采用连续共沉淀与喷雾干燥成型技术相结合的方法制备了微球形Fe-Cu-K-SiO2催化剂,并考察了焙烧温度对催化剂的结构和织构性质的影响. 结果表明,催化剂具有较好的织构和结构热稳定性,粘结剂SiO2起到了分散和稳定α-Fe2O3晶相的作用. 随着焙烧温度的升高,催化剂的比表面积逐渐减小,α-Fe2O3晶粒逐渐增大,催化剂体相中的Cu和K原子向表面富集,且Cu向表面的迁移更明显; 同时,催化剂中的α-Fe2O3和CuO相发生了一定程度的离析,Cu的助剂作用减弱,使催化剂在合成气气氛下难于还原碳化. 催化剂在n(H2)/n(CO)=0.67,GHSV=2.0 L/(g*h),p=1.5 MPa和θ=250 ℃下的浆态床F-T合成反应评价结果表明,升高焙烧温度,催化剂的初活性和最高活性下降,但运行稳定性提高,而且有效地抑制了CH4的生成,明显促进了烃产物向高碳数方向移动. 反应600 h后卸载下的催化剂的形貌观测表明,催化剂的磨损主要是由化学磨损引起的,提高焙烧温度可明显改善其抗磨损性能,焙烧温度高于400 ℃时,催化剂具有较好的抗磨损性能.
参考文献
| [1] | Anderson R B.The Fischer-Tropsch Synthesis[M].New York:Academic Press,1984 |
| [2] | 相宏伟,唐宏青,李永旺.煤化工工艺技术评述与展望Ⅳ.煤间接液化技术[J].燃料化学学报,2001(04):289-298. |
| [3] | Shroff MD.;Coulter KE.;Kohler SD.;Harrington MS.;Jackson NB.;Sault AG.;Datye AK.;Kalakkad DS. .ACTIVATION OF PRECIPITATED IRON FISCHER-TROPSCH SYNTHESIS CATALYSTS[J].Journal of Catalysis,1995(2):185-207. |
| [4] | Bai L;Xiang H-W;Li Y-W;Han Y-Z, Zhong B .[J].FUEL,2002,81(11-12):1577. |
| [5] | Davis B H .[J].Catalysis Today,2002,71(3-4):249. |
| [6] | Zhao R;Goodwin J G Jr;Jothimurugesan K;Gangwal S K,Spivey J J .[J].Industrial and Engineering Chemistry Research,2001,40(05):1320. |
| [7] | Pham H N;Datye A K .[J].Catalysis Today,2000,58(04):233. |
| [8] | Espinoza R L;Gibson P;Scholtz J H .[P].WO 9?949?965,1999. |
| [9] | Bukur D B .Development of Precipitated Iron Fischer-Tropsch Catalysts, Final Report, US Department of Energy[R].Contract No. DE-AC22-94PC93069, Texas Engineering Experiment Station, College Station, TX,1999. |
| [10] | 相宏伟;刘福霞;郝庆兰;张成华, 白亮, 张志新, 李永旺.[J].Appl No 2004/10?012?349 3 |
| [11] | 杨勇,陶智超,张成华,王洪,田磊,徐元源,相宏伟,李永旺.焙烧温度对Fe-Mn催化剂结构和F-T合成性能影响[J].燃料化学学报,2004(06):717-722. |
| [12] | 田磊 .[D].呼和浩特:内蒙古工业大学,2003. |
| [13] | Kündig W;Bmmel H .[J].Physical Review,1966,142:327. |
| [14] | Kolk B;Albers A;Leith I R;Howden M G .[J].Applied Catalysis A:General,1988,37(1-2):57. |
| [15] | Jin Y;Datye A K .[J].Journal of Catalysis,2000,196(01):8. |
| [16] | Bukur DB.;Rosynek MP.;Li CP.;Wang DJ.;Rao KRPM.;Huffman GP.;Okabe K. .ACTIVATION STUDIES WITH A PRECIPITATED IRON CATALYST FOR FISCHER-TROPSCH SYNTHESIS .1. CHARACTERIZATION STUDIES[J].Journal of Catalysis,1995(2):353-365. |
| [17] | Dictor R A;Bell A T .[J].Journal of Catalysis,1986,97(01):121. |
| [18] | Bukur D B;Mukesh D;Patel S A .[J].Industrial and Engineering Chemistry Research,1990,29(02):194. |
| [19] | Bukur D B;Lang X S;Mukesh D;Zimmerman W H Rosynek M P Li C .[J].Industrial and Engineering Chemistry Research,1990,29(08):1588. |
| [20] | Biloen P;Sachtler W M H .[J].ADVANCES IN CATALYSIS,1981,30:165. |
| [21] | Bukur D B;Carreto-Vazquez V;Pham H N;Datye A K .[J].Applied Catalysis A:General,2004,266(01):41. |
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%