Thermal Decomposition of Dimethyl Methylphosphonate over Manganese Oxide Catalysts

Segal, Scott R.; Cao, Lixin; Suib, Steven L.; Tang, Xia; Satyapal, Sunita

doi:10.1006/jcat.2000.3126

Cited by 39 publications

(43 citation statements)

References 22 publications

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“…Several studies were carried out to understand the mechanism of the adsorption and decomposition processes on such oxides as alumina-supported cerium oxide and iron co-impregnated oxide [31], manganese oxide [32], monoclinic tungsten oxide (m-WO 3 ) [33], cerium oxide, Fe 2 O 3 , silica [34][35][36][37][38], and TiO 2 [39][40][41][42]. The thermal oxidative decomposition study of DMMP on amorphous manganese oxide and Al 2 O 3 -supported manganese oxide catalyst has shown the DMMP oxidation to CO 2 [32]. The investigation of the adsorption of DMMP on monoclinic tungsten oxide has proven that DMMP simulant adsorbs on the surface solely through the P=O functionality with the surface water layer as well as the Lewis and Brönsted acid site [33].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of dimethyl methylphosphonate and trimethyl phosphate on calcium oxide: an ab initio study

2008

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Ab initio study of the adsorption of dimethyl methylphosphonate (DMMP) and trimethyl phosphate (TMP) on three types of models simulating the calcium oxide surface (non-hydroxylated Ca 4 O 4 , completely hydroxylated Ca 4 O 4 (OH) 2 H 2 , and partially hydroxylated Ca 4 O 4 (OH)H) was performed. The target molecule and the surface hydroxyl groups were optimized while the CaO fragment was kept frozen. The intermolecular interactions were investigated applying Bader's Atoms in Molecules theory. The maps of electrostatic potential of the studied adsorption systems were also produced. The interaction energies of studied adsorption systems corrected by the basis set superposition error were obtained. The most energetically favorable adsorption of DMMP and TMP was found at the configuration where the oxygen atoms of the P=O and methoxy groups point toward the Ca cation of the surface. The P atom points toward the O atom of the surface and forms a P-O chemical bond. This configuration was revealed for the non-hydroxylated and partially hydroxylated CaO-DMMP and CaO-TMP systems. The presence and number of surface hydroxyl groups on the CaO models play a key role in the adsorption of the studied compounds. DMMP and TMP were found to be much less stable on the completely hydroxylated CaO surface where they are adsorbed only via weak electrostatic interactions and H-bonding to the surface oxygen atoms and hydroxyl groups. TMP was found to be slightly more stable on this type of surface than DMMP. The difference in stability is even larger if one compares this TMP system with the complex of tabun adsorbed on completely hydroxylated CaO surface model (Michalkova et al. Chem Phys Lett 438:72, 2007).

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Section: Introductionmentioning

confidence: 99%

Adsorption of dimethyl methylphosphonate and trimethyl phosphate on calcium oxide: an ab initio study

2008

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“…These include the reactive deposition [7], electrochemical and thermal deposition [2,8,9], plasma assisted molecular beam epitaxy [10], r.f. sputtering [11], thermal decomposition [12], and sol-gel [13,14] derived techniques. Most of the reports address themselves to the electrochromic, electrochemical and spectroscopic performance of the films, emphasizing the inter-relation between the substrate materials, film structure and their performance in catalytic and rechargeable battery oriented applications.…”

Section: Introductionmentioning

confidence: 99%

Effects of deposition variables on spray-deposited MnO2 thin films prepared from Mn(C2H3O2)2·4H2O

Islam

Khan

2005

Renewable Energy

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“…However, after exceeding the temperature of 973 °C, an intermediate product is formed, which is methylphosphonate, as evidenced by the Fig. 2 The curves show the change in the amount of CO 2 in the gas stream during thermal decomposition of DMMP versus time of the process (reaction conditions: weight of the amorphous manganese oxide 50 mg, air flow 30 mL/min) (Segal et al 2001) Fig. 3 DMMP disposal diagram on a thin film made of cerium oxide (IV).…”

Section: Thermocatalysismentioning

confidence: 98%

“…For the thermal decomposition of DMMP, amorphous manganese oxide (AMO) can also be used. AMO for catalysis was prepared as a result of the degradation of KMnO4, which allowed to obtain powder with a specific surface area 200 ± 10 m 2 /g (Segal et al 2001). The use of amorphous manganese oxide in the temperature range of 200-400 °C as a catalyst for the thermal decomposition of DMMP leads to the formation of carbon dioxide and methyl alcohol (Segal et al 2001).…”

Section: Thermocatalysismentioning

confidence: 99%

Thermal and catalytic methods used for destruction of chemical warfare agents

Nawała

Jóźwik

Popiel

2019

Int. J. Environ. Sci. Technol.

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The decontamination of chemical warfare agents (CWAs) from structures, environmental media and even personnel has become an area of particular interest in recent years due to increased homeland security concerns. This article reviews applications of catalytic methods used for decontamination of CWAs. Most attention was given to the following methods: thermocatalysis, photocatalysis and enzyme catalysis among the many methods of catalytic CWA decomposition. Unfortunately, there are not enough data obtained with real CWAs due to the difficulty in handling, so we have described also data available for CWAs simulants. These methods can be useful for decontamination systems that can reduce the damage caused by possible terrorism.

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Thermal Decomposition of Dimethyl Methylphosphonate over Manganese Oxide Catalysts

Cited by 39 publications

References 22 publications

Adsorption of dimethyl methylphosphonate and trimethyl phosphate on calcium oxide: an ab initio study

Adsorption of dimethyl methylphosphonate and trimethyl phosphate on calcium oxide: an ab initio study

Effects of deposition variables on spray-deposited MnO2 thin films prepared from Mn(C2H3O2)2·4H2O

Thermal and catalytic methods used for destruction of chemical warfare agents

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