METHANE TO METHANOL PARTIAL OXIDATION USING Cu-FERRIERITE

Date

2024-7-12

Author

Yılmaz, Abdullah Azad

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Methane is an abundant chemical but it is not easy to transport or convert to other chemicals. This is mainly because methane is a stable molecule, its conversion is highly energy intensive and selectivity to desired product is low due to overoxidation. In this study, the partial oxidation of methane to methanol by continuous catalytic method using N2O in copper-containing zeolites (AEI, CHA, FER) is examined. These zeolites, especially FER, were optimized using different copper amounts and it was found that infinitesimal amount of copper (Cu/Al=0.02) gave the highest methanol formation. Among different heating methods, heating of the catalyst bed with helium rather than reactant gases was preferred for higher methanol production and reusability. The activity tests were carried out under 100 sccm total flow with 40% CH4, 15% N2O, 3% H2O and balance He at 310–325 ℃ and the highest methanol production with high stability (1249 μmol g-1h-1) was detected over FER at 325 ℃ among other microporous zeolite samples. Nano-FER was synthesized in order to improve selectivity and to increase the methanol production and it was found to be more active compared to Micro-FER (1594 μmol g-1h-1 at 325 ℃). H2O effect was also studied and the optimum condition of 9% H2O was chosen. The best result in terms of activity was obtained over Nano-Cu-FER_1 with the methanol formation rate of 2174 μmol g-1h-1 and methanol selectivity of 79%. In line with the activation energy calculation and UV–Vis analyses, monocopper was identified as the active site.

Subject Keywords

Methane, Methanol, Copper, FER, H2O

URI

https://hdl.handle.net/11511/110430

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Graduate School of Natural and Applied Sciences, Thesis