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

Jiang, Heqing; Bongard, Hans‐Josef; Schmidt, Wolfgang; Schüth, Ferdi

doi:10.1016/j.micromeso.2012.08.004

Cited by 52 publications

(52 citation statements)

References 32 publications

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“…Later, this method was further extended to synthesize mesoporous alumina-supported metal oxides (NiO, Cr 2 O 3 , CeO 2 , etc.) [20][21][22][23], and the high-quality mesoporous structure with strong metalsupport interactions and homogeneous distribution of active component was observed [24,25].…”

Section: Introductionmentioning

confidence: 91%

Effect of reduction–oxidation treatment on structure and catalytic properties of ordered mesoporous Cu–Mg–Al composite oxides

Zhang

Jiao

et al. 2015

Science Bulletin

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Ordered mesoporous Cu-Mg-Al composite oxides were synthesized via the one-pot evaporation-induced self-assembly strategy. Using this method, copper was first homogeneously incorporated into the ordered mesoporous spinel matrix. After H 2 reduction treatment, according to X-ray diffraction (XRD) and transmission electron microscopy (TEM) results, copper existed as metallic nanoparticles with the size of 6-10 nm that well decorated the parent mesoporous skeleton. The metallic nanoparticles were then re-oxidized to copper oxide when exposed to air or during CO oxidation reaction at low temperatures. Thus, copper migrated from bulk spinel phase to the surface after the reduction-oxidation treatment. Moreover, the copper on the surface was re-incorporated into the bulk spinel phase by further thermal treatment at much higher temperature in the presence of air. The correlation between the state of copper in the mesoporous composite oxides and the catalytic performance toward CO oxidation was studied. It was found that copper existed as oxide nanoparticles on the surface of mesoporous Mg-Al skeleton is much more active than that existed as lattice Cu ions in spinel phase.

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Section: Introductionmentioning

confidence: 91%

Effect of reduction–oxidation treatment on structure and catalytic properties of ordered mesoporous Cu–Mg–Al composite oxides

Zhang

Jiao

et al. 2015

Science Bulletin

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“…The samples 0-Cu, 1-Cu, and 5-Cu possess very narrow pore size distributions with a maximum at approximately 4 nm, which is a typical pore diameter observed for materials synthesized with P123 as the structure directing agent. 51 However, as the Cu loading increases to 10%, the pore size distribution becomes broader, and no distinct peak at 4 nm can be observed as a result of the hindered ordering around the P123 micelles. This effect becomes more pronounced at a Cu loading of 20% for which a very broad pore size distribution is observed.…”

Section: Catalyst Characterizationmentioning

confidence: 98%

“…The CuAl 2 O 3 catalysts were synthesized by a modified protocol from the literature. 63 Briefly, 4.5 g of Pluronic P123 and 7.5 mL of a 65% HNO 3 were added to 100 mL of ethanol. After stirring for 4 h, the appropriate quantities of aluminum isopropoxide and copperĲII) nitrate were added under vigorous stirring.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…51 The catalysts are labelled 0-Cu, 1-Cu, 5-Cu, 10 Cu, and 20-Cu according to their nominal copper content in wt%. As shown by the EDX analysis, the actual Cu content is in excellent agreement with the nominal amounts (Table S1 †).…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…50 In this context, ordered mesoporous Cu-γ-Al 2 O 3 is of special interest for catalytic applications due to the fine dispersion of copper in the γ-Al 2 O 3 matrix and its high surface area. 51 High concentrations of glycerol typically lead to highly viscous liquids, and therefore liquid phase catalytic reactions involving glycerol are usually carried out with relatively low concentrations between 0.05 M and 0.3 M in order to avoid mass transport limitations in the solvent. The solvent of choice is typically water.…”

Section: Introductionmentioning

confidence: 99%

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Selective glycerol oxidation over ordered mesoporous copper aluminum oxide catalysts

Schünemann

Tüysüz

2017

Catal. Sci. Technol.

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Glycerol is a major by-product of the biodiesel production and is therefore produced in high quantities. While currently there are limited possible applications for this highly functionalized molecule, glycerol can be a cheap and abundant feedstock for value-added products that are accessible by selective oxidation.Usually, the selective oxidation of glycerol utilizes expensive noble metal catalysts, such as Au, Pt, and Pd. Here we report the selective oxidation of glycerol in basic media, using ordered mesoporous Cu-Al 2 O 3 catalysts with various Cu loadings prepared by a facile soft-templating method. The materials were characterized in detail by nitrogen physisorption, vis-NIR spectroscopy, EDX, low-and wide-angle XRD, XPS, and TEM. Subsequently the reaction conditions for glycerol oxidation were optimized. The catalytic oxidation of glycerol yields C 3 products, such as glyceric acid and tartronic acid, and also C 2 and C 1 products, such as glycolic acid, oxalic acid, and formic acid. Moreover, the role of the solvent on the catalytic reaction was investigated, and the addition of various co-solvents to the aqueous reaction mixture was found to increase the initial reaction rate up to a factor of three. The trends of the initial reaction rates correlate well with the polarity of the water/co-solvent mixtures. The prepared Cu-Al 2 O 3 catalysts are a more costefficient and environmentally viable alternative to the reported noble metal catalysts.

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Multiphase Flow Reactors for Methanol and Dimethyl Ether Production

Wang

2017

Multiphase Reactor Engineering for Clean and Low‐Carbon Energy Applications

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

Cited by 52 publications

References 32 publications

Effect of reduction–oxidation treatment on structure and catalytic properties of ordered mesoporous Cu–Mg–Al composite oxides

Effect of reduction–oxidation treatment on structure and catalytic properties of ordered mesoporous Cu–Mg–Al composite oxides

Selective glycerol oxidation over ordered mesoporous copper aluminum oxide catalysts

Multiphase Flow Reactors for Methanol and Dimethyl Ether Production

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