采用溶胶凝胶法制备了Ce0.65-xCoxK0.15Zr0.2O2 (x=0,0.15,0.23,0.30,0.38和0.45)系列催化剂,用XRD、SEM、BET、H2-TPR及程序升温氧化(TPO)反应等方法考察了Co含量对催化剂结构和催化活性的影响,重点探讨了催化剂表面性质和体相结构与催化活性和稳定性之间的关系.结果表明:所得催化剂呈现出网状多孔结构,Co离子难以大量扩散至CeO2晶格中,而是以Co3O4粒子形式分散在样品表面.老化前催化剂表面Co3O4颗粒的数量和尺寸对催化剂的催化活性起关键性作用,而进入到CeO2晶格中的钴离子则对提高催化剂的抗老化能力产生重要影响.当x=0.23时,催化剂表面出现大量具有高活性的细小Co3O4粒子,催化碳烟燃烧活性最高,起燃温度Ti与最大燃烧速率温度Tm分别为321℃与355℃,但该Co3O4粒子经空气气氛下800℃老化处理后易失活;当x=0.15时,催化剂老化前并未表现出优异的催化活性,但老化后因具有较多钴铈锆固溶体而表现出了最高的稳定性与催化碳烟燃烧活性,其Ti与Tm仍可达375℃与439℃.
参考文献
| [1] | Palma, Vincenzo;Ciambelli, Paolo;Meloni, Eugenio;Sin, Agusti.Catalytic DPF microwave assisted active regeneration[J].Fuel,2015Jan.15(Jan.15):50-61. |
| [2] | Xiaodong Wu;Shuang Liu;Duan Weng;Fan Lin;Rui Ran.MnO_x-CeO_2-Al_2O_3 mixed oxides for soot oxidation: Activity and thermal stability[J].Journal of hazardous materials,20111/3(1/3):283-290. |
| [3] | 陈志刚;于雷;陈丰;张玉珠;徐政.CuO/Ce1-xAlxO2催化剂的制备及其催化性能研究[J].材料导报,2013(20):48-51. |
| [4] | Ali Alinezhadchamazketi;Abas Ali Khodadadi;Yadollah Mortazavi;Ahmad Nemati.Catalytic evaluation of promoted CeO2-ZrO2 by transition, alkali, and alkaline-earth metal oxides for diesel soot oxidation[J].环境科学学报（英文版）,2013(12):2498-2506. |
| [5] | Guizhen Zhang;Zhen Zhao;Junfeng Xu.Comparative study on the preparation, characterization and catalytic performances of 3DOM Ce-based materials for the combustion of diesel soot[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,20113/4(3/4):302-315. |
| [6] | 王世丹;朱艺;张海龙;龚茂初;陈耀强.Ce0.64Mn0.13R0.23Ox催化剂催化燃烧柴油机碳烟的研究[J].无机化学学报,2014(8):1827-1833. |
| [7] | 顾振华;桑秀丽;王华;李孔斋.Structure and catalytic property of CeO2-ZrO2-Fe2O3 mixed oxide catalysts for diesel soot combustion: Effect of preparation method[J].稀土学报（英文版）,2014(9):817-823. |
| [8] | Yuechang Wei;Jian Liu;Zhen Zhao.Structural and synergistic effects of three-dimensionally ordered macroporous Ce_(0.8)Zr_(0.2)O2-supported Pt nanoparticles on the catalytic performance for soot combustion[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2013:250-261. |
| [9] | Hong Liang;Shaotao Wu;Yanxia Hong.Influence of Alkali Metals with Different Ionic Radius Doping into Ce_(0.7)Zr_(0.3)O2 on the Active Oxygen[J].Catalysis Letters,20144(4):685-690. |
| [10] | 洪燕霞;梁红;李树华;王婷婷.钾元素掺杂对铈锆固溶体中氧物种的影响[J].中国稀土学报,2012(4):429-435. |
| [11] | 朱玲;王学中;於俊杰;郝郑平.K-Ce0.5Zr0.5O2催化碳颗粒物燃烧性能[J].物理化学学报,2005(8):840-845. |
| [12] | Jian Liu;Zhen Zhao;Jiqiu Wang.The highly active catalysts of nanometric CeO2-supported cobalt oxides for soot combustion[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,20081/2(1/2):185-195. |
| [13] | Eleonora Aneggi;Carla de Leitenburg;Giuliano Dolcetti.Diesel soot combustion activity of ceria promoted with alkali metals[J].Catalysis Today,20081/2(1/2):3-10. |
| [14] | Min Sun;Li Wang;Bingnan Feng.The role of potassium in K/Co3O4 for soot combustion under loose contact[J].Catalysis Today,20111(1):100-105. |
| [15] | 韦岳长;刘坚;赵震;姜桂元;段爱军;何洪;王新平.Co_（0.2）/Ce_（1-x）Zr_xO_2催化剂的制备、表征及其催化碳烟燃烧反应性能[J].催化学报,2010(3):283-288. |
| [16] | Agus Setiabudi;Jiuling Chen;Guido Mul;Michiel Makkee;Jacob A.Moulijn.CeO_2 catalysed soot oxidation The role of active oxygen to accelerate the oxidation conversion[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,20041(1):9-19. |
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%