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  Ternary and quaternary Cr or Ga-containing ex-LDH catalysts—Influence of the additional oxides onto the microstructure and activity of Cu/ZnAl2O4 catalysts

Kühl, S., Schumann, J., Kasatkin, I., Hävecker, M., Schlögl, R., & Behrens, M. (2015). Ternary and quaternary Cr or Ga-containing ex-LDH catalysts—Influence of the additional oxides onto the microstructure and activity of Cu/ZnAl2O4 catalysts. Catalysis Today, 246, 92-100. doi:10.1016/j.cattod.2014.08.029.

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 Creators:
Kühl, Stefanie1, Author           
Schumann, Julia1, Author           
Kasatkin, Igor1, Author           
Hävecker, Michael1, Author           
Schlögl, Robert1, 2, Author           
Behrens, Malte1, 3, Author           
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1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Max-Planck-Institute for Chemical Energy Conversion, Heterogeneous Reactions Department, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany, ou_persistent22              
3University of Duisburg-Essen, Faculty of Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstr. 5-7, 45141 Essen, Germany, ou_persistent22              

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Free keywords: Catalyst synthesis; Supported catalysts; Cu/ZnO/Al2O3 catalysts, Layered double hydroxides
 Abstract: The stepwise substitution of Al by Cr and Ga leads to quaternary LDH precursors for Cu/ZnM2O4 (M = Al, Ga, Cr) catalysts. With the substitution of Al by Cr the interaction of the Cu phase with the oxide matrix is gradually weakened, which is caused by the participation of the chromium oxide phase in the redox processes during catalyst preparation. Such reactive Cr oxide matrix is less efficient than the inert Al oxide matrix in stabilizing the special microstructure of Cu/ZnM2O4 catalysts. These weakened interactions led to a lowering of the Cu particle embedment, coinciding with a pronounced Cu crystallite growth during reduction. Both effects partially compensate each other and a maximum in Cu surface area is observed for intermediate Cr contents. In the Ga-substituted catalysts, two distinct Cu species were found for high Ga contents. This is attributed to the presence of partially crystalline spinel and the resulting different strength of interface interaction of the CuO phase with the crystalline and the amorphous oxide. After reduction Cu catalysts with similar average Cu particle sizes as well as Cu surface areas were obtained. In both sample series, the catalytic activity in methanol synthesis does not scale with the Cu surface area and the experiments show that a strong interaction to the oxide is necessary to gain stability and activity of the Cu phase. Al substitution thus confirms that interface interactions between Cu and the oxide seem to beneficially affect the activity of the Cu particles and the optimal catalyst requires a compromise of exposed surface and interface.

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Language(s): eng - English
 Dates: 2014-09-182015-05-15
 Publication Status: Issued
 Pages: 9
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.cattod.2014.08.029
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Title: Catalysis Today
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 246 Sequence Number: - Start / End Page: 92 - 100 Identifier: ISSN: 0920-5861
CoNE: https://pure.mpg.de/cone/journals/resource/954925564669