Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 125, Issue -, Pages 172-179Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2012.05.016
Keywords
Catalytic hydrodechlorination; 1,2-Dichloroethane; Ethylene selectivity; Pt-Ag/TiO2 catalyst; Sequential photodeposition
Funding
- Natural Science Foundation of China [21107043, 20877039]
- Program of New Century Excellent Talents in University [NECT-08-0277]
- Natural Science Foundation of Jiangsu Province, China [BK2010378, BK2010051]
- Special of Foundation for the Doctor-subject of China [20100091120016]
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TiO2 supported Pt-Ag bimetallic catalysts were prepared using a sequential photodeposition method (denoted as pd-Pt-Ag/TiO2). For comparison, supported bimetallic catalysts were also prepared using the conventional impregnation method (denoted as im-Pt-Ag/TiO2). The catalysts were characterized by X-ray diffraction, transition electron microscopy, CO chemisorption, IR spectroscopy of CO adsorption, and X-ray photoelectron spectroscopy. Characterization results indicated that photodeposition led to site-specific deposition of metallic Ag domain on the surface of Pt particles and thus to the formation of core-shell (Pt@Ag) like bimetallic species, which effectively blocked the adjacent Pt sites. However, Pt-Ag ensemble was predominant in im-Pt-Ag/TiO2. Accordingly, hydrodechlorination of 1,2-dichloroethane exhibited substantially higher ethylene selectivity and catalytic stability on pd-Pt-Ag/TiO2 than on fm-Pt-Ag/TiO2 at similar Ag loading levels. Findings from this study highlight the potential of using sequentially photodeposited core-shell like bimetallic catalysts to enhance the ethylene selectivity in hydrodechlorination of 1,2-dichloroethane. (C) 2012 Elsevier B.V. All rights reserved.
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