Decomposition of chlorofluorocarbons over metal phosphate catalysis. II. Origin of the stability of AlPO4 and the location of CE as a promoter

Yusaku Takita, Hironori Wakamatsu, Gong Liang Li, Yoshihiko Moro-Oka, Hiroyasu Nishiguchi, Tatsumi Ishihara

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Aluminum-phosphate catalysts prepared from aqueous solution of Al(NO3)36H2O and H3PO4 in acidic condition are effective for hydrolysis of CCl2F2. Active species of the AlPO4 catalysts were studied and it was found that not Al(PO3)3 but pure AlPO4 was active. AlPO4 was amorphous when calcined at 1000°C for 5 h. But a slight crystallization of AlPO4 took place after the reaction at 400°C for 1000 h. Crystallization of AlPO4 proceeded only in the presence of both CCl2F2 and water vapor. Replacement of 5-10 at.% of Al in AlPO4 by Ce increased the catalytic activity without changing the selectivity. The Ce-promoted catalysts were composed of the mixture of AlPO4 and CePO4. The compositions of the catalysts were the same as those of parent liquor in preparation and it was almost uniform in the surface and the bulk. AlPO4 in the Ce-promoted AlPO4 catalyst was partially crystallized after the calcination at 1000°C for 5 h. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)111-119
Number of pages9
JournalJournal of Molecular Catalysis A: Chemical
Volume155
Issue number1-2
DOIs
Publication statusPublished - Apr 20 2000
Externally publishedYes

Fingerprint

Chlorofluorocarbons
chlorofluorocarbons
Catalysis
catalysis
phosphates
Phosphates
Metals
Decomposition
decomposition
catalysts
Catalysts
metals
Crystallization
crystallization
Catalyst selectivity
Steam
Calcination
roasting
Water vapor
hydrolysis

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

Cite this

Decomposition of chlorofluorocarbons over metal phosphate catalysis. II. Origin of the stability of AlPO4 and the location of CE as a promoter. / Takita, Yusaku; Wakamatsu, Hironori; Li, Gong Liang; Moro-Oka, Yoshihiko; Nishiguchi, Hiroyasu; Ishihara, Tatsumi.

In: Journal of Molecular Catalysis A: Chemical, Vol. 155, No. 1-2, 20.04.2000, p. 111-119.

Research output: Contribution to journalArticle

Takita, Yusaku ; Wakamatsu, Hironori ; Li, Gong Liang ; Moro-Oka, Yoshihiko ; Nishiguchi, Hiroyasu ; Ishihara, Tatsumi. / Decomposition of chlorofluorocarbons over metal phosphate catalysis. II. Origin of the stability of AlPO4 and the location of CE as a promoter. In: Journal of Molecular Catalysis A: Chemical. 2000 ; Vol. 155, No. 1-2. pp. 111-119.
@article{315ab9fa052e428bae40dc8b21966585,
title = "Decomposition of chlorofluorocarbons over metal phosphate catalysis. II. Origin of the stability of AlPO4 and the location of CE as a promoter",
abstract = "Aluminum-phosphate catalysts prepared from aqueous solution of Al(NO3)36H2O and H3PO4 in acidic condition are effective for hydrolysis of CCl2F2. Active species of the AlPO4 catalysts were studied and it was found that not Al(PO3)3 but pure AlPO4 was active. AlPO4 was amorphous when calcined at 1000°C for 5 h. But a slight crystallization of AlPO4 took place after the reaction at 400°C for 1000 h. Crystallization of AlPO4 proceeded only in the presence of both CCl2F2 and water vapor. Replacement of 5-10 at.{\%} of Al in AlPO4 by Ce increased the catalytic activity without changing the selectivity. The Ce-promoted catalysts were composed of the mixture of AlPO4 and CePO4. The compositions of the catalysts were the same as those of parent liquor in preparation and it was almost uniform in the surface and the bulk. AlPO4 in the Ce-promoted AlPO4 catalyst was partially crystallized after the calcination at 1000°C for 5 h. (C) 2000 Elsevier Science B.V.",
author = "Yusaku Takita and Hironori Wakamatsu and Li, {Gong Liang} and Yoshihiko Moro-Oka and Hiroyasu Nishiguchi and Tatsumi Ishihara",
year = "2000",
month = "4",
day = "20",
doi = "10.1016/S1381-1169(99)00324-6",
language = "English",
volume = "155",
pages = "111--119",
journal = "Journal of Molecular Catalysis A: Chemical",
issn = "1381-1169",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Decomposition of chlorofluorocarbons over metal phosphate catalysis. II. Origin of the stability of AlPO4 and the location of CE as a promoter

AU - Takita, Yusaku

AU - Wakamatsu, Hironori

AU - Li, Gong Liang

AU - Moro-Oka, Yoshihiko

AU - Nishiguchi, Hiroyasu

AU - Ishihara, Tatsumi

PY - 2000/4/20

Y1 - 2000/4/20

N2 - Aluminum-phosphate catalysts prepared from aqueous solution of Al(NO3)36H2O and H3PO4 in acidic condition are effective for hydrolysis of CCl2F2. Active species of the AlPO4 catalysts were studied and it was found that not Al(PO3)3 but pure AlPO4 was active. AlPO4 was amorphous when calcined at 1000°C for 5 h. But a slight crystallization of AlPO4 took place after the reaction at 400°C for 1000 h. Crystallization of AlPO4 proceeded only in the presence of both CCl2F2 and water vapor. Replacement of 5-10 at.% of Al in AlPO4 by Ce increased the catalytic activity without changing the selectivity. The Ce-promoted catalysts were composed of the mixture of AlPO4 and CePO4. The compositions of the catalysts were the same as those of parent liquor in preparation and it was almost uniform in the surface and the bulk. AlPO4 in the Ce-promoted AlPO4 catalyst was partially crystallized after the calcination at 1000°C for 5 h. (C) 2000 Elsevier Science B.V.

AB - Aluminum-phosphate catalysts prepared from aqueous solution of Al(NO3)36H2O and H3PO4 in acidic condition are effective for hydrolysis of CCl2F2. Active species of the AlPO4 catalysts were studied and it was found that not Al(PO3)3 but pure AlPO4 was active. AlPO4 was amorphous when calcined at 1000°C for 5 h. But a slight crystallization of AlPO4 took place after the reaction at 400°C for 1000 h. Crystallization of AlPO4 proceeded only in the presence of both CCl2F2 and water vapor. Replacement of 5-10 at.% of Al in AlPO4 by Ce increased the catalytic activity without changing the selectivity. The Ce-promoted catalysts were composed of the mixture of AlPO4 and CePO4. The compositions of the catalysts were the same as those of parent liquor in preparation and it was almost uniform in the surface and the bulk. AlPO4 in the Ce-promoted AlPO4 catalyst was partially crystallized after the calcination at 1000°C for 5 h. (C) 2000 Elsevier Science B.V.

UR - http://www.scopus.com/inward/record.url?scp=0034690087&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034690087&partnerID=8YFLogxK

U2 - 10.1016/S1381-1169(99)00324-6

DO - 10.1016/S1381-1169(99)00324-6

M3 - Article

AN - SCOPUS:0034690087

VL - 155

SP - 111

EP - 119

JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

SN - 1381-1169

IS - 1-2

ER -