Composition Effect on the Formation of Oxide Phases by Thermal Decomposition of CuNiM(III) Layered Double Hydroxides with M(III) = Al, Fe
Journal article, 2024
The thermal decomposition processes of coprecipitated Cu-Ni-Al and Cu-Ni-Fe hydroxides and the formation of the mixed oxide phases were followed by thermogravimetry and derivative thermogravimetry analysis (TG – DTG) and in situ X-ray diffraction (XRD) in a temperature range from 25 to 800 °C. The as-prepared samples exhibited layered double hydroxide (LDH) with a rhombohedral structure for the Ni-richer Al- and Fe-bearing LDHs and a monoclinic structure for the CuAl LDH. Direct precipitation of CuO was also observed for the Cu-richest Fe-bearing samples. After the collapse of the LDHs, dehydration, dehydroxylation, and decarbonation occurred with an overlapping of these events to an extent, depending on the structure and composition, being more pronounced for the Fe-bearing rhombohedral LDHs and the monoclinic LDH. The Fe-bearing amorphous phases showed higher reactivity than the Al-bearing ones toward the crystallization of the mixed oxide phases. This reactivity was improved as the amount of embedded divalent cations increased. Moreover, the influence of copper was effective at a lower content than that of nickel.
layered double hydroxides
spinel aluminate
thermogravimetry
bunsenite
tenorite
in situ X-ray diffraction
spinel ferrite
Author
Iqra Zubair Awan
University of Bologna
Institut Charles Gerhardt Montpellier
Lahore Garrison University
Hoang Phuoc Ho
Chalmers, Chemistry and Chemical Engineering, Chemical Technology
Institut Charles Gerhardt Montpellier
Giada Beltrami
University of Ferrara
B. Fraisse
Institut Charles Gerhardt Montpellier
Thomas Cacciaguerra
Institut Charles Gerhardt Montpellier
Pierrick Gaudin
Institut Charles Gerhardt Montpellier
Nathalie Tanchoux
Institut Charles Gerhardt Montpellier
Stefania Albonetti
University of Bologna
Annalisa Martucci
University of Ferrara
Fabrizio Cavani
University of Bologna
Francesco Di Renzo
Institut Charles Gerhardt Montpellier
Didier Tichit
Institut Charles Gerhardt Montpellier
Materials
19961944 (eISSN)
Vol. 17 1 83Subject Categories
Materials Chemistry
DOI
10.3390/ma17010083
PubMed
38203936