Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 50: Issue 5-6
Thermal decomposition of Cu-based hydroxycarbonate catalytic precursors for the low-temperature co-shift reaction
Authors:
M. GinésInstituto de Investigaciones en Catálisis y Petroquimica (INCAPE), UNL-Conicet, Santiago del Estero 2654, 3000 Santa Fe, Argentina

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C. ApesteguíaInstituto de Investigaciones en Catálisis y Petroquimica (INCAPE), UNL-Conicet, Santiago del Estero 2654, 3000 Santa Fe, Argentina

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Pages:
745–756
Online Publication Date:
02 Aug 2005
Publication Date:
01 Dec 1997
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf01979204
Keywords:
CO-shift reaction; Cu-based hydrocarbonates; thermal decomposition
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Abstract  

The thermal decomposition of Cu-Zn-Al hydroxycarbonate precursors to obtain water-gas shift catalysts was studied by employing a variety of experimental techniques. A set of six samples containing 34 wt% of Cu and different Al/Zn ratios were prepared by coprecipitation. Depending on the cation ratio, the ternary precursors contained hydrotalcite, aurichalcite and/or rosasite phases. Malachite and hydrozincite were determined in binary Cu/Al and Cu/Zn samples, respectively. The precipitates decomposed in three endothermic transformations in the temperature ranges 363–453 K, 453–673 K and 673–923 K. In the first step (ΔW=0–9%), the hydrotalcite-containing samples lost the crystallization water of the hydrotalcite phase. In the middle-temperature transition (ΔW=18–30%), the samples were completely dehydroxylated and simultaneously eliminated a proportion of the carbonate ions through a two-step dehydroxylation/decarbonation process. The high-temperature transformation (ΔW=3–7%) corresponded to the final decarbonation of the samples. Mixed oxides with a high dispersion of copper were obtained from hydrotalcite-containing precursors: the higher the amount of hydrotalcite in the precursor, the lower the CuO crystallite size in the resulting mixed oxide.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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