Relationship between adsorption properties of Pt-Cu/SiO2 catalysts and their catalytic performance for selective hydrodechlorination of 1,2-dichloroethane to ethylene

被引：20
作者：
Li, Lin [1 ]
Wang, Xiaodong [1 ]
Wang, Aiqin [1 ]
Shen, Jianyi [2 ]
Zhang, Tao [1 ]
机构：
[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
[2] Nanjing Univ, Dept Chem, Nanjing 210093, Peoples R China
来源：
THERMOCHIMICA ACTA | 2009年 / 494卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
Microcalorimetry; FTIR; Pt-Cu/SiO2; catalysts; Hydrodechlorination reaction; 1,2-Dichloroethane; COGELLED XEROGEL CATALYSTS; SOL-GEL CATALYSTS; BIMETALLIC CATALYSTS; PT-CU/C; DECHLORINATION; HYDROCARBONS; MECHANISM; METAL; CO; ETHYLIDYNE;
D O I：
10.1016/j.tca.2009.04.025
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Microcalorimetric adsorption technique was employed to study the interaction of the reactants and product in the 1,2-dichloroethane hydrodechlorination over Pt/SiO2. Cu/SiO2 and Pt-Cu/SiO2. catalysts in order to understand the high selectivity towards C2H4 on the Pt/SiO2 catalyst modified by Cu. When the adsorption properties of the reactants and product on bimetallic catalysts were compared with those on monometallic counterparts, significant differences in the strength and number of adsorption sites concerning the reactants and product were evidenced. The adsorption properties of the bimetallic catalysts could be attributed to the change in Pt surface structure modified by Cu, studied by the microcalorimetry and FTIR of CO adsorption. Relating the adsorption properties with high ethylene selectivity on bimetallic catalysts, we inferred that high ethylene selectivity on bimetallic catalysts could be attributed to the moderate adsorption and activation of reactants and product. This work gave the direct evidence of high C2H4 selectivity in 1,2-dichloroethane hydrodechlorination reaction on the Pt-Cu/SiO2 catalysts from the energetic point of view. (C) 2009 Elsevier B.V. All rights reserved.
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页码：99 / 103
页数：5
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