,刘凤玲,李丽媛,许昭怡,郑寿荣.Cr/γ-Al_2O_3对乙酸乙酯的催化燃烧[J].环境化学,2009(06):818-822. |
| [7] | Bertinchamps F;Gregoire C;Gaigneaux EM .Systematic investigation of supported transition metal oxide based formulations for the catalytic oxidative elimination of (chloro)-aromatics - Part II: Influence of the nature and addition protocol of secondary phases to VOx/TiO2[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2006(1/2):10-22. |
| [8] | Choudhary V R;Suryakant B S;Pataskar S G .Low temperature conplete combustion of diute methane over Mn-doped ZrO2 catalysts:factors influencing the reactivity of lattice oxygen and methane combustion activity of the catalyst[J].Applied Catalysis A:General,2002,227(01):29. |
| [9] | Stoyanka Christoskova;Maria Stoyanova;Dragomir Vasilev .Active Oxygen in Oxide Catalytic Systems for Environmental Catalysis[J].Monatshefte fur Chemie,2006(8):1043-1051. |
| [10] | Alvarez-Galván M C;de la Peiia(o)Shea V A;Fierro J L G;Arias P L .Alumina-supported manganese-and manganese-palladium oxide catalysts for VOCs combustion[J].Catalyst Communication,2003,5:223. |
| [11] | 郭锡坤,贾海建,范倩玉,李文衍,刘伟明.Cu-Ce-Zr-O复合氧化物催化剂的制备与三效催化性能[J].催化学报,2009(02):124-130. |
| [12] | Liu W.;Flytzanistephanopoulos M. .TOTAL OXIDATION OF CARBON MONOXIDE AND METHANE OVER TRANSITION METAL-FLUORITE OXIDE COMPOSITE CATALYSTS .1. CATALYST COMPOSITION AND ACTIVITY[J].Journal of Catalysis,1995(2):304-316. |
| [13] | Sara C;Carla de L;GiulianoD .The role of rare earth oxides as promoters and stabilizer in combusition catalysts[J].Journal of Alloys and Compounds,2004,374:387. |
| [14] | Labaki M.;Siffert S.;Lamonier JF.;Zhilinskaya EA.;Aboukais A. .Total oxidation of propene and toluene in the presence of zirconia doped by copper and yttrium - Role of anionic vacancies[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2003(3):261-271. |
| [15] | Shigeru Sugiyama;Kouhei Sogabe;Takashi Miyamoto;Hiromu Hayashi;John B. Moffat .Oxidative dehydrogenation of ethane on rare earth oxides: effects of chlorine additives in gas and solid phase on the oxidation over cerium oxide[J].Catalysis Letters,1996(3/4):127-133. |
| [16] | Rui C. Martins;Rosa M. Quinta-Ferreira .Catalytic ozonation of phenolic acids over a Mn-Ce-O catalyst[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2009(1/2):268-277. |
| [17] | Boot L;Kerkhoffs M;van der Linden B;Jos van Dillen A Geus J van Buren F R .Preparation,characterization and catalytic testing of cobalt oxide and manganese oxide catalysts supported on zirconia[J].Applied Catalysis A:General,1996,137:69. |
| [18] | 李想,孟明,姚金松,谢亚宁,胡天斗,刘涛.Mn/Ce/La/Al2O3催化剂中锰物种的精细结构研究[J].无机化学学报,2007(02):211-216. |
| [19] | 刘长春,於俊杰,蒋政,陶炎鑫,郝郑平,何绪文.Ce1-XMnXO2-a复合氧化物催化剂甲烷催化燃烧性能的研究[J].无机化学学报,2007(02):217-224. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%