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

Abstract

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.

Die direkte katalytische Oxidation von Methan zu Methanol – eine kritische Beurteilung

“…Bei 323 Kwurde eine TONvon 480 mit einer TOF von 20 h À1 ermittelt. [ [74,75,80,106,107] Methanolderivate:M ethylbisulfat, [65,66,69,70,76,84,87,89,91] Methylbromid, [108] Methyltrifluoracetat; [109,110] und Summe von Methylformiat und Trifluoracetatestern. [100] Weitere Berichte zeigen, dass Methan mit folgenden Katalysatoren aktiviert werden kann:R hodiumbis(chinolinyl)benzolkomplexe, [101] der Tr ikupferkomplex [Cu I Cu I Cu I (7-N-Etppz)] 1+ (7-N-Etppz = 3,3'-(1,4-Diazepan-1,4-diyl)bis[1-(4-ethylpiperazin-1-yl)propan-2-ol), [102] metallfreie [OSiOH] + -Cluster [103] sowie Thallium(III) und Blei(IV)-Kationen.…”

Homogeneous catalytic systems for selective oxidation of methane: state of the art

“…Lee et al 51 and Peng 52 oxidized methane with oxygen in molten salts. The Lee group used sodium and potassium nitrate in 526-600 o C at 0.1 MPa pressure.…”