Palladium Nanoparticles Anchored on Amine-Functionalized Silica Nanotubes as a Highly Effective Catalyst

Abstract

The catalytic performance of supported heterogeneous catalysts is mainly dependent on their constitutive components including active species and supports. Therefore, the design and development of effective catalysts with synergistic enhanced effect between active sites and supports is of great significance. A facile in situ reduction approach to prepare amine-functionalized silica nanotubes (ASNTs)-supported Pd (ASNTs@Pd) composite catalyst is demonstrated in this article. Benefiting from the intrinsic physical and chemical properties of the ASNTs support and deposited Pd nanoparticles (NPs), the as-prepared ASNTs@Pd catalyst exhibits superior catalytic activity, stability, and reusability toward nitroarene reduction reactions. For catalytic reduction of 4-nitrophenol, the turnover frequency (TOF) is as high as 313.5 min–1, which is much higher than that of commercial Pd/C (5.0 wt %) and many noble-metal based catalysts reported in the last 5 years. In addition, a high TOF of 57.4 min–1 was also realized by ASNTs@Pd catalyst for the Suzuki coupling reaction.

Comparison of the Level and Mechanisms of Toxicity of Carbon Nanotubes, Carbon Nanofibers, and Silicon Nanotubes in Bioassay with Four Marine Microalgae

“…Silica NPs are mostly valued by their mesoporous properties [19]. Silica nanotubes, in particular, are widely used in drug delivery [20,21], catalysis [22][23][24], and biosensing [25]. The consumer products, large-scale manufacturers producing NMs, synthesizing, and research laboratories could be highlighted among the main sources leading to the release of NPs in the environment [26,27].…”

Functionalized Silicas for Metal‐Free and Metal‐Based Catalytic Applications: A Review in Perspective of Green Chemistry

“…The resultant heterogenous catalyst accomplishes the facile mass transport of reactants, and easy access of reactants to active sites during p ‐nitrophenol reduction. The TOF of catalyst is well comparable to that of the earlier conventional catalysts reported in the literature . Likewise, there are other evidences demonstrating the significance of morphology of FS in reaching the high dispersion of metal NPs and the enhanced catalytic activity in the nitroarene reduction .…”

“…For the reduction reactions, FS‐based noble metal catalysts are preferential however the non‐noble metal catalysts immobilized on FS are also recently utilized . To investigate the catalytic efficacy of metal NPs in reduction reactions, p ‐nitrophenol reduction to p ‐aminophenol has been employed as the model reaction .…”

Immobilization of Au nanoparticles on poly(glycidyl methacrylate)‐functionalized magnetic nanoparticles for enhanced catalytic application in the reduction of nitroarenes and Suzuki reaction

“…Different kinds of metal catalysts such as Pd, Pt, Fe, Cu, Au, and Rh have been immobilized on solid supports and used for the reduction of nitro compounds with various hydrogen sources. [13][14][15] Suzuki-Miyaura is an important and powerful approach to the construction of unsymmetrical biaryl compounds. [16][17][18][19] Biaryl compounds are an important class of materials that have applications in pharmaceuticals, advanced material chemistry, and agrochemicals.…”