Comparative study between Zn-Pd/C and Pd/ZnO catalysts for steam reforming of methanol

Yoshinori Suwa, Shin Ichi Ito, Satoshi Kameoka, Keiichi Tomishige, Kimio Kunimori

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Catalytic activity and CO2 selectivity over carbon black-supported Pd with the addition of Zn (Zn-Pd/C) was comparable to those of Pd/ZnO in methanol steam reforming. From the characterization of fresh Zn-Pd/C after H2 reduction pretreatment by means of BET surface area, XRD, TEM and the measurement of CO adsorption, Pd-Zn alloy particles were detected on Zn-Pd/C. This is also supported by high CO2 selectivity in methanol steam reforming over Zn-Pd/C as well as Pd/ZnO. In addition, Zn-Pd/C exhibited higher stability than Pd/ZnO in methanol steam reforming. After the reaction for the life test, the formation of zinc carbonate hydroxide such as Zn 4CO3(OH)6·H2O was clearly observed on Pd/ZnO. It is expected that the deactivation is caused by covering active Pd-Zn alloy particles with zinc carbonate hydroxide. Although this phenomenon can also occur on Zn-Pd/C, the deactivation rate was much lower than Pd/ZnO because the amount of free ZnO is much smaller on Zn-Pd/C.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalApplied Catalysis A: General
Issue number1-2
Publication statusPublished - 2004 Jul 30


  • Carbon black
  • Life test
  • Methanol
  • Pd-Zn alloy
  • Steam reforming


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