Performance of Cu-promoted Pd catalysts prepared by adding Cu using a surface redox method in acetylene hydrogenation

Seok Ki Kim, Ji Hoon Lee, In Young Ahn, Woo Jae Kim, Sang Heup Moon

Research output: Contribution to journalArticlepeer-review

89 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)12-19
Number of pages8
JournalApplied Catalysis A: General
Volume401
Issue number1-2
DOIs
StatePublished - 15 Jul 2011

Keywords

  • Acetylene hydrogenation
  • Cu
  • Ethylene selectivity
  • Pd
  • Surface redox method

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