PdAu-MnO  nanoparticles supported on amine-functionalized SiO2 for the room temperature dehydrogenation of formic acid in the absence of additives

Karataş, Yaşar; Bulut, Ahmet; Ertaş, İlknur Efecan; Alal, Orhan; Gülcan, Mehmet; Çelebı, Metın; Kıvrak, Hilal; Kaya, Murat; Zahmakıran, Mehmet

doi:10.1016/j.apcatb.2015.06.060

Cited by 128 publications

(83 citation statements)

References 40 publications

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“…A wide variety of bimetallic and trimetallic Pd-based catalysts have been recently reported, e.g. AuPd [36,37], PdNi [38], PdCo [39], PdCu [40], AuPdAg [41], CoAgPd [42] and NiAuPd [43] nanoparticles showing that the enhancement in the catalytic performance is mainly due to electronic and geometric effects.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Generation from Additive-Free Formic Acid Decomposition Under Mild Conditions by Pd/C: Experimental and DFT Studies

et al. 2018

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Safe and efficient hydrogen generation and storage has received much attention in recent years. Herein, a commercial 5 wt% Pd/C catalyst has been investigated for the catalytic, additive-free decomposition of formic acid at mild conditions, and the experimental parameters affecting the process systematically have been investigated and optimised. The 5 wt% Pd/C catalyst exhibited a remarkable 99.9% H 2 selectivity and a high catalytic activity (TOF = 1136 h −1 ) at 30 °C toward the selective dehydrogenation of formic acid to H 2 and CO 2 . The present commercial catalyst demonstrates to be a promising candidate for the efficient in-situ hydrogen generation at mild conditions possibiliting practical applications of formic acid systems on fuel cells. Finally DFT studies have been carried out to provide insights into the reactivity and decomposition of formic acid along with the two-reaction pathways on the Pd (111) surface.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Generation from Additive-Free Formic Acid Decomposition Under Mild Conditions by Pd/C: Experimental and DFT Studies

et al. 2018

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“…Chitosan subunit has been selected in the preparation of electrospun polymeric nanofibers because of its NH 2 groups, which may act as ligand stabilizer to surface bound Ni-NP. Some of us have already reported that the existence of surface grafted NH 2 groups on solid support materials can act as stabilizing agents to supported PdAuCr [52], PdAg-MnO x [53], PdAu-MnO x [54] and Pd-MnO x [55] nanoparticles. Ni-NP/ENF catalyst was simply and reproducibly prepared through surfactant-free deposition-in-situ reduction technique [56] at room temperature, and characterized by inductively coupled plasma-optical emission spectroscopy (ICP-OES), powder X-ray diffraction (P-XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), bright field transmission electron microscopy (BFTEM) and high resolution transmission electron microscopy (HR-TEM).…”

Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles decorated on electrospun polycaprolactone/chitosan nanofibers as flexible, highly active and reusable nanocatalyst in the reduction of nitrophenols under mild conditions

Karakaş

Çelebioğlu

Çelebı

et al. 2017

Applied Catalysis B: Environmental

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a b s t r a c tToday, the reduction of nitro aromatics stands a major challenge because of the pollutant and detrimental nature of these compounds. In the present study, we show that nickel(0) nanoparticles (Ni-NP) decorated on electrospun polymeric (polycaprolactone(PCL)/chitosan) nanofibers (Ni-NP/ENF) effectively catalyze the reduction of various nitrophenols (2-nitrophenol, 2,4-dinitrophenol, 2,4,6-trinitrophenol) under mild conditions. Ni-NP/ENF nanocatalyst was reproducibly prepared by deposition-reduction technique. The detailed characterization of these Ni-NP/ENF based nanocatalyst have been performed by using various spectroscopic tools including ICP-OES, P-XRD, XPS, SEM, BFTEM, HRTEM and BFTEM-EDX techniques. The results revealed the formation of well-dispersed nickel(0) NP (d mean = 2.71-2.93 nm) on the surface of electrospun polymeric nanofibers. The catalytic activity of the resulting Ni-NP/ENF was evaluated in the catalytic reduction of nitrophenols in aqueous solution in the presence of sodium borohydride (NaBH 4 ) as reducing agent, in which Ni-NP/ENF nanocatalyst has shown high activity (TOF = 46.2 mol 2-nitrophenol/mol Ni min; 48.2 mol 2,4-dinitrophenol/mol Ni min; 65.6 mol 2,4,6-trinitrophenol/mol Ni min). More importantly, due to the nanofibrous polymeric support, Ni-NP/ENF has shown a flexible characteristics along with reusability property. Testing the catalytic stability of Ni-NP/ENF revealed that this new catalytic material provides high reusability performance (at 3rd reuse 86% for 2-nitrophenol, 83% 2,4-dinitrophenol and 82% 2,4,6-trinitrophenol) for the reduction of nitrophenols even at room temperature and under air. The present study reported here also includes the compilation of wealthy kinetic data for Ni-NP/ENF catalyzed the reduction of nitrophenols in aqueous sodium borohydride solution depending on temperature and type of support material (Al 2 O 3 , C, SiO 2 ) to understand the effect of the support material and determine the activation parameters.

