Synthesis of NiMoO4 ceramics by proteic sol-gel method and investigation of their catalytic properties in hydrogen production
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Materials Chemistry and Physics
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A proteic sol-gel route was used in the production of NiMoO4 catalysts, which used edible gelatin as a precursor. The triple helix structure of a protein in contact with identical structures acquires an unfolded form, which favors the interaction of the reactive groups of the gelatin (NH3+ and COO−) with the metallic ions (MoO42− and Ni2+). The synthesized catalysts were thoroughly characterized using techniques such as X-ray diffraction, thermogravimetric and differential thermal analysis, Raman scattering, scanning and transmission electron microscopies, UV–Vis spectroscopy, and colorimetry. The results showed that it is possible to prepare the phase-pure α-NiMoO4 polymorph only at temperatures above 700 °C, while a mixture of the polymorphs α and β were obtained at lower temperatures. The synthesized materials calcined at 300, 500, and 700 °C have their catalytic potentials tested in the ethanol steam reforming reaction aiming the production of hydrogen and presented a good performance. The results indicated that among tested materials, the sample calcined at 700 °C exhibited the highest stability, activity, and best selectivity relative to the product of interest.
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SILVA, MAIRA V. da; FAJARDO, HUMBERTO V.; RODRIGUES, THENNER S.; SILVA, FELIPE A. e; BERGAMASCHI, VANDERLEI S.; DIAS, ANDERSON; SIQUEIRA, KISLA P.F. Synthesis of NiMoO4 ceramics by proteic sol-gel method and investigation of their catalytic properties in hydrogen production. Materials Chemistry and Physics, v. 262, p. 1-10, 2021. DOI: 10.1016/j.matchemphys.2021.124301. Disponível em: http://repositorio.ipen.br/handle/123456789/32042. Acesso em: 26 Mar 2026.
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