Methanol oxidative decomposition over zirconia supported silver catalyst and its reaction mechanism

Naohiro Shimoda, Shota Umehara, Masaki Kasahara, Teruhisa Hongo, Atsushi Yamazaki, Shigeo Satokawa

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

To develop a new catalyst for catalytic decomposition of volatile organic compounds (VOCs), the activity of various oxide supported silver (Ag) based catalysts for methanol (MeOH) oxidation reaction have been evaluated. Based on the activity evaluation, zirconia (ZrO2) is considered to be a substitute to ceria (CeO2) as a support material. The ZrO2 supported catalyst loading Ag component can oxidize MeOH to CO2 completely, while the main product is CO for MeOH oxidation over pure ZrO2. In the present work, 2.0 wt.% Ag/ZrO2 exhibits excellent activity comparable to Ag/CeO2. Furthermore, according to in situ FT-IR analysis over Ag/ZrO2 and pure ZrO2, it is considered that the methoxy, formate, and bicarbonate species adsorbed on the ZrO2 surface are intermediate species. We thus deduce that Ag component significantly enhances the oxidation step of methoxy species to CO2 via formate species, leading to the complete oxidation of MeOH to CO2 over Ag/ZrO2 catalyst.

Original languageEnglish
Article number15549
Pages (from-to)56-64
Number of pages9
JournalApplied Catalysis A: General
Volume507
DOIs
Publication statusPublished - 2015 Oct 25

Keywords

  • Ag catalyst
  • FTIR
  • Methanol oxidation
  • VOCs
  • Zirconia

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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