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“…In addition to the formation of small sized Pd NPs, these BFTEM images of the resulting Pd NPs also reveal that formation of nearly monodisperse Pd NPs resulting from their high dispersion in THF. HRTEM image (Figure (d)) of Pd NPs synthesized at [Pd]/[APTS]=1.0 molar ratio displays the highly crystalline feature of Pd NPs and the lattice spacing distance of an individual spherical particle was measured to be 0.22 nm, which corresponds to face centered cubic ( fcc ) Pd (111) spacing . EDX spectrum ( see Figure S1 , Supporting Information) of the resulting Pd NPs collected during their TEM analyses confirms the presence of Pd along with stabilizing ligand APTS elements (Si, N, etc .).…”

Section: Resultsmentioning

confidence: 80%

“…Of particular importance, apart from those aforementioned materials, notable catalytic performances with colloidal palladium nanoparticles (NPs) have been achieved in the catalytic reduction of Cr(VI) to Cr(III) by using formic acid (HCOOH) as reducing agent . Formic acid assisted catalytic reduction of Cr(VI) proceeds through two‐steps mechanism that involves ( i ) the catalytic dehydrogenation of formic acid (HCOOH → H 2 + CO 2 ) and then ( ii ) reduction of Cr(VI) to Cr(III) via H 2 transfer pathway on the surface of Pd NPs (Cr 2 O 7 2− + 8H + + 3H 2 → 2Cr 3+ +7H 2 O) . Although, these colloidal Pd NPs have provided high activities in these catalytic steps, they could not provide enough catalytic stability for both long term use and reusability, which restricts their practical application in the catalytic reduction of Cr(VI) to Cr(III) for environmental remediation.…”

Section: Introductionmentioning

confidence: 99%

Palladium Nanoparticles Decorated Graphene Oxide: Active and Reusable Nanocatalyst for the Catalytic Reduction of Hexavalent Chromium(VI)

et al. 2017

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Today, the catalytic reduction of Cr(VI) to Cr(III) stands one of the most important challenges in the environmental chemistry and catalysis due to highly stable, contaminant and toxic nature of Cr(VI). In this study, we show that a new nanocatalyst system comprised of 3-aminopropyltriethoxysilane (APTS) stabilized palladium(0) nanoparticles grafted onto the surface of graphene oxide (Pd/GO) efficiently works in the catalytic reduction of Cr(VI) to Cr(III) under mild reaction conditions. Pd/ GO nanocatalyst was reproducibly prepared through two-steps procedure: (i) H 2 reduction of Pd(dba) 2 (dba = dibenzylideneacetone) in the presence of APTS in THF to synthesize colloidal APTS stabilized palladium(0) nanoparticles and then (ii) the deposition of 3-aminopropyltriethoxysilane stabilized palladium (0) nanoparticles onto the surface of graphene oxide (GO) by impregnation. The characterization of Pd/GO was carried out by advanced analytical techniques. The summation of the results acquired from these analyses reveals that the formation of well-dispersed and highly crystalline palladium(0) nanoparticles on the surface of GO. The catalytic performance of the resulting Pd/GO in terms of activity and stability was assessed in the catalytic reduction of Cr(VI) to Cr(III) in aqueous solution in the presence of formic acid (HCOOH) as a reducing agent. We found that Pd/GO nanocatalyst exhibits high activity (TOF = 3.6 mol Cr 2 O 7 2 À /mol Pd 3 min) and reusability (> 90% at 5 th reuse) in this catalytic transformation at room temperature.[a] Dr.

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PdAu-MnO nanoparticles supported on amine-functionalized SiO2 for the room temperature dehydrogenation of formic acid in the absence of additives

Cited by 128 publications

References 40 publications

Hydrogen Generation from Additive-Free Formic Acid Decomposition Under Mild Conditions by Pd/C: Experimental and DFT Studies

Hydrogen Generation from Additive-Free Formic Acid Decomposition Under Mild Conditions by Pd/C: Experimental and DFT Studies

Nickel nanoparticles decorated on electrospun polycaprolactone/chitosan nanofibers as flexible, highly active and reusable nanocatalyst in the reduction of nitrophenols under mild conditions

Palladium Nanoparticles Decorated Graphene Oxide: Active and Reusable Nanocatalyst for the Catalytic Reduction of Hexavalent Chromium(VI)

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