Catalytic Oxidative Decomposition of Dimethyl Methylphosphonate over Cu-Substituted Hydroxyapatite

Kwan Young Lee, M. Houalla, D. M. Hercules, W. K. Hall

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

The oxidative decomposition of dimethyl methyiphosphonate (DMMP) has been studied over Cu-substituted hydroxyapatite catalysts in a flow reactor in the temperature range 373-773 K. By substitution of a portion of the Ca2+ by Cu2+ in the hydroxyapatite lattice, the catalytic activity was markedly increased. The composition Cu2Ca8(PO4)6(OH)2, herein called Cu2-HA, had the highest activity among these catalysts. All the catalysts showed 100% conversion at the beginning of the reaction, but became deactivated after a period of time. Only CO2 and H2O were produced during the "protection period" of the 100% conversion. With deactivation, CO2 formation decreased and methanol and dimethyl ether appeared as products. A phosphorus-containing product was not detected in the gas phase. Some condensate of phosphoric acid appeared in the outlet of the reactor after deactivation. Several analytical methods revealed that carbonaceous compounds did not remain on the surface after 773-K oxidative regeneration, but the phosphorus compounds that had accumulated during the reaction were not eliminated. The catalytic activity of Cu-substituted hydroxyapatite was compared to that of conventional supported Pt catalysts. This study suggested that easily made and cheap Cu-substituted hydroxyapatite catalysts could be used as successful alternatives to conventional adsorbents and catalytic systems based on supported noble metals devised for protection against nerve gases in warfare.

Original languageEnglish
Pages (from-to)223-231
Number of pages9
JournalJournal of Catalysis
Volume145
Issue number1
DOIs
Publication statusPublished - 1994 Jan 1
Externally publishedYes

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Durapatite
Hydroxyapatite
Decomposition
decomposition
catalysts
Catalyst activity
Catalysts
deactivation
Phosphorus Compounds
Phosphorus compounds
catalytic activity
reactors
Military operations
phosphorus compounds
Phosphoric acid
warfare
Precious metals
Gases
Catalyst supports
Adsorbents

ASJC Scopus subject areas

  • Process Chemistry and Technology
  • Catalysis

Cite this

Catalytic Oxidative Decomposition of Dimethyl Methylphosphonate over Cu-Substituted Hydroxyapatite. / Lee, Kwan Young; Houalla, M.; Hercules, D. M.; Hall, W. K.

In: Journal of Catalysis, Vol. 145, No. 1, 01.01.1994, p. 223-231.

Research output: Contribution to journalArticle

Lee, Kwan Young ; Houalla, M. ; Hercules, D. M. ; Hall, W. K. / Catalytic Oxidative Decomposition of Dimethyl Methylphosphonate over Cu-Substituted Hydroxyapatite. In: Journal of Catalysis. 1994 ; Vol. 145, No. 1. pp. 223-231.
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