Thermal behavior of Mg−Ni‐phyllosilicate nanoscrolls and performance of the resulting composites in hexene‐1 and acetone hydrogenation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ChemNanoMat Année : 2021

Thermal behavior of Mg−Ni‐phyllosilicate nanoscrolls and performance of the resulting composites in hexene‐1 and acetone hydrogenation

Résumé

Here we report on the thermal properties of Mg−Ni-phyllosilicate nanoscrolls as a promising precursor for production of Ni/silicate composite catalysts. Spontaneous scrolling of the phyllosilicate layer originating from size difference between metal-oxygen and silica sheets provides high surface area of the catalyst. Metal nanoparticles can be obtained directly from the matrix by H2 reduction. The phyllosilicate structure passed through a number of transformations including partial dehydroxylation with formation of sepiolite-like phase followed by silicate or oxide crystallization. Temperature ranges of these transitions overlapped with the reduction process sophisticating the H2 consumption profiles. In particular, some amount of Ni2+ got sealed up by the sepiolite structural features, that opened a path for the tuning of Ni0 : Ni2+ ratio of the catalyst. An increase of Ni content in the system yielded a decrease in the metal nanoparticles sizes due to both high intensity of nucleation and type of residual matrix. Ni nanoparticles size distribution and specific surface area of the composite catalysts governed conversion rate of hexene-1 and acetone hydrogenation. In the view of the turnover frequency MgNi2Si2O5(OH)4 precursors were slightly more preferable than pure Ni3Si2O5(OH)4.
Fichier principal
Vignette du fichier
FINAL thermal properties Mg-Ni.pdf (12.14 Mo) Télécharger le fichier
FINAL SI file.pdf (541.71 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03349882 , version 1 (14-10-2021)

Identifiants

Citer

Ekaterina K Khrapova, Valery L Ugolkov, Elena A Straumal, Sergey A Lermontov, Vasily Lebedev, et al.. Thermal behavior of Mg−Ni‐phyllosilicate nanoscrolls and performance of the resulting composites in hexene‐1 and acetone hydrogenation. ChemNanoMat, 2021, 7 (3), pp.257-269. ⟨10.1002/cnma.202000573⟩. ⟨hal-03349882⟩
58 Consultations
36 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More