在用于F-T合成的Co/Al2O3催化剂中加入少量助剂,能够提高CO转化率和C5+烃选择性.主要考察了助剂CeO2添加量和催化剂焙烧温度等因素对F-T合成反应的影响,并通过程序升温还原、程序升温氧化及X射线衍射等手段对催化剂进行了表征.结果表明,在Co/Al2O3催化剂中加入少量CeO2(n(Ce)/n(Co)=0.1～0.14),能够有效提高催化剂的催化活性和C5+烃选择性;焙烧温度则以相反的趋势控制F-T反应活性和链增长几率;助剂的加入降低了催化剂的起始还原温度,改善了催化剂的还原性能.但是,催化剂的积碳量有所增加,经10h反应后,催化剂上存在两种类型的积碳.
The effects of ceria-loading and calcination temperature oncatalytic performan ce of Co/Al2O3 in Fischer-Tropsch synthesis were studied, and the catalyst samples were characterized by means of temperature-programmed reduction (TPR), temperature-programmed oxidation (TPO) and XRD techniques. The results showed t hat the addition of small amount of ceria to Co/Al2O3 catalyst (n (Ce)/n(Co)=0.1～0.14) can increase the CO conversion and C5+ hydrocarbons selectivity, while the calcination temperature can co ntrol both the chain growth probability and CO conversion with reverse trend. Th e TPR and TPO experiments showed that the addition of small amount of ceria can improve the reducibility of the catalyst, but the amount of cabon-deposition i ncreases, and there are two carbon-deposition species on the catalyst after rea ction for 10 h.
参考文献
| [1] | Hilmen A M;Schanke D;Holmen A .[J].Catalysis Letters,1996,38(3-4):143. |
| [2] | Guerrero-Ruiz A;Sepúlveda-Escribano A;Rodriguez-Ramos I .[J].Applied Catalysis A:General,1994,120(01):71. |
| [3] | Barrault J;Guilleminot A;Achard J C .[J].Applied Catalysis,1986,21(02):307. |
| [4] | Probst J;Barrault J;Alouche A .[J].Studies in Surface Science and Catalysis,1991,61:357. |
| [5] | Ernst B;Hilaire L;Kiennemann A .[J].Catalysis Today,1999,50(02):413. |
| [6] | 代小平,余长春,沈师孔.钴负载量和焙烧温度对F-T合成用Co/Al2O3催化剂活性的影响[J].催化学报,2000(02):161-164. |
| [7] | Bukur D B;Mukesh D;Patel S A .[J].Industrial and Engineering Chemistry Research,1990,29(02):194. |
| [8] | Iglesia E;Reyes S C;Madon R J .[J].Journal of Catalysis,1991,129(01):238. |
| [9] | Fan L;Yoshii K;Yan Sh R .[J].Catalysis Today,1997,36(03):295. |
| [10] | Khassin A A;Yurieva T M;Parmon V N .[J].Reaction Kinetics and Catalysis Letters,1998,64(01):55. |
| [11] | Iglesia E;Soled S L;Fiato R A .[J].Journal of Catalysis,1993,143(02):345. |
| [12] | Vada S;Hoff A;Aadnanes E .[J].Topics in Catalysis,1995,2(1-4):155. |
| [13] | Schanke D;Vada S;Blekkan E A .[J].Journal of Catalysis,1995,156(01):89. |
| [14] | Roe G M;Ridd M J;Cavell K J .[J].Studies in Surface Science and Catalysis,1998,36:509. |
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