Palladium nanoparticles supported on mesoporous natural phosphate: An efficient recyclable catalyst for nitroarene reduction

Abstract

We report the preparation of palladium nanoparticles supported on mesoporous natural phosphate (Pd@NP) using a wetness impregnation method. The prepared catalyst was characterized using various techniques. Furthermore, the reduction and preparation of the palladium nanoparticles was followed using UV–visible spectra. Based on the Scherrer equation, the crystallite size of the as‐synthesized palladium nanoparticles was 10.88 nm. The performance of the synthesized catalyst was investigated in the reduction of 4‐nitrophenol as a model substrate to 4‐aminophenol using NaBH4 as a hydrogen source. Moreover, catalytic reduction of various nitroarenes was studied and monitored using UV–visible spectroscopy and gas chromatography. The Pd@NP catalyst showed a high activity for the selected reaction and could be recycled.

Novel palladium nanoparticles supported on mesoporous natural phosphate: Catalytic ability for the preparation of aromatic hydrocarbons from natural terpenes

“…Previously, we confirmed the predominance of Pd (0) compared with Pd (II) by a comparison of Pd@NP 10% (before and after calcination) and PdCl 2 voltammograms. [7] The study of the surface oxide zones of all prepared catalysts (Pd@NP 1%, 5% and 10%) confirms the results of Pd (0) predominance ( Figure 5). On the other hand, the hydrogen zones (Figure 5b) demonstrate the efficiency of the prepared catalyst and the importance of palladium over the mesoporous NP for hydrogen transfer at the catalysts interface (NP was inert in the CV study compared with the other samples).…”

“…[ 7–10 ] To the best of our knowledge, NP has been used for the first time as a support for metal nanoparticles. [ 7 ] Due to the important feature of mesoporous materials that allows a high distribution of active centers, mesoporous NP provides a high distribution and dispersion of palladium nanoparticles. [ 7 ] Relying on NP is the first mining industry in the Moroccan kingdom, as a natural and low‐cost material that exhibits interesting properties, such as ionic substitution ability, structural stability and high adsorption capacity, making it an attractive and cost‐effective catalyst or catalytic carrier for several chemical transformations.…”

Selective Allylic Oxidation of Terpenic Olefins Using Co-Ag Supported on SiO2 as a Novel, Efficient, and Recyclable Catalyst

“…For cobalt and silver, the 1.0 3450 cm -1 1884 cm -1 1650 cm -1 1382 cm -1 1087 cm -1 960 cm -1 806 cm -1 460 cm -1 Wavenumber (cm -1 ) Transmittance (%) studied area shows a good dispersion and distribution in a nanoscale range. In order to study the metal predominant oxidation state of supported catalyst, cyclic voltammetry (CV) experiments represent a good alternative [29]. CV was performed for both the 1 mol% Co-1 mol% Ag supported SiO 2 prepared nanocatalyst and the monometallic supported silica Co/SiO 2 and Ag/SiO 2 ( Figure 8).…”

“…As part of our ongoing research on the development of new heterogeneous nanocatalytic systems [29] as well as the allylic functionalization of natural terpenes [28,30], herein we report the preparation of 1 mol% Co-1 mol% Ag supported on SiO 2 by the sol-gel method as a novel catalyst in the oxidation reaction. e physiochemical properties of the prepared catalyst were examined by XRD, FT-IR, TG-DTG, BET, and SEM/EDX analysis.…”

Palladium Nanoparticles Anchored on Magnesium Organosilicate: An Effective and Selective Catalyst for the Heck Reaction

“…22 On the basis of the half-width of the (111) reflection, the average crystallite size (1.3 nm) of the synthesized palladium nanoparticles was estimated through the Scherrer equation. 23 The morphology of the LACOB-Pd1 catalyst was investigated by SEM analysis ( Figure 2B) and showed that most of the prepared nanoparticles were formed uniformly. B. F. dos Santos et al…”