Sodium Borohydride In Aqueous Solution Research Articles

Electrocatalysis of titanium suboxide-supported Pt–Tb towards formic acid electrooxidation

The Pt–Tb catalysts supported titanium suboxide (Ti4O7) with different amounts of Tb were synthesized by a simple simultaneous reduction reaction with sodium borohydride in aqueous solution. The structure and morphology of the catalysts were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM), and element valence states were investigated by X-ray photoelectron spectroscopy (XPS). Electrochemical characterization techniques, including cyclic voltammetry (CV), chronoamperometry (CA) and CO stripping were used to analyse the electrochemical performance of these catalysts for formic acid oxidation. The results revealed that the Pt-2.5%Tb/Ti4O7 catalyst has a significantly higher activity than the Pt/Ti4O7 catalyst. According to CO stripping results, the promotive effect of Tb can be explained by a bifunctional mechanism. Additionally, the analysis for XPS spectra indicates that the higher content of metallic Pt caused by the addition of Tb also contributes to the better catalytic activity of Pt-2.5%Tb/Ti4O7.

Multifunctional magnetic core–shell dendritic mesoporous silica nanospheres decorated with tiny Ag nanoparticles as a highly active heterogeneous catalyst

In present work, a multifunctional magnetic core–shell dendritic silica nanocatalyst Fe3O4@SiO2@Dendritic-SiO2-NH2-Ag with easy accessibility of active sites and convenient recovery was successfully fabricated by an oil–water biphase stratification coating strategy, and characterized by transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, N2 adsorption–desorption, Fourier transform infrared spectroscopy, and vibrating sample magnetometry. The as-synthesized nanocatalyst Fe3O4@SiO2@Dendritic-SiO2-NH2-Ag displayed excellent catalytic activity for the catalytic reduction of 4-nitrophenol and 2-nitroaniline using sodium borohydride in aqueous solution at room temperature due to easy accessibility of active sites. Interestingly, the novel catalyst could be conveniently recovered by magnetic separation from the reaction system and recycled for at least five times without significant loss in activity. These results indicate that the above mentioned approach based on magnetic core–shell dendritic silica Fe3O4@SiO2@Dendritic-SiO2 provided a useful platform for the preparation of noble metal nanocatalysts with easy accessibility, excellent catalytic activity and convenient recovery.

Multifunctional dendritic mesoporous silica nanospheres loaded with silver nanoparticles as a highly active and recyclable heterogeneous catalyst

In this work, a multifunctional dendritic silica nanocatalyst Dendritic-mSiO(2)-NH2-Ag with easy accessibility of active sites and high surface area was successfully developed by an oil-water biphase stratification coating strategy, and characterized by transmission electron microscopy, scanning electron microscopy, high-resolution transmission electron microscopy, X-Ray photoelectron spectroscopy, X-ray diffraction, N-2 adsorption-desorption, and Fourier transform infrared spectroscopy. The as-synthesized nanocatalyst Dendritic-mSiO(2)-NH2-Ag showed excellent catalytic activity for the catalytic reduction of 4-nitrophenol and 2-nitroaniline using sodium borohydride in aqueous solution at room temperature owing to easy accessibility of active sites. Additionally, the novel catalyst could be conveniently recovered from the reaction system and recycled for at least five times without obvious loss in activity. These results indicate that the aforementioned approach based on dendritic silica Dendritic-mSiO(2) provided a promising platform for the fabrication of noble metal nanocatalysts with easy accessibility and excellent catalytic activity, which could be highly efficient in various catalytic reduction reactions. (C) 2015 Elsevier B.V. All rights reserved.

A novel Ag catalyzation process using swelling impregnation method for electroless Ni deposition on Kevlar® fiber

A novel Ag catalyzation process using swelling impregnation pretreatment method was developed for electroless nickel (EN) deposition on Kevlar fiber. Firstly, the fiber was immersed into an aqueous dimethylsulfoxide (DMSO) solution of silver nitrate to impart silver nitrate into the inner part of the fiber near the surface. Subsequently silver nitrate was reduced to metal silver nanoparticles on the fiber surface by treatment with aqueous solution of sodium borohydride. After electroless plating, a dense and homogeneous nickel coating was obtained on the fiber surface. The silver nanoparticles formed at the fiber surface functioned as a catalyst for electroless deposition as well as an anchor for the plated layer. The study also revealed that the incorporation of surfactant sodium dodecyl sulfate (SDS) in electroless nickel plating bath can enhance the adhesion strength of EN layer with the fiber surface and minimize the surface roughness of the EN coating. The Ni plated Kevlar fiber possessed excellent corrosion resistance and high tensile strength.

Green synthesis, characterization and catalytic efficiency of hypercross-linked porous polymeric ionic liquid networks towards 4-nitrophenol reduction

In this work, we synthesized hypercross-linked porous polystyrene (PS)/ionic liquid (IL) networks by Friedel Crafts alkylation reaction. The obtained porous polymer networks were confirmed by scanning electron microscopy, high resolution-transmission electron microscopy, Fourier-transform infrared spectra and energy-dispersive X-ray spectroscopy. The hypercross-linked porous PS/IL networks showed high surface area (541.13m2/g) and hierarchical porosity compared with non-porous PS membranes (2.52m2/g). The as-prepared hypercross-linked porous PS/IL networks were tested as a catalyst for the reduction of 4-nitrophenol (NP) in aqueous sodium borohydride (NaBH4) solution at ambient temperature. A number of parameters such as catalyst concentration, NaBH4 concentration, and recyclability was investigated for their effect on catalytic performance on the reduction of 4-NP.

Reaction of Henry adducts with aqueous sodium borohydride

AbstractA sequential retro-Henry reduction reaction of 2-nitroalcohols to corresponding alcohols in aqueous sodium borohydride solution is described. The method has large substrate scope and furnished corresponding alcohols in 76–99% yield in 5–30 min at room temperature. The utility of reaction in chemoselective reduction of α,β-unsaturated aldehydes and ring opening of cyclic tert-β-nitroalcohols to open-chain sec-nitroalcohols are also demonstrated. Experimental studies on the mechanism of reaction showed that sodium borohydride may be reducing the aldehyde formed during the reaction, via retro-Henry reaction of 2-nitroalcohols catalysed by in situ-generated “base”, to alcohol.

Hydrogen Generation Via Sodium Borohydride Hydrolysis Using the Graphene Supported Platinum-Ruthenium-Cobalt Catalysts Prepared By Microwave-Assisted Synthesis

Sodium borohydride is of interest as a source for a hydrogen generation during its catalytic hydrolysis. Various catalysts have been developed for this purpose. In the present study the graphene supported platinum-ruthenium-cobalt catalysts (denoted as PtRuCo/GR) with the different Pt:Ru:Co molar ratios, prepared by means of microwave-assisted synthesis, were used as catalysts towards hydrogen generation via sodium borohydride hydrolysis. The morphology and composition of catalysts were examined using Field Emission Scanning Electron Microscopy and Inductively Coupled Plasma Optical Emission Spectroscopy. Catalytic activity of PtRuCo/GR with the different Pt:Ru:Co molar ratios was determined by measuring the amount of hydrogen generated directly from aqueous alkaline solutions of sodium borohydride and compared with that of Co/GR. The data on hydrogen generation volume with respect to time at different concentrations of sodium borohydride and different temperatures have been presented. It has been determined that the PtRuCo/GR catalysts were synthesized with the Pt:Ru:Co molar ratios equal to 1:2:2, 1:1.7:5.6 and 3.5:1:23. The EDX spectra confirm the presence of Pt, Co and Ru nanoparticles in the investigated PtCoRu/GR catalysts. It was found that the temperature and composition of catalysts have exceptional influence on the rate of hydrogen generation from alkaline sodium borohydride solutions. Significantly greater hydrogen generation rate is obtained at the synthesized PtRuCo/GR catalysts as compared with that at Co/GR. Highest rates of hydrogen generation were obtained at 60 oC and are 207.5, 82.8 and 53.1 L min-1 gMtotal -1 for the PtRuCo/GR catalysts with the Pt:Ru:Co molar ratios equal to 1:2:2, 1:1.7:5.6 and 3.5:1:23, respectively. The activation energy (E a), determined from the kinetic data, is 45.6, 55.9 and 50.2 kJ mol-1 for PtRuCo/GR with the above mentioned Pt:Ru:Co molar ratios, indicating a high catalytic activity of the synthesized catalysts towards hydrolysis of sodium borohydride.

Novel nanohybrid polysulfone membrane embedded with silver nanoparticles on graphene oxide nanoplates

Combining silver nanoparticles with graphene oxide (GO) nanoplates may provide a more uniform distribution of silver in membranes. GO nanoplates were synthesised using natural graphite powder according to Hummers method. Silver-decorated GO was prepared by reducing silver nitrate in the presence of aqueous sodium borohydride solution. X-ray diffraction (XRD), transmission electron microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy were used to investigate the silver-decorated GO. The membranes were fabricated by the wet-phase inversion method and were mixed with different amounts (0.00–1.00wt%) of silver-decorated GO. Membrane properties such as hydrophilicity, pure water flux, and rejection were enhanced for all of the nanohybrid membranes. The optimum amounts of silver-decorated GO for optimum membrane properties was 0.5wt%, which resulted in a lower contact angle as well as higher flux and porosity. The nanohybrid membranes also showed excellent antibacterial properties, which could delay or prevent the formation of biofouling on the membrane surface and provide an opportunity for new applications in the future.

Multi-layered macroporous three-dimensional nanofibrous scaffold via a novel gas foaming technique

In the past decade, considerable efforts have been made to fabricate the biomimetic scaffolds from electrospun nanofibers for tissue engineering applications. However, one of the major concerns with electrospun nanofibrous scaffolds is the densely packed fibers in two-dimensional (2-D) array which impedes their applicability in tissue regeneration. To overcome this problem, a simple and facile post-electrospinning procedure was developed to modify a densely packed 2-D electrospun membrane into low density three-dimensional (3-D) scaffolds. In this strategy, an electrospun nanofibrous mat was immersed in a sodium borohydride (SB) solution. The interconnected pores of a mat are filled with the SB solution driven by capillary forces where it undergoes hydrolysis to produce hydrogen gas. The in situ generated gas molecules form clusters to minimize the free energy resulting in pore nucleation that reorganizes the nanofibers to form a low density, macroporous, spongy and multi-layered 3-D scaffold. Electrospun mats of various polar and non-polar polymers were subjected to post-electrospinning process to monitor the fabrication process. It has been found that the solvent for sodium borohydride (either water or methanol) played a crucial role in post-electrospinning process. Only the electrospun mat of polar polymers were amended into 3-D architecture using aqueous SB solution while methanol solution was found equally effective for both polar and non-polar polymers. Moreover, the fabrication process was fast in methanol solution compared to an aqueous solution due to the rapid liberation of hydrogen gas from the methanolysis reaction compared to the hydrolysis reaction. This process will reveal a new approach for the fabrication of a three-dimensional, low-density, nanofibrous materials for biomedical and industrial applications using a wide variety of polymers.

Capping agent-free gold nanostars show greatly increased versatility and sensitivity for biosensing.

We report the first assessment of the plasmonic biosensing capabilities of capping agent-free gold nanostars. Capping agent removal was carried out using aqueous solutions of sodium borohydride, which yielded a refractive index sensitivity of 474 nm/RIU for the polyvinylpyrrolidone (PVP)-free nanostars compared with 98 nm/RIU for PVP-coated gold nanostars. Following PVP removal, biotinylated thiol and streptavidin protein were added to the nanostars, which resulted in red shifts as large as 51 nm and a limit of detection as low as 0.1 pM. Refractive index-based sensing of prostate specific antigen (PSA) both in buffer and serum was then carried out and was shown to yield shifts as large as 127 nm and have a limit of detection of 100 pM in serum. Last, a sandwich assay involving PSA was developed to aggregate the nanostars together for greater sensitivity. The sandwich assay did, indeed, give shifts close to 200 nm and was capable of detecting 10(-17) M PSA in serum. The greatly increased sensitivity and amenability to functionalization of PVP-free gold nanostars should prove useful in applications ranging from catalysis to drug delivery.

Heterogeneous and homogenous catalysts for hydrogen generation by hydrolysis of aqueous sodium borohydride (NaBH4) solutions

AbstractIt is clear that in order to satisfy global energy demands whilst maintaining sustainable levels of atmospheric greenhouse gases, alternative energy sources are required. Due to its high chemical energy density and the benign by‐product of its combustion reactions, hydrogen is one of the most promising of these. However, methods of hydrogen storage such as gas compression or liquefaction are not suitable for portable or automotive applications due to their low hydrogen storage densities. Accordingly, much research activity has been focused on finding higher density hydrogen storage methods. One such method is to generate hydrogen via the hydrolysis of aqueous sodium borohydride (NaBH4) solutions, and this has been heavily studied since the turn of the century due to its high theoretical hydrogen storage capacity (10.8 wt%) and relatively safe operation in comparison to other chemical hydrides. This makes it very attractive for use as a hydrogen generator, in particular for portable applications. Major factors affecting the hydrolysis reaction of aqueous NaBH4 include the performance of the catalyst, reaction temperature, NaBH4 concentration, stabilizer concentration, and the volume of the reaction solution. Catalysts based on noble metals, in particular ruthenium (Ru) and platinum (Pt), have been shown to be particularly efficient at rapid generation of hydrogen from aqueous NaBH4 solutions. However, given the scarcity and expense of such metals, a transition metal‐based catalyst would be a desirable alternative, and thus much work has been conducted using cobalt (Co) and nickel (Ni)‐based materials to attempt to source a practical option. “Metal free” NaBH4 hydrolysis can also be achieved by the addition of aqueous acids such as hydrochloric acid (HCl) to solid NaBH4. This review summarizes the various catalysts which have been reported in the literature for the hydrolysis of NaBH4.

Dynamics of dihydrogen bonding in aqueous solutions of sodium borohydride.

Dihydrogen bonding occurs between protonic and hydridic hydrogens which are bound to the corresponding electron withdrawing or donating groups. This type of interaction can lead to novel reactivity and dynamic behavior. This paper examines the dynamics experienced by both borohydride and its dihydrogen-bound water solvent using 2D-IR vibrational echo and IR pump-probe spectroscopies, as well as FT-IR linear absorption experiments. Experiments are conducted on the triply degenerate B-H stretching mode and the O-D stretch of dilute HOD in the water solvent. While the B-H stretch absorption is well separated from the broad absorption band of the OD of HOD in the bulk of the water solution, the absorption of the ODs hydrogen bonded to BHs overlaps substantially with the absorption of ODs in the bulk H₂O solution. A subtraction technique is used to separate out the anion-associated OD dynamics from that of the bulk solution. It is found that both the water and borohydride undergo similar spectral diffusion dynamics, and these are very similar to those of HOD in bulk water. Because the B-H stretch is triply degenerate, the IR pump-probe anisotropy decays very rapidly, but the decay is not caused by the physical reorientation of the BH₄⁻ anions. Spectral diffusion occurs on a time scale longer than the anisotropy decay, demonstrating that spectral diffusion is not yet complete even when the transition dipole has completely randomized. To prevent chemical decomposition of the BH₄⁻, 1 M NaOH was added to stabilize the system. 2D-IR experiments on the OD stretch of HOD in the NaOH/water liquid (no borohydride) show that the NaOH has a negligible effect on the bulk water dynamics.

Preparation of hollow poly(vinylidene fluoride) capsules containing nickel catalyst for hydrogen storage and production

Summary Hollow polymer capsules offer an approach for storage of hydrogen. Thus, in this paper, hollow poly(vinylidene fluoride) capsules were prepared by phase inversion of a polyvinylidene fluoride solution containing sodium borohydride that reacts with water to produce hydrogen during the phase separation. The effects of additives on the structure of the capsules were observed by scanning electronic microscopy and on the adsorption property were investigated by adsorbing sodium borohydride. The effects of the amount of capsules, concentration of sodium borohydride, and temperature on hydrogen production were studied via catalytic hydrolysis of sodium borohydride in aqueous solution. It was noticed that the capsules have good catalytic activity for hydrolysis of sodium borohydride with an activation energy of 49.3 kJ mol−1. And the capsules can be used for adsorption of sodium borohydride in tetrahydrofuran before catalytic hydrolysis of sodium borohydride in water. Copyright © 2014 John Wiley & Sons, Ltd.

Electrocatalysis of carbon black- or chitosan-functionalized activated carbon nanotubes-supported Pd with a small amount of La2O3 towards methanol oxidation in alkaline media

The Pd/C catalysts with and without a small amount of La2O3 were synthesized by a simple reduction reaction with sodium borohydride in aqueous solution. The structure and morphology of these catalysts were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy and transmission electron microscopy. The electrocatalytic performance of these catalysts for methanol oxidation in alkaline media was investigated using cyclic voltammetry, chronoamperometry and CO stripping experiments. The results show that the Pd–La2O3/C catalyst has a higher catalytic activity than the Pd/C catalyst, but the effect of La2O3 cannot be explained by a bi-functional mechanism. X-Ray photoelectron spectroscopy analyses suggest that the higher content of metallic Pd caused by the addition of La2O3 contributes to the better catalytic activity of Pd–La2O3/C. Based on the good electrocatalytic performance of Pd–La2O3/C, the Pd–La2O3 catalyst supported on chitosan (CS)-functionalized activated carbon nanotubes was prepared, and it exhibited a better catalytic activity. The improvement is attributed to the good dispersion status of metal particles and the further increase of metallic Pd due to the presence of CS.

Yolk-shell Fe(0)@SiO2 nanoparticles as nanoreactors for fenton-like catalytic reaction.

Yolk-shell nanoparticles (YSNs) with active metal cores have shown promising applications in nanoreactors with excellent catalytic performance. In this work, Fe(0)@SiO2 YSNs were synthesized by a sequential "two-solvents" impregnation-reduction approach. Specifically, FeSO4 aqueous solution was introduced into the preformed hollow mesoporous silica spheres (HMSS), dispersed in n-hexane, via a "two-solvent" impregnation way. Subsequently, aqueous solution of sodium borohydride (NaBH4) was introduced into the cavity of HMSS by the same way, leading to the formation of Fe core inside the HMSS through the reaction between Fe(2+) and NaBH4. The resulting Fe(0)@SiO2 YSNs possess distinctive structures, including active cores, accessible mesoporous channels, protective shells, and hollow cavities. To present the catalytic performance of YSNs nanoreactors, Fenton-like catalytic oxidation of phenol was chosen as the model catalysis reaction. In addition to the Fe(0)@SiO2 YSNs, two other materials were also applied to the catalytic system for comparison, including Fe@SiO2 composites with iron nanoparticles sticking on the outer shells of HMSS (Fe@SiO2-DI) and bare iron nanoparticles without HMSS (bare Fe(0)), respectively. The catalytic results show that Fe(0)@SiO2 YSNs exhibit higher catalytic rate toward phenol removal at 2-fold and 4-fold as compared to that of Fe@SiO2-DI and bare Fe(0), indicating the outstanding catalytic property of YSNs nanoreactors. To further clarify the relationship between catalytic properties and structural characteristics, the adsorption experiments of the three samples were also performed in the absence of H2O2. Other than catalytic results, Fe(0)@SiO2 YSNs show slightly higher adsorption efficiency than the other two samples, indicating the accessibility of nanoreactors. This result demonstrates that the removal of phenol in the oxidation system of Fe(0)@SiO2 YSNs may have contributed to the structure-enhanced effect of YSNs as nanoreactors.

Synthesis and evaluation of antioxidant, antimicrobial and antifungal effect of [(5-hydroxymethyl-1H-imidazole-4-il)thio] acetic acids

By reduction of available [(1-aryl-5-formylimidazole-4-il)thio] acetic acids with sodium borohydrideinaqueous solution in presence of 20% solution of sodium hydroxide [(5-hydroxymethyl-1H-imidazole-4-il)thio] acetic acids were synthesized. Their structure was proved by results of measurements of IR-, NMR 1H and chromatography-mass pectra. Primary screening of antioxidant properties showed that in in vitro experiments all of the studied compounds are active in range of concentrations between10-1-10-3mole/l, and the highest antioxidant effect is shown by {[5-hydroxymethyl-1-(3-methylphenyl)-1Н-imidazole-4-il]thio} acetic acid in concentration 10-3 М, which is credibly the same as the effect of thiotriazolin in the same concentration. It was found that the synthesized compounds show moderate antimicrobial and antifungal effect.

Biosynthesis of Silver nanoparticles from Actinomycetes for therapeutic applications

Silver is composed of a large percentage of silver oxide due to their large ratio of surface to bulk silver atoms. Silver nanoparticles have been a potent antibacterial, antifungal, anti-viral and anti-inflammatory agent. A simple, eco-friendly, inexpensive biosynthetic method was employed to synthesize silver nanoparticles. The present study aimed at the comparative study of silver nanoparticles synthesized through microbial and chemical methods. A microbial route to synthesize silver nanoparticles by Actinomycetes sp. was done. Actinomycetes are aerobic, Gram-positive bacteria, generally exhibiting branched filamentous growth and contain high guanine plus cytosine content in their DNA. Chemical methods were employed to synthesize silver nanoparticles. Chemical reduction of silver ions (Ag + ) using sodium borohydride in aqueous solution generally yields silver nanoparticles with particle diameters of several nanometers. It is observed that reduction is slow in chemical methods as compared to rapid microbial synthesis of silver nanoparticles. The obtained silver nanoparticles were characterized using UV-vis spectroscopy and TEM. TEM images of microbially synthesized silver nanoparticles were of smaller size (10-20 nm) compared to chemical methods (60-80 nm). The microbially synthesized silver nanoparticles using Actinomycetes were found to be highly toxic to bacteria and it was found that smaller silver nanoparticles synthesized by microbial route had a greater antibacterial activity when compared to their chemical moieties.

Electrocatalysis of carbon black- or poly(diallyldimethylammonium chloride)-functionalized activated carbon nanotubes-supported Pd–Tb towards methanol oxidation in alkaline media

The Pd–Tb/C catalysts with different Pd/Tb ratios were synthesized by a simple simultaneous reduction reaction with sodium borohydride in aqueous solution. The structure and morphology of those catalysts had been characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The electrocatalytic performance of those catalysts for methanol oxidation in alkaline media was investigated using cyclic voltammetry (CV), linear sweep voltammetry (LSV) and CO stripping experiments. It is found that the 20%Pd–1%Tb/C catalyst has a higher catalytic activity than the 20%Pd/C catalyst, but the effect of Tb cannot be explained by a bi-functional mechanism. According to the X-Ray photoelectron spectroscopy (XPS) analyses, it is suggested that the higher content of metallic Pd caused by the addition of Tb contributes to the better catalytic activity of 20%Pd–1%Tb/C. Based on the good electrocatalytic performance of 20%Pd–1%Tb/C, the 20%Pd–1%Tb catalyst supported on poly(diallyldimethylammonium chloride) (PDDA)-functionalized activated carbon nanotubes was prepared, and it exhibits a better catalytic activity. The improvement mainly results from the further increase of metallic Pd due to the presence of PDDA.

Ruthenium(0) nanoparticles supported on xonotlite nanowire: a long-lived catalyst for hydrolytic dehydrogenation of ammonia-borane

Ruthenium(0) nanoparticles supported on xonotlite nanowire (Ru(0)@X-NW) were prepared by the ion exchange of Ru(3+) ions with Ca(2+) ions in the lattice of xonotlite nanowire followed by their reduction with sodium borohydride in aqueous solution at room temperature. Ru(0)@X-NW were characterized by a combination of advanced analytical techniques. The results show that (i) highly dispersed ruthenium(0) nanoparticles of 4.4 ± 0.4 nm size were formed on the surface of xonotlite nanowire, (ii) Ru(0)@X-NW show high catalytic activity in hydrogen generation from the hydrolytic dehydrogenation of ammonia borane with a turnover frequency value up to 135 min(-1) at 25.0 ± 0.1 °C. (iii) They provide unprecedented catalytic life time (TTO = 134,100) for hydrogen generation from the hydrolysis of ammonia borane at 25.0 ± 0.1 °C. (iv) The results of a kinetic study on the hydrogen generation from the hydrolysis of ammonia borane were also reported including the activation energy of 77 ± 2 kJ mol(-1) for this reaction.

Iridium(0) nanoparticles dispersed in zeolite framework: A highly active and long-lived green nanocatalyst for the hydrogenation of neat aromatics at room temperature

The complete hydrogenation of aromatic molecules is one of the key transformation employed in the synthetic and petroleum chemistry. Described herein is a new catalytic nanomaterial for the hydrogenation of neat aromatics under mild conditions. A novel nanocatalyst, consisting of iridium(0) nanoparticles stabilized by zeolite with FAU framework could reproducibly been prepared from the reduction of iridium(III)-exchanged zeolite in an aqueous sodium borohydride solution at room temperature and characterized by ICP-MS, P-XRD, HRTEM, XPS, N2-Ads.-Des., and P(C6H11)3 poisoning. The results reveal the formation of iridium(0) nanoparticles of 5.8 ± 2.1 nm size dispersed on the external surface along with iridium(0) nanolclusters in cavities of zeolite-Y whereby the host matrix remains intact. The resulting iridium(0) nanoparticles were employed as heterogeneous catalyst in the hydrogenation of various aromatic substrates (benzene, toluene, o-xylene and mesitylene) in the solvent-free systems at room temperature and 3bar initial H2 pressure. They are highly active catalyst in the hydrogenation of neat aromatics, such as they can completely hydrogenate benzene to cyclohexane with an initial turnover frequency value of TOF=3215h−1. Moreover, they show high durability against to leaching and sintering throughout the catalytic runs, which make them reusable catalyst. More importantly, testing the catalytic lifetime of our iridium(0) nanoparticles showed that they provide previously unprecedented total turnover number of TTO=197,000 over 92h before deactivation in the hydrogenation of benzene at room temperature and 3bar initial H2 pressure.