Performance of Ni-added Pd-Ag/Al 2O 3 catalysts in the selective hydrogenation of acetylene

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

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Effects of Ni addition on the performance of Pd-Ag/Al 2O 3 catalysts in the selective hydrogenation of acetylene were investigated. Ni-added Pd-Ag catalysts showed higher conversions than Ni-free Pd-Ag catalyst under hydrogen-deficient reaction conditions, hydrogen/acetylene <2. 0, due to the spillover of hydrogen from reduced Ni to Pd and the suppression of hydrogen penetration into the Pd bulk phase, which enriched the Pd surface with hydrogen. Ethylene selectivity was also increased by Ni addition because the amounts of surface hydrogen originating from the Pd bulk phase, which was responsible for the full hydrogenation of ethylene to ethane, were decreased due to the presence of Ni at the sub-surface of Pd-Ag particles. Added Ni also modified the geometric nature of the Pd surface by blocking large ensembles of Pd into isolated ones, which eventually improved ethylene selectivity.

Original languageEnglish
Pages (from-to)169-172
Number of pages4
JournalKorean Journal of Chemical Engineering
Volume29
Issue number2
DOIs
StatePublished - Feb 2012

Keywords

  • Acetylene Hydrogenation
  • Ag
  • Ni
  • Pd
  • Pd-hydride

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