利用超声-共沉淀技术制备了一系列稀土与钡共掺杂的纳米氧化镁载体(RE-Ba-MgO,RE=La,Sm和Ce)及其负载的钌基氨合成催化剂(Ru/RE-Ba-MgO).通过氮气物理吸附、X98射线衍射、场发射扫描电镜、热重分析仪及H2程序升温还原等方法对载体和催化荆进行了表征.结果表明,Ba在载体中的掺杂形式分为低温分解型BaCO3和高温分解型BaCO3.稀士的掺杂可明显改变载体的表面形态及表面结构,使载体化学与结构性能发生变化,从而导致低温分解型BaCO3的相对含量发生变化,进而改变催化剂的低温活性.在10 MPa,400℃,10 000 h-1的测试条件下,Ru/La-Ba-MgO催化剂的出口氨浓度达到65.49mmol/(g·h),比Ru/Ba-MgO催化剂活性提高了66.3%.
参考文献
| [1] | Liang C H;Wei Zh B;Xin Q;Li C .[J].Applied Catalysis A:General,2001,208(1-2):193. |
| [2] | Liang C H;Li Z L;Qiu J S;Li C .[J].Journal of Catalysis,2002,211(01):278. |
| [3] | Siporin S E;Davis R J .[J].Journal of Catalysis,2004,222(02):315. |
| [4] | Jun I;Masahiro I;Yoshio K;Makoto S Ken-ichi M .[J].Catalysis Communications,2007,8(06):941. |
| [5] | You Z X;lnazu K;Aika K;Baba T .[J].Journal of Catalysis,2007,251(02):321. |
| [6] | 王建梅,王榕,谢峰,林建新,俞秀金,魏可镁.稀土金属氧化物改性整体式钌基氨合成催化剂的制备和性能的研究[J].中国稀土学报,2006(06):666-670. |
| [7] | Szmigiel D;Rarog-Pilecka W;Miskiewicz E;Glinski M.Kielak M,Kaszkur Z,Kowalczyk Z .[J].Applied Catalysis A:General,2004,273(1-2):105. |
| [8] | Goethel P J;Yang R T .[J].Journal of Catalysis,1988,111(01):220. |
| [9] | 霍超,李瑛,韩文锋,刘化章.以氧化镁为载体的钌基氨合成催化剂研究[J].浙江工业大学学报,2002(05):467-469,474. |
| [10] | 霍超,晏刚,郑遗凡,于凤文,刘化章.超声法制备掺钡纳米氧化镁及其负载钌基氨合成催化剂的催化性能[J].催化学报,2007(05):484-488. |
| [11] | Niwa Y;Aika K .[J].Journal of Catalysis,1996,162(01):138. |
| [12] | Hou T;Xu RK;Tiwari D;Zhao AZ .Interaction between electrical double layers of soil colloids and Fe/Al oxides in suspensions[J].Journal of Colloid and Interface Science,2007(2):670-674. |
| [13] | Saito, M;Itoh, M;Iwamoto, J;Li, CY;Machida, K .Synergistic effect of MgO and CeO2 as a support for ruthenium catalysts in ammonia synthesis[J].Catalysis Letters,2006(3/4):107-110. |
| [14] | Piacentini M;Maciejewski M;Baiker A .Supported Pt-BaNOx storage-reduction catalysts: Influence of support and Ba loading on stability and storage efficiency of Ba-containing species[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2006(1/2):126-136. |
| [15] | Zeng H S;lnazu K;Aika K .[J].Journal of Catalysis,2002,211(01):33. |
| [16] | Piacentini M;Maciejewski M;Baike A R .[J].Applied Catalysis B:Environmental,2005,60(3-4):265. |
| [17] | Corbos E C;Courtois X;Bion N;Marecot P Duprez D .[J].Applied Catalysis B:Environmental,2007,76(3-4):357. |
| [18] | Liang C H;Wei Zh B;Luo M F;Ying P L Xin Q Li C .[J].Studies in Surface Science and Catalysis,2001,138:283. |
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