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One-pot synthesis of mesoporous Cu-γ-Al2O3 as bifunctional catalyst for direct dimethyl ether synthesis

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons58648

Jiang,  Heqing
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons58443

Bongard,  Hans-Josef
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons58966

Schmidt,  W.
Research Group Schmidt, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons58985

Schüth,  Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Zitation

Jiang, H., Bongard, H.-J., Schmidt, W., & Schüth, F. (2012). One-pot synthesis of mesoporous Cu-γ-Al2O3 as bifunctional catalyst for direct dimethyl ether synthesis. Microporous and Mesoporous Materials, (Volume 164), 3-8. doi:10.1016/j.micromeso.2012.08.004.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0010-2491-0
Zusammenfassung
Mesoporous copper–alumina (Cu–Al2O3) with different copper contents was synthesized in a one-pot reaction via the evaporation-induced self-assembly of Pluronic P123 and the corresponding metal precursors in ethanolic solution in the presence of nitric acid. Mesoporous Cu–Al2O3 calcined at 400 °C exhibits a large BET surface area of 265 m2/g and a pore volume of 0.48 cm3/g. XRD results indicate that the wall of mesoporous Cu–Al2O3 calcined at 400 °C is amorphous, and that it is transformed to crystalline material by further thermal treatment at 800 °C. Copper was formed as very small particles in the composite under 5% H2 flow at high temperature. Moreover, the mesoporous structure did not collapse after the sample was reduced at 650 °C for 4 h, and the copper particles with sizes of around 6 nm were well distributed through the entire mesoporous γ-Al2O3 network. Using the mesoporous Cu/γ-Al2O3 as a bifunctional catalyst for one-step dimethyl ether synthesis from synthesis gas, a CO conversion of 72% and a DME selectivity of 69% were obtained at 50 bar and 310 °C.