Partial oxidation of methanol over supported palladium catalysts
Partial oxidation of methanol over supported palladium catalysts
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DOI：
10.1016/s0926-860x(97)00361-x
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发表时间：
1998-03-27
影响因子：
5.5
通讯作者：
Fierro, JLG
中科院分区：
文献类型：
--
作者：
Cubeiro, ML;Fierro, JLG
在 ZnO 和 ZrO2 负载的 Pd 催化剂上研究了甲醇部分氧化（CH3OH+1/2 O-2 可逆箭头 2 H-2+CO2）制氢。在 503-543 K 下，在 O-2/CH3OH（摩尔）进料比为 0.3 和 0.5 的条件下研究了催化剂性能。尽管 Pd/ZnO 和 Pd/ZrO2 催化剂的 BET 面积差异很大，但在比较 H-2 选择性时观察到显着差异。对于 1% Pd/ZnO 催化剂，反应通过连续的氧化→重整步骤发生。然而，1% Pd/ZrO2 催化剂的行为接近第 8 族金属的预期行为，即，尽管观察到 1% Pd/ZnO 催化剂的氧化产物，但似乎发生了更大程度的分解反应。通过 TPR、X 射线衍射和 XPS 进行的催化剂表征表明，在中等温度下还原 Pd/ZnO 催化剂可以形成 PdZn 合金。 (C) 1998 Elsevier Science B.V.
Hydrogen production by partial oxidation of methanol (CH3OH+1/2 O-2 reversible arrow 2 H-2+CO2) was studied over ZnO- and ZrO2-supported Pd catalysts. Catalyst performance was investigated under feed ratios O-2/CH3OH (molar) of 0.3 and 0.5 at 503-543 K. irrespective of the large difference in BET area of Pd/ZnO and Pd/ZrO2 catalysts, significant differences were observed when comparing H-2 selectivities. For the 1% Pd/ZnO catalyst, reaction occurs through consecutive oxidation --> reforming steps. However, the behavior of catalyst 1% Pd/ZrO2 approached that expected for Group 8 metals, that is, although the oxidation products are observed as for the catalyst 1% Pd/ZnO, the decomposition reaction seems to occur to a greater extent. Catalyst characterization by TPR, X-ray diffraction and XPS revealed that PdZn alloys can be formed upon reduction of Pd/ZnO catalysts at moderate temperatures. (C) 1998 Elsevier Science B.V.