Journal
APPLIED CATALYSIS A-GENERAL
Volume 401, Issue 1-2, Pages 12-19Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2011.04.048
Keywords
Acetylene hydrogenation; Pd; Cu; Surface redox method; Ethylene selectivity
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Funding
- BASF Aktiengesellschaft, Germany
- Brain Korea 32 project
- Korea Science and Engineering Foundation (KOSEF) through the National Research Laboratory
- Korea government Ministry of Knowledge Economy [20104010100510]
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Cu-promoted Pd/Al2O3 catalysts were prepared by selectively depositing Cu onto the Pd surface using a surface redox (SR) method, and their performance in the selective hydrogenation of acetylene was compared with that of Ag-promoted catalysts prepared by both the SR and the conventional impregnation method. The Cu-promoted catalysts prepared by SR showed higher ethylene selectivity and activity than Ag-promoted catalysts, particularly with small amounts of added promoter. The above results were obtained because Cu added by SR was deposited preferentially onto the low-coordination sites of Pd, which were detrimental to ethylene selectivity but took a small fraction of the Pd surface that was responsible for acetylene conversion, and also because Cu had an intrinsic activity for hydrogenation. The advantages of Cu-promoted catalysts prepared using Cu as a promoter and the SR process as the promoter-addition method were conclusively demonstrated in the present study. (C) 2011 Elsevier B.V. All rights reserved.
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