Dimethyl methylphosphonate decomposition on fully oxidized and partially reduced ceria thin films

Chen, Donna; Ratliff, Jay S.; Hu, Xiaofeng; Gordon, Wesley O.; Senanayake, Sanjaya D.; Mullins, David R.

doi:10.1016/j.susc.2009.12.028

Cited by 71 publications

(133 citation statements)

References 65 publications

Supporting

Mentioning

117

Contrasting

Order By: Relevance

“…The Mo 5+ shoulder in the Mo 3d spectrum has become slightly more prominent at 573 K, seen in Figure 6(b). Significantly more PO x results in a peak on the high binding energy side of the O 1s spectra in Figure 6(a), matching previous results of decomposed DMMP on CeO 2 [21]. Overall, the higher DMMP coverage resulted in more products and their accumulation upon heating in 10 mTorr of DMMP.…”

Section: Discussionsupporting

confidence: 86%

“…The O 1s binding energy of the methoxy group is about 532.8 eV. The appearance of the phosphoryl group overlaps with other DMMP decomposition studies, such as methanol (32 amu) [20], dimethyl ether (46 amu) [21,22], methane (16 amu) [20,21] or H 2 [20,21], strongly implying intact desorption under these conditions.…”

Section: Low Dmmp Coverage -Heating In Vacuumsupporting

confidence: 75%

“…While intact desorption is observed on SiO 2 [28], decomposition is more extensive on TiO 2 [21] and CeO 2 [21] when heating in vacuum after exposure to a saturating dose of DMMP. On TiO 2 , H 2 , and CH 4 have been detected using TPD, and PO x and PCH x decomposition products were observed by XPS [21]. More extensive decomposition on CeO 2 films results in desorption of methanol, formaldehyde, water, H 2 , and CO, and the accumulation of PO x , PCH x , and CeOCH 3 [21].…”

Section: Discussionmentioning

confidence: 98%

“…DMMP has been found to adsorb onto several metal oxides, including Al 2 O 3 [5,9,26,27], Fe 2 O 3 [9], MgO [5,9], ZnO [5], La 2 O 3 [9], SiO 2 [28,29], TiO 2 [5,21], CeO 2 [7,21], and WO 3 [5]. Of these, intact adsorption at room temperature occurs on TiO 2 [21], CeO 2 [21], and SiO 2 [28,29].…”

Section: Discussionmentioning

confidence: 99%

“…Of these, intact adsorption at room temperature occurs on TiO 2 [21], CeO 2 [21], and SiO 2 [28,29]. While intact desorption is observed on SiO 2 [28], decomposition is more extensive on TiO 2 [21] and CeO 2 [21] when heating in vacuum after exposure to a saturating dose of DMMP. On TiO 2 , H 2 , and CH 4 have been detected using TPD, and PO x and PCH x decomposition products were observed by XPS [21].…”

Section: Discussionmentioning

confidence: 99%

See 4 more Smart Citations

Thermal desorption of dimethyl methylphosphonate from MoO₃

Head

Tang

Hicks

et al. 2017

Catalysis, Structure & Reactivity

View full text Add to dashboard Cite

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 MoO 3 , 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 MoO 3 , 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 MoO 3 surface. Heating under mTorr partial pressures of DMMP results in product accumulation.

show abstract

Section: Discussionsupporting

confidence: 86%

Section: Low Dmmp Coverage -Heating In Vacuumsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Thermal desorption of dimethyl methylphosphonate from MoO₃

Head

Tang

Hicks

et al. 2017

Catalysis, Structure & Reactivity

View full text Add to dashboard Cite

show abstract

Adsorption and Decomposition of DMMP on Size‐Selected (WO₃)₃ Clusters

et al. 2018

View full text Add to dashboard Cite

The adsorption and decomposition behaviors of dimethyl methylphosphate (DMMP) on size‐selected (WO3)3 clusters were studied by a combination of X‐ray Photoelectron Spectroscopy (XPS) and Temperature Programmed Reaction (TPR). The fate of DMMP adsorbed on (WO3)3 clusters was found to be very similar to its fate on (MoO3)3. In contrast to DMMP on (MoO3)3, however, dimethyl ether was observed as a product in the reaction of DMMP with (WO3)3, in addition to methanol, due to the higher Lewis acidity of (WO3)3 clusters as compared to (MoO3)3.

show abstract