The CuZnZrAl hydroxycarbonates as copper catalyst precursors—Structure, thermal decomposition and reduction studies Paweł Kowalik, Marcin Konkol, Mał

Authors: Paweł Kowalik, Marcin Konkol, Małgorzata Kondracka, Wiesław Próchniak, Robert Bicki, Paweł Wiercioch

Abstract:
The transformations of a series of complex CuZnZrAl hydroxycarbonates as copper catalyst precursors have been investigated. The materials have been prepared by the coprecipitation method and characterized by means of XRD, ICP-OES, TG-MS, TPR and N₂O chemisorption. The results reveal that the Zr/Al ratio has got an influence on the formation of hydrotalcite-like phases of copper–zinc–aluminum hydroxycarbonates. The increase of ZrO₂ content results in the increase of amorphous phase content in the hydroxycarbonate precursors. Moreover, the increase of ZrO₂ content causes the formation of CuO crystallites at higher temperatures during calcination. At the lower calcination temperatures (up to ca. 400 ^◦C) the incorporation of zirconium oxide results in the decrease of CuO crystallite size in the calcined mixed oxides compared to the Zr-free sample. At higher calcination temperatures a reversed effect was observed. Two different thermal decomposition pathways of the precursors with and without alumina were observed.

Keywords:
Copper catalyst precursor
Methanol synthesis
CuZnZrAl hydroxycarbonates
Mixed metal oxides
XRD studies

Published in: Applied catalysis A: General  (Volume 452, Pages 1-222, 15 February 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

The CuZnZrAl hydroxycarbonates as copper catalyst precursors—Structure, thermal decomposition and reduction studies Paweł Kowalik, Marcin Konkol, Mał

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