کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
46181 | 46433 | 2012 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis of Pt-Cu/SiO2 catalysts with different structures and their application in hydrodechlorination of 1,2-dichloroethane Synthesis of Pt-Cu/SiO2 catalysts with different structures and their application in hydrodechlorination of 1,2-dichloroethane](/preview/png/46181.png)
Pt-Cu/SiO2 catalysts with different structures and chemical compositions were prepared using a two-step method. For the series of PtxCu100−x/SiO2 catalysts, Pt was deposited in the first step with H2PtCl6 as the precursor and Cu was deposited subsequently with Cu(NH3)42+ as the precursor. For the Cu100−xPtx/SiO2 catalyst, the deposition sequence was reversed accompanied with galvanic displacement of Cu0 by Pt4+. All the samples were characterized by XRD, TEM, H2-TPR, H2 chemisorption, and DRIFT of CO adsorption, and evaluated for the catalytic hydrodechlorination of 1,2-dichloroethane. The results show that the PtxCu100−x/SiO2 catalysts exhibit core–shell structures with Pt-rich alloy cores and Cu-rich alloy shells, while the Cu100−xPtx/SiO2 catalyst shows a Pt–Cu alloy core and a Pt rich alloy shell. Different structures and chemical compositions lead to quite different performances in catalyzing the hydrodechlorination of 1,2-dichloroethane. The Pt16Cu84/SiO2 catalyst gave a high selectivity to ethylene over 90% and an excellent stability over 18 h run due to the Cu-rich shell structure, while the Cu44Pt56/SiO2 catalyst produced predominantly ethane due to the Pt rich shell.
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► Pt-Cu/SiO2 catalysts with core–shell structures.
► Controllable particle sizes and chemical compositions.
► High selectivity to ethylene for hydrodechlorination of 1,2-dichloroethane.
Journal: Applied Catalysis B: Environmental - Volumes 121–122, 13 June 2012, Pages 105–114