采用三种不同方法制备了Cu-Zn-Al基甲醇催化剂,然后在水相悬浮液中与H型镁碱沸石混合分散,以制得负载型甲醇催化剂.运用X射线衍射、N2吸附-脱附、透射电镜、程序升温还原、NH3程序升温脱附、H2程序升温脱附和X射线光电子能谱对催化剂进行了表征.考察了催化剂催化CO加氢反应生成二甲醚和烃类的性能.该催化剂是在低和高过饱和度条件下采用共沉淀法和均匀沉淀法制得的.制备方法对前驱体的结构特性(如纯度、结晶度和催化剂颗粒粒径分布)有显著影响.低过饱和度的沉淀条件有利于Cu物种的高度分散,增加了催化剂中金属的比表面积,所得催化剂粒径分布均匀.这些效应进而会影响分子筛的性质,导致其微孔孔体积较小,分子筛酸性位被堵塞.通过Cu比表面积和CO转化速率之间的关联可考察甲醇催化剂的性能.
参考文献
| [1] | J.H. Flores;D.P.B. Peixoto;L.G. Appel.The influence of different methanol synthesis catalysts on direct synthesis of DME from syngas[J].Catalysis Today,20111(1):218-225. |
| [2] | M.M.Gunter;T.Ressler;R.E.Jentoft.Redox Behavior of Copper Oxide/Zinc Oxide Catalysts in the Steam Reforming of Methanol Stuied by in Situ X-Ray Diffraction and Absorption Spectroscopy[J].Journal of Catalysis,20011(1):133-149. |
| [3] | J.Agrell;H.Rirgersson;M.Boutonnet;I.Melian-Cabrera;R.M.Navarro;J.L.G.Fierro.Production of hydrogen from methanol over Cu/ZnO catalysts promoted by ZrO_2 and Al_2O_3[J].Journal of Catalysis,20032(2):389-403. |
| [4] | J. M. Fougerit;N. S. Gnep;M. Guisnet.Selective transformation of methanol into light olefins over a mordenite catalyst: reaction scheme and mechanism[J].Microporous and Mesoporous Materials,19991/2(1/2):79-89. |
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%