Synthesis and characterization of versatile MgO–ZrO2 mixed metal oxide nanoparticles and their applications

Abstract

Nano‐MgO/ZrO2 is prepared and used as catalyst for cross‐aldol condensation, Cbz‐protection of amines, reduction of aromatic nitro compounds and the synthesis of 1,5‐benzodiazepines.

A fluorescence active catalyst support comprising carbon quantum dots and magnesium oxide doping for stabilization of palladium nanoparticles: Application as a recoverable catalyst for Suzuki reaction in water

“…Furthermore, XPS study for Mg1s region showed a single peak in position of 1304 eV which fits well with MgO structure (Fig. 5) [42]. In order to study elemental distribution of the Pd@MgO-CQD, elemental mapping was studied and results confirmed presences of C, Pd, and Mg in the structure (Fig.…”

On the Impact of the Preparation Method on the Surface Basicity of Mg–Zr Mixed Oxide Catalysts for Tributyrin Transesterification

“…Zirconium oxide (ZrO 2 ) is one such prominent metal oxide with amphoteric character [2][3][4], but which in pure form is catalytically inactive for transesterification under mild conditions [5] due to its weak basicity. Efforts to improve the base strength of ZrO 2 have focused on its modification by alkaline earth metals such as calcium [6][7][8] and magnesium [5,[9][10][11][12][13][14]. Such doped zirconias often exhibit a higher surface area, base strength, and stability relative to the parent individual metal oxide components, with Mg-Zr mixed oxides being promising candidates for reactions including Knoevenagel condensation [9,13], furfural-acetone aldol condensation [12], transesterification [5,15], and reduction of carbonyl compounds [16].…”

“…Efforts to improve the base strength of ZrO 2 have focused on its modification by alkaline earth metals such as calcium [6][7][8] and magnesium [5,[9][10][11][12][13][14]. Such doped zirconias often exhibit a higher surface area, base strength, and stability relative to the parent individual metal oxide components, with Mg-Zr mixed oxides being promising candidates for reactions including Knoevenagel condensation [9,13], furfural-acetone aldol condensation [12], transesterification [5,15], and reduction of carbonyl compounds [16]. In the case of aldol condensation, Sádaba et al [12] defined two distinct active sites for MgO-rich Mg-Zr mixed oxides: Mg-O-Mg and Mg-O-Zr sites, with the latter being more reactive.…”

“…However, there are few reports on the application of Mg-Zr mixed oxides to triacyl glyceride transesterification, and the nature of active catalytic species in such systems is poorly established. Mg-Zr mixed oxides are most commonly prepared by co-precipitation [5,[9][10][11][12][13], although alkoxide sol-gel [5,14] and wet impregnation methods [29] are also employed. The resulting mixed oxides usually exhibit large and inhomogeneous particle sizes, characterized by the presence of pure MgO and tetragonal ZrO2 phases [5].…”

Facile Synthesis of Small MgO Nanoparticle/Metal–Organic Framework Hybrid Material

“…The broad absorption peak centered at 1425 cm ¹1 is believed to originate from the vibration of MgO NPs. 20 From the results mentioned above, it is concluded that the heat treatment at 420°C under a hydrogen atmosphere produced the hybrid material composed of MgO NPs and Mg-MOF-74, and the heat treatment at 530°C under a hydrogen atmosphere produced MgO NPs as the main component. In addition, the mean diameter of the MgO NPs was changed by the heating conditions.…”