Influence of the reduction temperature on catalytic activity of Co/TiO 2 (anatase-type) for high pressure dry reforming of methane

Katsutoshi Nagaoka, Kazuhiro Takanabe, Ken Ichi Aika*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

0.5 wt.% Co/TiO2 was prepared by incipient wetness impregnation with Co(NO3)2·6H2O and TiO2, which contains only anatase as crystal structure. The influence of reduction temperature (973-1223 K) on the catalytic activity of the 0.5 wt.% Co/TiO 2 was investigated for the CH4/CO2 reaction under 2.0 MPa mainly at a space velocity (SV) of 6000 mlg-1h -1. Co/TiO2 reduced below 1123K lost its activity completely at the beginning of the reaction. The results of TPO revealed that large amounts of coke (≧2.9wt.% carbon for 24 h) were deposited on the catalysts during the CH4/CO2 reaction. On the other hand, Co/TiO2 reduced at and above 1123 K kept relatively stable activity for 24h and did not show significant amounts of deposited coke (≦0.25 wt.% carbon). The natures causing different catalytic behavior among the catalysts were discussed with the results of TEM, XRD, and TPR. In addition, slow deactivation of the Co/TiO2 reduced at 1123K, probably due to the oxidation of the metallic cobalt, was inhibited by the addition of small amount of ruthenium (Ru/Co = 0.05) and it was found that the strong resistance to the coking of the Co/TiO2 reduced at 1123K was retained after the addition of ruthenium.

Original languageEnglish (US)
Pages (from-to)13-21
Number of pages9
JournalApplied Catalysis A: General
Volume255
Issue number1
DOIs
StatePublished - Nov 28 2003

Keywords

  • Addition of ruthenium
  • Co/TiO
  • High pressure
  • Hydrogen production
  • Influence of reduction temperature
  • Methane dry reforming
  • Strong resistance to coking

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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