CO Hydrogenation to Methanol over Cu/MgO Catalysts and Their Synthesis from Amorphous Magnesian Georgeite Precursors
TLDR
In this paper , the synthesis of Mg substituted copper hydroxycarbonates by constant pH co-precipitation with subsequent ageing of the precipitate has been studied in detail.Abstract:
The synthesis of Mg‐substituted copper hydroxycarbonates by constant‐pH co‐precipitation with subsequent ageing of the precipitate has been studied in detail. This allowed the retrieval of crystalline magnesian malachite samples, which showed a “radical‐sign‐shaped” pH drop and the blue/green color change during ageing that is well‐known from the analogous Cu/Zn system. The crystallization of Cu‐rich samples has been studied elaborately by means of powder diffraction, pair distribution function (PDF), and infrared spectroscopy, thus elucidating the ageing chemistry of Cu,Mg hydroxycarbonates in general. It was found that up to 17 % Mg can be incorporated into the crystalline malachite using a synthesis route comparable to that established for Cu/ZnO catalysts, but with drastically elongated precipitate ageing times. For higher Mg contents, a step‐like pH drop was observed instead, and an amorphous variant of the hydroxycarbonate, referred to as “magnesian georgeite”, could be isolated. From such a Mg‐rich sample (Cu/Mg 70 : 30 at. %), a Cu/MgO catalyst has been prepared that shows high activity and good stability in CO hydrogenation to methanol over 800 hrs. time on stream.read more
Citations
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Journal ArticleDOI
Cu‐Co/ZnAl 2 O 4 Catalysts for CO Conversion to Higher Alcohols Synthesized from Co‐Precipitated Hydrotalcite Precursors
Benjamin Mockenhaupt,Fatih Özcan,Remco Dalebout,Sebastian Mangelsen,Thomas Machowski,Petra E. de Jongh,Malte Behrens +6 more
TL;DR: The role of Cu:Co composition in bi-metallic Cu-Co/ZnAl2O4 catalysts on higher alcohol synthesis (HAS) was investigated at H2:CO = 4.5 % as discussed by the authors .
Journal ArticleDOI
Substitution of Copper by Magnesium in Malachite: Insights into the Synthesis and Structural Effects.
Gereon Behrendt,Nils Prinz,A Wolf,Lorena Baumgarten,Abhijeet Gaur,Jan-Dierk Grunwaldt,Mirijam Zobel,Malte Behrens,Sebastian Mangelsen +8 more
TL;DR: In this article , the phase width of the copper hydroxycarbonate malachite, Cu2CO3(OH)2, upon substitution with magnesium has been studied in detail, and a continuous increase of the magnesium fraction was found during aging and the corresponding structural evolution was studied by means of PDF.
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Methanol dehydration catalysts in direct and indirect dimethyl ether (DME) production and the beneficial role of DME in energy supply and environmental pollution
TL;DR: In this paper , the performance and stability of metal organic framework (MOF) and metal 2O3 catalysts for methanol dehydration in direct and indirect processes are discussed. And the effects of particle size, pore structures, promoters, and preparation methods on mentioned catalysts have been reviewed.
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