Highly Stable and Active Palladium Nanoparticles Supported on a Mesoporous UiO66@reduced Graphene Oxide Complex for Practical Catalytic Applications

Abstract

A metal–organic framework‐based composite with reduced graphene oxide was successfully designed, prepared and used for the first time as a support for Pd nanoparticles. The as‐synthesized UiO66@RGO‐Pd composite was characterized by powder X‐ray diffraction (XRD), thermal gravimetric analyses (TGA), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N2 adsorption. The reduction of nitro compounds was used to demonstrate the catalytic efficiency, which showed excellent activity due to the large surface area and well‐defined pore structure. Additionally, the Pd NPs confined in mesoporous cages could be readily recovered after simple filtration and reused for at least six consecutive cycles without loss of activity.

Ru/UiO-66 Catalyst for the Reduction of Nitroarenes and Tandem Reaction of Alcohol Oxidation/Knoevenagel Condensation

“…As shown in Figure , both UiO-66 and UiO-66–Ru show three weight-loss stages. The initial weight-loss stage occurring in the temperature range of 25–100 °C is due to desorption of physisorbed water, whereas the second weight-loss stage observed in the temperature range of 100–500 °C is related to the removal of dimethylformamide (DMF) and the dehydroxylation of the zirconium oxo-clusters. , The third weight-loss stage starting at 500 °C is attributed to the decomposition of UiO-66 as a result of the burning of organic-linker molecules in the framework. The results revealed that UiO-66–Ru is thermally stable below 500 °C.…”

Controllable Synthesis of Pd-ZIF-L-GO: The Role of Drying Temperature

“…GO could effectively improve the hole and chemical properties of the materials and promote CO 2 adsorption. Liu et al 25 reported a novel mesoporous UiO-66@GO-Pd catalyst with highly dispersed Pd nanoparticles. The catalyst displayed excellent catalytic activity and stability in nitro-hydrogenation due to the plentiful pores generated in the UiO-66@GO carrier and the strong interaction between the carrier and Pd nanoparticles.…”

“…With the rapid development of two-dimensional materials, graphene-based composites have been extensively studied and widely used in the fields of energy, adsorption, sensing, supercapacitors, and catalysis. − Current studies mainly focus on graphene–polymer composites and graphene–inorganic nanocomposites represented by metals and metal oxides. The application of the graphene matrix (in particular graphene oxide (GO)) with MOFs also has attracted tremendous interest. ,,− Petit et al first prepared MOF/GO composites in situ and used them for gas adsorption. Cao et al found that the rich oxygen groups of GO might anchor the metal precursor Zr 4+ of UiO-66 and guide the growth of UiO-66 crystals.…”

Pd Nanoparticles Immobilized in Layered ZIFs as Efficient Catalysts for Heterogeneous Catalysis

“…From Table S4, Pd@ZIF-L-Co exhibits higher TOF values than Pd@ZIF-67 in all of the reactions. In addition, the Pd@ZIF catalysts present different catalytic performances during the reductions of different types of nitroarenes with varying positional substitutions due to the different electron transport properties between the catalysts and the reactants . Among these reactions, the reductions of o -nitrophenol and p -nitrobenzoic acid can be completed in a relatively short amount of time.…”