Partial oxidation of dimethyl ether over various supported metal catalysts
Partial oxidation of dimethyl ether over various supported metal catalysts
复制标题
DOI：
10.1016/s0926-860x(01)00985-1
复制
发表时间：
2002-03
影响因子：
5.5
通讯作者：
Shizhong Wang;T. Ishihara;Y. Takita
中科院分区：
文献类型：
--
作者：
Shizhong Wang;T. Ishihara;Y. Takita
研究了二甲醚在不同金属催化剂上的部分氧化反应。在大多数负载型金属催化剂上，二甲醚具有较高的氧化活性，在低于600 K的温度下可部分氧化为CO和H2。二甲醚部分氧化产物不仅对金属催化剂有很强的依赖性，而且对氧化物载体也有很强的依赖性。CO，H2，CH 4，HCHO，CO2，和H2O的形成观察Al 2 O3负载的催化剂。然而，在SiO_2、MgO、Y_（0.16）Zr_（0.84）O_2（YSZ）、Ce_（0.85）Sm_（0.15）O_3和LaGa_（0.8）Sr_（0.2）Ga_（0.8）Mg_（0.15）Co_（0.05）O_3（LSGMC）上负载的催化剂上没有甲醛生成。以Al_2 O_3为载体的催化剂对二甲醚部分氧化的活性大小顺序为Ni>Rh>Co、Ru>Fe>Pt、Ag。特别是，负载在LaGaO 3基氧化物上的Ni对DME部分氧化成合成气具有活性和选择性。进一步研究了反应条件对Ni/LSGMC的影响。CO和H2的选择性随着接触时间的减少而增加。因此，该反应的主要产物是CO和H2，副产物CH 4似乎是次要产物。在较低的反应温度下，Ni/LSGMC上形成了少量的焦炭;然而，在高温下，焦炭的量很小。
Partial oxidation of dimethyl ether (DME) on various metal catalysts was investigated. DME was highly active for oxidation and could be partially oxidized into CO and H2at a temperature lower than 600K on most of the examined supported metal catalysts. The products of partial oxidation of DME depended strongly not only on the metal catalyst but also on the oxide support. Formation of CO, H2, CH4, HCHO, CO2, and H2O were observed on Al2O3-supported catalysts. However, no HCHO was formed on the catalysts supported on SiO2, MgO, Y0.16Zr0.84O2(YSZ), Ce0.85Sm0.15O3, and LaGaO3based oxide, i.e. La0.8Sr0.2Ga0.8Mg0.15Co0.05O3(LSGMC). The activity to partial oxidation of DME on catalysts supported on Al2O3increased in the order of Ni>Rh>Co⪢Ru>Fe>Pt⪢Ag. In particular, Ni supported on LaGaO3based oxide was active and selective for partial oxidation of DME into synthesis gas. Effects of reaction conditions were further studied on Ni/LSGMC. Selectivity to CO and H2increased with decreasing contact time. Therefore, primary products of this reaction are CO and H2and the byproduct CH4seems to be a secondary product. A small amount of coke was formed on Ni/LSGMC at low reaction temperatures; however, the amount was tiny at high temperatures.