Oxidative dimerization of methane in molten Na2CO3-K2CO3 eutectic at 800°C

Moneuse, C.; Cassir, M.; Martin, G.; Devynck, Jacques

doi:10.1016/0926-860x(92)80148-6

Cited by 10 publications

(6 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the presence of carbonate phases can assist also the formation and stabilization of peroxide species 33–36 . Such peroxides species could activate methane in a selective fashion to generate methyl radicals 32,35,37 . Otsuka et al 38,39 reacted CH 4 with bulk peroxides (Na, Sr, Ba) and observed C 2 coupling products already at 400 °C.…”

Section: Discussionmentioning

confidence: 99%

A meta-analysis of catalytic literature data reveals property-performance correlations for the OCM reaction

et al. 2019

View full text Add to dashboard Cite

Decades of catalysis research have created vast amounts of experimental data. Within these data, new insights into property-performance correlations are hidden. However, the incomplete nature and undefined structure of the data has so far prevented comprehensive knowledge extraction. We propose a meta-analysis method that identifies correlations between a catalyst’s physico-chemical properties and its performance in a particular reaction. The method unites literature data with textbook knowledge and statistical tools. Starting from a researcher’s chemical intuition, a hypothesis is formulated and tested against the data for statistical significance. Iterative hypothesis refinement yields simple, robust and interpretable chemical models. The derived insights can guide new fundamental research and the discovery of improved catalysts. We demonstrate and validate the method for the oxidative coupling of methane (OCM). The final model indicates that only well-performing catalysts provide under reaction conditions two independent functionalities, i.e. a thermodynamically stable carbonate and a thermally stable oxide support.

show abstract

Section: Discussionmentioning

confidence: 99%

A meta-analysis of catalytic literature data reveals property-performance correlations for the OCM reaction

et al. 2019

View full text Add to dashboard Cite

show abstract

“…It was also shown that the variation of the amount of 0 2 _ followed the trend of the methanol selectivity. Furthermore, a comparison of the results with those of other studies [4,5] which suggested that 0 22-plays an important role in the C2 compound formation indicated that 0 2 _ should lead to methanol formation [10] while 0 2 2~ should lead to C2 compound formation [4,5], and nitrate ions were considered to promote the ox idation of O2-and 0 22-to C>2~ according to eqs (4) and (5). In order to further confirm the role of 0 2~ in methanol formation, in the present work we used molten (Na, K)N02 as medium to perform the par tial oxidation of methane to methanol.…”

Section: Introductionmentioning

confidence: 95%

“…In these studies, the authors suggested that reduced oxygen species played an important role in the for mation of C2 compounds [3 -5 ]. Thermodynamic and electrochemical studies in molten barium hy droxide [5,7] and alkali carbonates [4,8,9] have shown that peroxide ion was the stable form of re duced oxygen species in basic media, and may in crease the selectivity of formation of C2 compounds [4,5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Partial Oxidation of Methane to Methanol with Nitrite and Nitrate Melts

Lee

Kitsukawa

Nakagawa

et al. 1998

Zeitschrift Für Naturforschung B

View full text Add to dashboard Cite

The effect of reduced oxygen species on the partial oxidation of methane to methanol was examined with nitrite melts. The experimental results support the suggestion that the formation of methanol or C2 compounds depends on different reduced oxygen species, as observed in our previous work using nitrate melts. It has been suggested that the partial oxidation of methane proceeds to CH3OH or C2 compounds via parallel pathways. This suggestion was verified by increasing the oxygen concentration to carry out the partial oxidation of methane in 25 mol% NaNC>3 -75 mol% KNO3 melts. A methanol selectivity of 8.2% and a methanol yield of 0.43% were observed with CH4/O 2 = 15/1 at 575 °C, whereas with CH4/O 2 = 7/1 methanol selectivity and yield increased to 23.7% and 1.1%, respectively. The results further confirm the contribution of the superoxide ion O 2-on methanol formation.

show abstract

“…Previous work on dimerization of methane in molten carbonate salts suggests that O À ions which are present in the salts are the chemical species that arc most likely to abstract H atoms from methane molecules (33,34) . Assuming that O À ions can also abstract H atoms from HMX and TATB, an estimate can be made of whether these reactions are endothermic or exothermic.…”

Section: Salt Composition Effectsmentioning

confidence: 99%

High Speed Imaging of TATB- and HMX-Based Energetic Material Decomposition in Molten Salts

Pantoya

Shaw²,

Megas

2000

Propellants Explos. Pyrotech

View full text Add to dashboard Cite

Hochgeschwindigkeitsbildanalyse der Zersetzu È ng von auf TATB und HMX basierenden energetischen Materialien in geschmolzenen SalzenUntersucht wird die Einbringung energetischer Materialien in Hochtemperaturba Èder geschmolzener Salze als eine Methode zu ihrer sicheren Vernichtung. In diesen Ba Èdern zersetzt sich das Material. In der vorgestellten Forschungsarbeit wird das Verhalten der Sprengstoffe LX-17 (92,5 Gew.% 1,3,5-Triamino-2,4,6-trinitrobenzol (TATB), 7,5 Gew.% Kel-F Kunststoffbinder) und 3,5,3,5, SummaryImmersion of energetic materials into high-temperature molten-salt baths, where the energetic materials decompose, is being considered as a method for their safe destruction. In the present research, behaviors of the high explosives LX-17 (92.5 wt% 1,3,5-triamino-2,4,6-trinitrobenzene (TATB), 7.5 wt% KeI-F 800 plastic binder) and 3,5,3,5,, 15 wt% Viton A plastic hbinder) were studied when these materials were immersed into molten salt baths. Pressed cylindrical samples initially 6.35 mm in diameter and length were immersed in molten salt baths, and data were taken photographically. Sample decomposition behaviors were observed for varied salt temperatures in a molten LiClNaCl-KC1 eutectic and then separately in a molten Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 eutectic. Bath temperatures ranged from 650 to 750 C. General combustion behaviors such as bubble formation characteristics, gas evolution, and sample lifetimes were observed. Results indicated that sample lifetimes decreased as bath temperatures increased, and that the carbonate eutectic increased initial decomposition rates and decreased sample lifetimes relative to the chloride eutectic.

show abstract

Oxidative dimerization of methane in molten Na2CO3-K2CO3 eutectic at 800°C

Cited by 10 publications

References 16 publications

A meta-analysis of catalytic literature data reveals property-performance correlations for the OCM reaction

A meta-analysis of catalytic literature data reveals property-performance correlations for the OCM reaction

The Partial Oxidation of Methane to Methanol with Nitrite and Nitrate Melts

High Speed Imaging of TATB- and HMX-Based Energetic Material Decomposition in Molten Salts

Contact Info

Product

Resources

About