On the Synergy Effect in MoO3–Fe2(MoO4)3 Catalysts for Methanol Oxidation to Formaldehyde

Topics in Catalysis - Tập 50 - Trang 145-155 - 2008
Emma Söderhjelm1, Matthew P. House2, Neil Cruise1, Johan Holmberg3, Michael Bowker2, Jan-Olov Bovin4, Arne Andersson5
1Perstorp Specialty Chemicals AB, Process and Catalyst Development, Perstorp, Sweden
2School of Chemistry, Main Building, Cardiff University, Cardiff, UK
3Perstorp Specialty Chemicals AB, Perstorp Formox, Perstorp, Sweden
4Division of Polymer and Materials Chemistry, Department of Chemistry, Lund University, Chemical Center, Lund, Sweden
5Department of Chemical Engineering, Lund University, Chemical Center, Lund, Sweden

Tóm tắt

Methanol oxidation to formaldehyde was studied over a series of Fe–Mo–O catalysts with various Mo/Fe atomic ratio and the end compositions Fe2O3 and MoO3. The activity data show that the specific activity passes through a maximum with increase of the Mo content and is the highest for Fe2(MoO4)3. The selectivity to formaldehyde, on the other hand, increases with the Mo content in the catalyst. A synergy effect is observed in that a catalyst with the Mo/Fe ratio 2.2 is almost as active as Fe2(MoO4)3 and as selective as MoO3. Imaging of a MoO3/Fe2(MoO4)3 catalyst by SEM and TEM shows that the two phases form separate crystals, and HRTEM reveals the presence of an amorphous overlayer on the Fe2(MoO4)3 crystals. EDS line-scan analysis in STEM mode demonstrates that the Mo/Fe ratio in the amorphous layer is ~2.1 in the fresh catalyst and ~1.7 in the aged catalyst. The enrichment of Mo at the catalyst surface is confirmed by XPS data. Raman spectra give evidence for the Mo in the amorphous material being in octahedral coordination, which is in contrast to the crystalline Fe2(MoO4)3 bulk structure where Mo has tetrahedral coordination. X-ray diffraction (XRD) analysis gives no support for the formation of a defective molybdate bulk structure. The results presented give strong support for the Mo rich amorphous structure being observed on the Fe2(MoO4)3 crystal surfaces being the active phase for methanol oxidation to formaldehyde.

Tài liệu tham khảo

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Topics in Catalysis

Tập 50

145-155

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