Decomposition of CCl2F2 over metal sulfate catalysts

Yusaku Takita; Jun Ichi Moriyama; Hiroyasu Nishiguchi; Tatsumi Ishihara; Fusakazu Hayano; Tetsuo Nakajo

doi:10.1016/j.cattod.2003.11.003

Decomposition of CCl₂F₂ over metal sulfate catalysts

Yusaku Takita, Jun Ichi Moriyama, Hiroyasu Nishiguchi, Tatsumi Ishihara, Fusakazu Hayano, Tetsuo Nakajo

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

Activity for hydrolysis of CCl₂F₂ (CFC12) on various metal sulfate was investigated. Zr(SO₄)₂ was found to be the most active while FeSO₄, Cr₂(SO₄) ₃, Al₂(SO₄)₃, La₂(SO ₄)₃ and Ce₂(SO₄)₃ had intermediate activity. MnSO₄, CoSO₄, and MgSO₄ showed low activity and SrSO₄, CaSO₄, and BaSO ₄ had even less activity. The major carbon containing product was CO₂ and small amount of CClF₃ and CO were formed over several sulfates. The crystal structure of the sulfates was stable during decomposition of CCl₂F₂, and the conversion reached a steady state after initial decrease at 275 °C over Zr(SO₄) ₂ catalyst. The concentration of surface hydroxyl was larger than that over AlPO₄-based catalysts and a reaction mechanism similar to that over AlPO₄-based catalysts was proposed.

Original language	English
Pages (from-to)	103-109
Number of pages	7
Journal	Catalysis Today
Volume	88
Issue number	3-4
DOIs	https://doi.org/10.1016/j.cattod.2003.11.003
Publication status	Published - Feb 15 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

Catalysis
Chemistry(all)

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10.1016/j.cattod.2003.11.003

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title = "Decomposition of CCl2F2 over metal sulfate catalysts",

abstract = "Activity for hydrolysis of CCl2F2 (CFC12) on various metal sulfate was investigated. Zr(SO4)2 was found to be the most active while FeSO4, Cr2(SO4) 3, Al2(SO4)3, La2(SO 4)3 and Ce2(SO4)3 had intermediate activity. MnSO4, CoSO4, and MgSO4 showed low activity and SrSO4, CaSO4, and BaSO 4 had even less activity. The major carbon containing product was CO2 and small amount of CClF3 and CO were formed over several sulfates. The crystal structure of the sulfates was stable during decomposition of CCl2F2, and the conversion reached a steady state after initial decrease at 275 °C over Zr(SO4) 2 catalyst. The concentration of surface hydroxyl was larger than that over AlPO4-based catalysts and a reaction mechanism similar to that over AlPO4-based catalysts was proposed.",

author = "Yusaku Takita and Moriyama, {Jun Ichi} and Hiroyasu Nishiguchi and Tatsumi Ishihara and Fusakazu Hayano and Tetsuo Nakajo",

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T1 - Decomposition of CCl2F2 over metal sulfate catalysts

AU - Takita, Yusaku

AU - Moriyama, Jun Ichi

AU - Nishiguchi, Hiroyasu

AU - Ishihara, Tatsumi

AU - Hayano, Fusakazu

AU - Nakajo, Tetsuo

PY - 2004/2/15

Y1 - 2004/2/15

N2 - Activity for hydrolysis of CCl2F2 (CFC12) on various metal sulfate was investigated. Zr(SO4)2 was found to be the most active while FeSO4, Cr2(SO4) 3, Al2(SO4)3, La2(SO 4)3 and Ce2(SO4)3 had intermediate activity. MnSO4, CoSO4, and MgSO4 showed low activity and SrSO4, CaSO4, and BaSO 4 had even less activity. The major carbon containing product was CO2 and small amount of CClF3 and CO were formed over several sulfates. The crystal structure of the sulfates was stable during decomposition of CCl2F2, and the conversion reached a steady state after initial decrease at 275 °C over Zr(SO4) 2 catalyst. The concentration of surface hydroxyl was larger than that over AlPO4-based catalysts and a reaction mechanism similar to that over AlPO4-based catalysts was proposed.

AB - Activity for hydrolysis of CCl2F2 (CFC12) on various metal sulfate was investigated. Zr(SO4)2 was found to be the most active while FeSO4, Cr2(SO4) 3, Al2(SO4)3, La2(SO 4)3 and Ce2(SO4)3 had intermediate activity. MnSO4, CoSO4, and MgSO4 showed low activity and SrSO4, CaSO4, and BaSO 4 had even less activity. The major carbon containing product was CO2 and small amount of CClF3 and CO were formed over several sulfates. The crystal structure of the sulfates was stable during decomposition of CCl2F2, and the conversion reached a steady state after initial decrease at 275 °C over Zr(SO4) 2 catalyst. The concentration of surface hydroxyl was larger than that over AlPO4-based catalysts and a reaction mechanism similar to that over AlPO4-based catalysts was proposed.

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DO - 10.1016/j.cattod.2003.11.003

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JO - Catalysis Today

JF - Catalysis Today

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ER -

Decomposition of CCl₂F₂ over metal sulfate catalysts

Abstract

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