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Facile Decomposition of Organophosphonates by Dual Lewis Sites on a Fe3O4(111) Film

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3];  [2];  [4];  [5]
  1. Harvard Univ., Cambridge, MA (United States). Dept. of Chemistry & Chemical Biology; OSTI
  2. Harvard Univ., Cambridge, MA (United States). Dept. of Chemistry & Chemical Biology
  3. Univ. of California, Los Angeles, CA (United States). Chemical and Biomolecular Engineering Dept.
  4. Univ. of California, Los Angeles, CA (United States). Chemical and Biomolecular Engineering Dept. Chemistry and Biochemistry Dept.
  5. Harvard Univ., Cambridge, MA (United States). Dept. of Chemistry & Chemical Biology. John A. Paulson School of Engineering and Applied Sciences

Dimethyl methylphosphonate (DMMP) is used as a simulant for toxic nerve agents and pesticides, rendering the understanding of surface chemistry requisite to design effective materials for organophosphonate (catalytic) decomposition at room temperature. In this work, DMMP surface chemistry is studied on an iron oxide surface in a very well-defined environment using temperature-programmed reaction, isotopic labeling, scanning tunneling microscopy, X-ray photoelectron spectroscopy, and density functional theory. DMMP, (CH3O)2P(O)(CH3), dissociates to yield methoxy and methyl methylphosphonate, (CH3O)P(O)2(CH3), on the surface at room temperature. At higher temperatures, dimethyl ether is formed via intramolecular reaction, followed by the formation of formaldehyde and methanol from adsorbed methoxy decomposition during temperature-programmed reaction. Ultimately, stochiometric combustion at 870 K produces CO, H2C=O, and CO2 via reaction with lattice oxygen, with POx remaining on the surface. Excess oxygen from the bulk is required to drive these higher temperature pathways. Neither hydrolysis nor a photoreaction is observed, when exposing the adsorbed DMMP to water or light above the band gap, respectively. No evolution of P-containing species is detected, indicating efficient trapping of this contaminant. The activity for DMMP decomposition at room temperature is reduced by the accumulation of POx. However, a significant amount of reaction persists after multiple temperature-programmed reaction experiments.

Research Organization:
Harvard Univ., Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012573; SC0012704
OSTI ID:
1802398
Alternate ID(s):
OSTI ID: 1843927
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 23 Vol. 124; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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