Catalytic decomposition of sulfur trioxide on the binary metal oxide catalysts of Fe/Al and Fe/Ti

Tae Ho Kim, Gyeong Taek Gong, Byung Gwon Lee, Kwan Young Lee, Hee Young Jeon, Chae Ho Shin, Honggon Kim, Kwang Deog Jung

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)


The iodine-sulfur (IS) cycle has been focused for hydrogen production by water splitting using a very high temperature nuclear reactor (VHTR) which is a high temperature heat source. The nuclear energy was absorbed at the temperature ranges of 750-900 °C by SO3 decomposition reaction to SO2 and O2 in IS cycle. In this work, the activity of Fe/Al and Fe/Ti catalysts prepared by a co-precipitation was studied in an attempt to find some suitable catalysts for the decomposition of sulfur trioxide as the oxygen-generating reaction in the thermo-chemical water splitting process. The SO3 decomposition was performed in the temperature range of 750-950 °C at a space velocity of 72,000 cm3/g cat. h in a fixed bed reactor. The catalytic activity of Fe/Al and Fe/Ti catalysts increased with an increase in Fe loadings, indicating that the Fe component should be active. The mechanism for the SO3 decomposition on metal oxides can be described as follows: the metal sulfate formation (MO + SO3 → MSO4) and the decomposition of metal sulfate (MSO4 → MO2 + SO2 and MO2 → MO + 1/2O2).

Original languageEnglish
Pages (from-to)39-45
Number of pages7
JournalApplied Catalysis A: General
Issue number1
Publication statusPublished - 2006 May 17
Externally publishedYes

Bibliographical note

Funding Information:
The authors wish to acknowledge the financial support from MOST of Korea and KAERI. This work has been carried out under the Nuclear Hydrogen Development and Demonstration Project (NHDD).


  • Hydrogen production
  • IS cycle
  • Metal sulfate decomposition
  • SO decomposition

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology


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