Pt-Rh/TiO2/activated carbon as highly active and stable HI decomposition catalyst for hydrogen production in sulfur-iodine (SI) process

Wachirapun Punkrawee, Azusa Yamanaka, Junko Matsuda, Yukiko Mitoma, Noriko Nishiyama, Tatsumi Ishihara

Research output: Contribution to journalArticle

Abstract

Pt-TiO2 loaded on activated carbon was studied as an active and stable catalyst to HI decomposition for H2 formation in the sulfur-iodine process. Although the activity of TiO2-loaded catalyst was slightly lower HI conversion than that of CeO2 loaded one, the higher stability against HI decomposition reaction was achieved and almost equilibrium conversion was sustained over ~65 h examined. Moreover, effects of Rh or Ir addition on HI conversion were studied and it was found that Pt-Rh bimetallic system was highly active and stable to HI decomposition. Scanning transmission electron micrograph observation suggested that the increased HI decomposition activity was assigned to the increased dispersion of Pt particles. High dispersion state of Pt was sustained after HI decomposition at 773 K by addition of Rh. Since the formation of PtI4 was suggested by X-ray photoelectron spectroscopy measurement during HI decomposition, increased stability by addition of Rh seems to be assigned to the high chemical stability of Rh against iodine. Almost the equilibrium HI conversion on Pt-Rh-TiO2/M563 was sustained over 300 hours at 673 K.

Original languageEnglish
Pages (from-to)2494-2506
Number of pages13
JournalInternational Journal of Energy Research
Volume42
Issue number7
DOIs
Publication statusPublished - Jun 10 2018

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Hydrogen production
Iodine
Activated carbon
Sulfur
Decomposition
Catalysts
Chemical stability
X ray photoelectron spectroscopy
Scanning
Electrons

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Pt-Rh/TiO2/activated carbon as highly active and stable HI decomposition catalyst for hydrogen production in sulfur-iodine (SI) process. / Punkrawee, Wachirapun; Yamanaka, Azusa; Matsuda, Junko; Mitoma, Yukiko; Nishiyama, Noriko; Ishihara, Tatsumi.

In: International Journal of Energy Research, Vol. 42, No. 7, 10.06.2018, p. 2494-2506.

Research output: Contribution to journalArticle

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AU - Matsuda, Junko

AU - Mitoma, Yukiko

AU - Nishiyama, Noriko

AU - Ishihara, Tatsumi

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AB - Pt-TiO2 loaded on activated carbon was studied as an active and stable catalyst to HI decomposition for H2 formation in the sulfur-iodine process. Although the activity of TiO2-loaded catalyst was slightly lower HI conversion than that of CeO2 loaded one, the higher stability against HI decomposition reaction was achieved and almost equilibrium conversion was sustained over ~65 h examined. Moreover, effects of Rh or Ir addition on HI conversion were studied and it was found that Pt-Rh bimetallic system was highly active and stable to HI decomposition. Scanning transmission electron micrograph observation suggested that the increased HI decomposition activity was assigned to the increased dispersion of Pt particles. High dispersion state of Pt was sustained after HI decomposition at 773 K by addition of Rh. Since the formation of PtI4 was suggested by X-ray photoelectron spectroscopy measurement during HI decomposition, increased stability by addition of Rh seems to be assigned to the high chemical stability of Rh against iodine. Almost the equilibrium HI conversion on Pt-Rh-TiO2/M563 was sustained over 300 hours at 673 K.

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