Analysis of catalytic oxidation of aromatic hydrocarbons over supported palladium catalyst with different pretreatments based on heterogeneous adsorption properties
Analysis of catalytic oxidation of aromatic hydrocarbons over supported palladium catalyst with different pretreatments based on heterogeneous adsorption properties
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DOI：
10.1016/j.apcatb.2008.03.011
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发表时间：
2008-10
影响因子：
22.1
通讯作者：
W. Shim;Jae‐Wook Lee;S. C. Kim
中科院分区：
文献类型：
--
作者：
W. Shim;Jae‐Wook Lee;S. C. Kim
研究了钯基催化剂及其预氧化和预还原催化剂对苯、甲苯和邻二甲苯（BTX）的催化氧化和吸附。采用BET比表面积分析、重量吸附分析、起燃曲线分析和X射线光电子能谱（XPS）等方法对催化剂的物化性能进行了表征和确认。催化剂的吸附和催化活性与预处理方法和温度密切相关。特别是，与母体和空气处理的催化剂相比，具有大部分金属形式的氢处理的催化剂增强了甲苯的吸附能力和催化活性。此外，采用双中心定域Langmuir（L2m）吸附等温式，成功地分析了三种温度下BTX在预还原催化剂上的吸附平衡等温线。此外，强烈的相关性之间的催化行为和BTX的吸附性能的解释方面的吸附亲和力，吸附热的等排，吸附能分布。
We investigated the catalytic oxidation and adsorption of benzene, toluene, and o-xylene (BTX) by using the palladium (Pd)-based catalyst and its pretreated (pre-oxidized and pre-reduced) catalysts. The physico-chemical properties of the catalysts were characterized and confirmed by using several reliable methods such as the Brunauer Emmett Teller (BET) surface area analysis, gravimetric adsorption analysis, light-off curves analysis, and X-ray photoelectron spectroscopy (XPS). The adsorption and catalytic activities of the catalysts were found to be closely connected with the pretreatment methods and temperatures. Especially, the hydrogen treated catalysts with a largely metallic form enhanced the adsorption ability and catalytic activity of toluene compared to that of the parent and air treated catalysts. In addition, the adsorption equilibrium isotherms of BTX on pre-reduced catalyst at three different temperatures were analyzed successfully with the two sites localized Langmuir (L2m) isotherm equation. Moreover, the strong correlations between the catalytic behavior and the adsorption properties of BTX were explained in terms of adsorption affinity, isosteric heat of adsorption, and adsorption energy distributions.