Metal sulfate catalyst for CCl2F2 decomposition in the presence of H2O

Junichi Moriyama; Hiroyasu Nishiguchi; Tatsumi Ishihara; Yusaku Takita

doi:10.1021/ie010334c

Metal sulfate catalyst for CCl₂F₂ decomposition in the presence of H₂O

Junichi Moriyama, Hiroyasu Nishiguchi, Tatsumi Ishihara, Yusaku Takita

Research output: Contribution to journal › Article

18 Citations (Scopus)

Abstract

Activities for the hydrolysis of CCl₂F₂ (CFC-12) on various metal sulfates were investigated in this study. It was found that Zr(SO₄)₂ exhibits a high activity for CFC-12 decomposition and a high selectivity to CO₂. On the other hand, the metal sulfates Al₂(SO₄)₃, La₂(SO₄)₃, Ce₂(SO₄)₃, and Cr₂(SO₄)₃ were also active for the hydrolysis of CFC-12. However, the activities for CFC-12 decomposition of MnSO₄, CoSO₄, and MgSO₄ were low, and decomposition of CFC-12 hardly occurred on the metal sulfates CaSO₄, SrSO₄, and BaSO₄. Among the investigated metal sulfates, Zr(SO₄)₂ was the most active, and the complete decomposition of CFC-12 was achieved at 598 K. The CFC-12 decomposition rate monotonically increased with increasing CFC-12 partial pressure. On the other hand, CFC-12 conversion became highest at an oxygen content of 18.9 mol % and a H₂O content of 5 mol %. Therefore, the main reaction on Zr(SO₄)₂ for CFC-12 decomposition into CO₂ and HCl and HF is the hydrolysis reaction. The high activity to CFC-12 decomposition on Zr(SO₄)₂ was stably sustained over the 40-h period examined. Therefore, the metal sulfate Zr(SO₄)₂ is highly active for the hydrolysis of CFC-12 and has sufficient stability against fluorination and/or chlorination.

Original language	English
Pages (from-to)	32-36
Number of pages	5
Journal	Industrial and Engineering Chemistry Research
Volume	41
Issue number	1
DOIs	https://doi.org/10.1021/ie010334c
Publication status	Published - 2002
Externally published	Yes

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Industrial and Manufacturing Engineering

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10.1021/ie010334c

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@article{0b4108e994114000bac6398457b9aab6,

title = "Metal sulfate catalyst for CCl2F2 decomposition in the presence of H2O",

abstract = "Activities for the hydrolysis of CCl2F2 (CFC-12) on various metal sulfates were investigated in this study. It was found that Zr(SO4)2 exhibits a high activity for CFC-12 decomposition and a high selectivity to CO2. On the other hand, the metal sulfates Al2(SO4)3, La2(SO4)3, Ce2(SO4)3, and Cr2(SO4)3 were also active for the hydrolysis of CFC-12. However, the activities for CFC-12 decomposition of MnSO4, CoSO4, and MgSO4 were low, and decomposition of CFC-12 hardly occurred on the metal sulfates CaSO4, SrSO4, and BaSO4. Among the investigated metal sulfates, Zr(SO4)2 was the most active, and the complete decomposition of CFC-12 was achieved at 598 K. The CFC-12 decomposition rate monotonically increased with increasing CFC-12 partial pressure. On the other hand, CFC-12 conversion became highest at an oxygen content of 18.9 mol % and a H2O content of 5 mol %. Therefore, the main reaction on Zr(SO4)2 for CFC-12 decomposition into CO2 and HCl and HF is the hydrolysis reaction. The high activity to CFC-12 decomposition on Zr(SO4)2 was stably sustained over the 40-h period examined. Therefore, the metal sulfate Zr(SO4)2 is highly active for the hydrolysis of CFC-12 and has sufficient stability against fluorination and/or chlorination.",

author = "Junichi Moriyama and Hiroyasu Nishiguchi and Tatsumi Ishihara and Yusaku Takita",

year = "2002",

doi = "10.1021/ie010334c",

language = "English",

volume = "41",

pages = "32--36",

journal = "Industrial & Engineering Chemistry Research",

issn = "0888-5885",

publisher = "American Chemical Society",

number = "1",

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T1 - Metal sulfate catalyst for CCl2F2 decomposition in the presence of H2O

AU - Moriyama, Junichi

AU - Nishiguchi, Hiroyasu

AU - Ishihara, Tatsumi

AU - Takita, Yusaku

PY - 2002

Y1 - 2002

N2 - Activities for the hydrolysis of CCl2F2 (CFC-12) on various metal sulfates were investigated in this study. It was found that Zr(SO4)2 exhibits a high activity for CFC-12 decomposition and a high selectivity to CO2. On the other hand, the metal sulfates Al2(SO4)3, La2(SO4)3, Ce2(SO4)3, and Cr2(SO4)3 were also active for the hydrolysis of CFC-12. However, the activities for CFC-12 decomposition of MnSO4, CoSO4, and MgSO4 were low, and decomposition of CFC-12 hardly occurred on the metal sulfates CaSO4, SrSO4, and BaSO4. Among the investigated metal sulfates, Zr(SO4)2 was the most active, and the complete decomposition of CFC-12 was achieved at 598 K. The CFC-12 decomposition rate monotonically increased with increasing CFC-12 partial pressure. On the other hand, CFC-12 conversion became highest at an oxygen content of 18.9 mol % and a H2O content of 5 mol %. Therefore, the main reaction on Zr(SO4)2 for CFC-12 decomposition into CO2 and HCl and HF is the hydrolysis reaction. The high activity to CFC-12 decomposition on Zr(SO4)2 was stably sustained over the 40-h period examined. Therefore, the metal sulfate Zr(SO4)2 is highly active for the hydrolysis of CFC-12 and has sufficient stability against fluorination and/or chlorination.

AB - Activities for the hydrolysis of CCl2F2 (CFC-12) on various metal sulfates were investigated in this study. It was found that Zr(SO4)2 exhibits a high activity for CFC-12 decomposition and a high selectivity to CO2. On the other hand, the metal sulfates Al2(SO4)3, La2(SO4)3, Ce2(SO4)3, and Cr2(SO4)3 were also active for the hydrolysis of CFC-12. However, the activities for CFC-12 decomposition of MnSO4, CoSO4, and MgSO4 were low, and decomposition of CFC-12 hardly occurred on the metal sulfates CaSO4, SrSO4, and BaSO4. Among the investigated metal sulfates, Zr(SO4)2 was the most active, and the complete decomposition of CFC-12 was achieved at 598 K. The CFC-12 decomposition rate monotonically increased with increasing CFC-12 partial pressure. On the other hand, CFC-12 conversion became highest at an oxygen content of 18.9 mol % and a H2O content of 5 mol %. Therefore, the main reaction on Zr(SO4)2 for CFC-12 decomposition into CO2 and HCl and HF is the hydrolysis reaction. The high activity to CFC-12 decomposition on Zr(SO4)2 was stably sustained over the 40-h period examined. Therefore, the metal sulfate Zr(SO4)2 is highly active for the hydrolysis of CFC-12 and has sufficient stability against fluorination and/or chlorination.

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