Composition Effect on the Formation of Oxide Phases by Thermal Decomposition of CuNiM(III) Layered Double Hydroxides with M(III) = Al, Fe

Iqra Zubair Awan; Phuoc Hoang Ho; Giada Beltrami; Bernard Fraisse; Thomas Cacciaguerra; Pierrick Gaudin; Nathalie Tanchoux; Stefania Albonetti; Annalisa Martucci; Fabrizio Cavani; Francesco Di Renzo; Didier Tichit

doi:10.3390/ma17010083

Composition Effect on the Formation of Oxide Phases by Thermal Decomposition of CuNiM(III) Layered Double Hydroxides with M(III) = Al, Fe

Materials (Basel). 2023 Dec 23;17(1):83. doi: 10.3390/ma17010083.

Authors

Iqra Zubair Awan^{1

2

3}, Phuoc Hoang Ho^{1

4}, Giada Beltrami⁵, Bernard Fraisse¹, Thomas Cacciaguerra¹, Pierrick Gaudin¹, Nathalie Tanchoux¹, Stefania Albonetti^{2

6}, Annalisa Martucci⁵, Fabrizio Cavani^{2

6}, Francesco Di Renzo¹, Didier Tichit¹

Affiliations

¹ ICGM, University Montpellier, CNRS, ENSCM, 1919 Route de Mende, 34090 Montpellier, France.
² Department of Industrial Chemistry "Toso Montanari", Alma Mater Studiorum-Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy.
³ Department Chemistry, Lahore Garrison University, Lahore 54000, Pakistan.
⁴ Chemical Engineering, Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
⁵ Department Physics and Earth Sciences, University of Ferrara, Via Saragat 1, 44100 Ferrara, Italy.
⁶ Center for Chemical Catalysis-C3, Alma Mater Studiorum-Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy.

Abstract

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.

Keywords: bunsenite; in situ X-ray diffraction; layered double hydroxides; spinel aluminate; spinel ferrite; tenorite; thermogravimetry.

Grants and funding

This research received no external funding.