Performance of Si-modified Pd catalyst in acetylene hydrogenation: The origin of the ethylene selectivity improvement

Eun Woo Shin, Jung Hwa Kang, Woo Jae Kim, Jae Duk Park, Sang Heup Moon

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

Supported Pd catalyst modified with Si, which is deposited selectively on Pd by silane decomposition and subsequently oxidized in oxygen, shows improved ethylene selectivity in acetylene hydrogenation. The origin of the selectivity improvement has been studied by observing the adsorption and desorption behavior of acetylene, ethylene, and hydrogen on the Pd surface. The adsorption strength of ethylene on Pd becomes weak and the amount of adsorbed hydrogen decreases when the Pd catalyst is modified with Si. The Si modification also reduces the amounts of surface hydrocarbons or carbonaceous species that are deposited on the catalyst either during the temperature-programmed desorption (TPD) of ethylene or by surface reactions between co-adsorbed acetylene and hydrogen. The hydrocarbon species deposited on the Si-modified catalyst have a shorter chain length than those produced on the Pd-only catalyst. All these results are consistent with the improvement in ethylene selectivity on the Si-modified Pd catalyst, which has been explained in this study based on the reaction mechanism of acetylene hydrogenation.

Original languageEnglish
Pages (from-to)161-172
Number of pages12
JournalApplied Catalysis A: General
Volume223
Issue number1-2
DOIs
StatePublished - 2002

Keywords

  • Acetylene hydrogenation
  • Pd catalyst
  • Promoter
  • Si

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