Title: Thermal desorption of dimethyl methylphosphonate from MoO ₃

Abstract

Organophosphonates are used as chemical warfare agents, pesticides, and corrosion inhibitors. New materials for the sorption, detection, and decomposition of these compounds are urgently needed. To facilitate materials and application innovation, a better understanding of the interactions between organophosphonates and surfaces is required. To this end, we have used diffuse reflectance infrared Fourier transform spectroscopy to investigate the adsorption geometry of dimethyl methylphosphonate (DMMP) on MoO₃, a material used in chemical warfare agent filtration devices. We further applied ambient pressure X-ray photoelectron spectroscopy and temperature programmed desorption to study the adsorption and desorption of DMMP. While DMMP adsorbs intact on MoO₃, desorption depends on coverage and partial pressure. At low coverages under UHV conditions, the intact adsorption is reversible. Decomposition occurs with higher coverages, as evidenced by PCH_x and PO_x decomposition products on the MoO₃ surface. Heating under mTorr partial pressures of DMMP results in product accumulation.

Authors:

Head, Ashley R.  ^[1];

• Search DOE PAGES for author "Head, Ashley R."
• Search DOE PAGES for ORCID "0000-0001-8733-0165"

Tang, Xin ^[2]; Hicks, Zachary ^[2]; Wang, Linjie  ^[2];

• Search DOE PAGES for author "Wang, Linjie"
• Search DOE PAGES for ORCID "0000-0001-9672-7703"

Bleuel, Hannes ^[2]; Holdren, Scott ^[3]; Trotochaud, Lena ^[1]; Yu, Yi ^[4]; Kyhl, Line ^[5]; Karslıoǧlu, Osman  ^[1];

• Search DOE PAGES for author "Karslıoǧlu, Osman"
• Search DOE PAGES for ORCID "0000-0003-4018-4572"

Fears, Kenan ^[6]; Owrutsky, Jeffrey  ^[6];

• Search DOE PAGES for author "Owrutsky, Jeffrey"
• Search DOE PAGES for ORCID "0000-0003-3216-7270"

Zachariah, Michael ^[3]; Bowen, Kit H. ^[2]; Bluhm, Hendrik ^[7]

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+ Show Author Affiliations

1. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
2. Department of Chemistry, Johns Hopkins University, Baltimore, MD, USA
3. Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, USA
4. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA, Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, USA
5. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA, iNANO, University of Aarhus, Aarhus C, Denmark
6. Chemistry Division, Naval Research Laboratory, Washington, DC, USA
7. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

Publication Date:

Fri Mar 03 00:00:00 EST 2017

Research Org.:

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1510110

Alternate Identifier(s):

OSTI ID: 1379760

Grant/Contract Number:  

AC02-05CH11231

Resource Type:

Published Article

Journal Name:

Catalysis, Structure & Reactivity

Additional Journal Information:

Journal Name: Catalysis, Structure & Reactivity Journal Volume: 3 Journal Issue: 1-2; Journal ID: ISSN 2055-074X

Publisher:

Informa UK Limited

Country of Publication:

United Kingdom

Language:

English

Subject:

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY