Abstract
Decomposition of CCl4, CCl2F2, CClF3, and CF4 was studied in the presence of water vapor over AlPO4. They began to decompose at about 300, 330, 450, and 550°C, respectively. A good linear relationship between the reactivity of CFCs and the bond dissociation energy of the C-Cl bond suggests that the C-Cl bond cleavage is the rate-determining step. The lattice structure of AlPO4 before reaction was slightly distorted but the environment of Al and P ions became uniform after the reaction, consistent with a slight progress of crystallization of AlPO4. Supporting AlPO4 onto active charcoal is not preferable to the support because of its reactivity to water vapor. ALPO-5 was less active than that AlPO4 because the inside of the pores of ALPO-5 is hydrophobic and not effective for the CCl2F2 decomposition. Meso-porous AlPO4 showed almost the same activity with AlPO4, but the destruction of the meso-porous structure brought about a loss of activity at 400°C.
| Original language | English |
|---|---|
| Pages (from-to) | 55-61 |
| Number of pages | 7 |
| Journal | Applied Catalysis A: General |
| Volume | 194 |
| DOIs | |
| Publication status | Published - Mar 13 2000 |
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All Science Journal Classification (ASJC) codes
- Catalysis
- Process Chemistry and Technology
Cite this
Decomposition of chlorofluorocarbons over metal phosphate catalysts III. Reaction path of CCl2F2 decomposition over AlPO4. / Takita, Yusaku; Wakamatsu, Hironori; Tokumaru, Masami; Nishiguchi, Hiroyasu; Ito, Masami; Ishihara, Tatsumi.
In: Applied Catalysis A: General, Vol. 194, 13.03.2000, p. 55-61.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Decomposition of chlorofluorocarbons over metal phosphate catalysts III. Reaction path of CCl2F2 decomposition over AlPO4
AU - Takita, Yusaku
AU - Wakamatsu, Hironori
AU - Tokumaru, Masami
AU - Nishiguchi, Hiroyasu
AU - Ito, Masami
AU - Ishihara, Tatsumi
PY - 2000/3/13
Y1 - 2000/3/13
N2 - Decomposition of CCl4, CCl2F2, CClF3, and CF4 was studied in the presence of water vapor over AlPO4. They began to decompose at about 300, 330, 450, and 550°C, respectively. A good linear relationship between the reactivity of CFCs and the bond dissociation energy of the C-Cl bond suggests that the C-Cl bond cleavage is the rate-determining step. The lattice structure of AlPO4 before reaction was slightly distorted but the environment of Al and P ions became uniform after the reaction, consistent with a slight progress of crystallization of AlPO4. Supporting AlPO4 onto active charcoal is not preferable to the support because of its reactivity to water vapor. ALPO-5 was less active than that AlPO4 because the inside of the pores of ALPO-5 is hydrophobic and not effective for the CCl2F2 decomposition. Meso-porous AlPO4 showed almost the same activity with AlPO4, but the destruction of the meso-porous structure brought about a loss of activity at 400°C.
AB - Decomposition of CCl4, CCl2F2, CClF3, and CF4 was studied in the presence of water vapor over AlPO4. They began to decompose at about 300, 330, 450, and 550°C, respectively. A good linear relationship between the reactivity of CFCs and the bond dissociation energy of the C-Cl bond suggests that the C-Cl bond cleavage is the rate-determining step. The lattice structure of AlPO4 before reaction was slightly distorted but the environment of Al and P ions became uniform after the reaction, consistent with a slight progress of crystallization of AlPO4. Supporting AlPO4 onto active charcoal is not preferable to the support because of its reactivity to water vapor. ALPO-5 was less active than that AlPO4 because the inside of the pores of ALPO-5 is hydrophobic and not effective for the CCl2F2 decomposition. Meso-porous AlPO4 showed almost the same activity with AlPO4, but the destruction of the meso-porous structure brought about a loss of activity at 400°C.
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U2 - 10.1016/S0926-860X(99)00353-1
DO - 10.1016/S0926-860X(99)00353-1
M3 - Article
AN - SCOPUS:0033687432
VL - 194
SP - 55
EP - 61
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
ER -