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Direct Catalytic Conversion of Biogas to Formaldehyde over Molybdenum Based Catalysts
KTH, School of Chemical Science and Engineering (CHE).
2013 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The importance of integrating sustainability into modern way of living is evident. In this diploma work the possibility of developing a method for green formaldehyde production by direct catalytic conversion of biogas was investigated. This process would not require the energy demanding syngas step in the methane to methanol process, but instead convert the methane to methanol in one step. Perstorp Formox produces iron molybdate catalysts that are successful in the methanol to formaldehyde process. In this study, three catalysts supplied by Perstorp Formox were investigated in turns of their potential for the direct catalytic conversion of methane to formaldehyde. Two of the catalysts where a blend of MoO3 and Fe2(MoO4)3, while the third was pure Fe2(MoO4)3. After having completed the process installation the system was run with the three catalysts under different temperatures and flows. The MoO3 + Fe2(MoO4)3 catalysts showed no significant conversion but the pure Fe2(MoO4)3 was a bit more promising. Change in characteristics and properties of the catalysts were investigated with focus on the effect of high temperature levels. This was done by calcining the catalysts at 700 ÂșC, observing their changes optically and performing XRD, BET surface, pore volume and pore size measurements. These measurements and observations led to the conclusion that the catalysts were not suitable for the direct catalytic conversion of methane due to their change in chemical and physical properties that occurred during the process.

Place, publisher, year, edition, pages
Keyword [en]
Direct catalytic conversion, methane, formaldehyde, Fe2(MoO4)3, MoO3, iron molybdate
National Category
Other Chemical Engineering
URN: urn:nbn:se:kth:diva-145855OAI: diva2:720723
Available from: 2014-06-02 Created: 2014-06-02 Last updated: 2014-06-02Bibliographically approved

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