Abstract: The obtained results and recently published data suggest that the active state of Cu-Zn-containing methanol synthesis catalysts is an extremely complicated system, which includes defective metallic particles that strongly interact with the supporting defective ZnO phase in the form of epitaxial bonding and are at least partially decorated by amorphous oxide overlayer [1, 2]. Both the metallic nanoparticles and the oxide support have mixed (Cu-Zn) composition and are defective. Al3+(Cr3+) cations are not merely structural promoter, however, directly affect the specific activity of the active sites. The intimate interaction of Cu-Zn species may only be possible as the result of their genesis from mixed Cu-Zn oxide phases. Solubility Cu2+ in ZnO can be dramatically increased by anionic modification of the mixed oxide structure. Promotion of the oxide structures by small quantities of Al3+(Cr3+) cations can further expand solubility ranges and thermal stability of the catalyst. Evolution of anionic admixtures due to overheating the mixed oxide beyond the threshold of their thermal stability (ca. 380-4000C) leads to decomposition and recrystallization of mixed oxides, causing the decrement of the catalytic activity in methanol synthesis. The most natural way for production of anion-modified mixed oxide is decomposition of mixed hydroxycarbonates at moderate temperatures.

Cite: Minyukova T.P. , Khassin A.A. , Yurieva T.M.
Peculiarities of Controlled Synthesis of Highly Efficient Cu-Containing Catalyst for Methanol Synthesis
In compilation EuropaCat XII. Catalysis: Balancing the use of fossil and renewable resources. XII European Congress on Catalysis, Kazan (Russia), 30 August - 4 September, 2015 : Book of Abstracts. – BIC SB RAS., 2015. – C.501-502. – ISBN 978-5-906376-10-7.

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