Unsupported PVA- and PVP-stabilized Pd nanoparticles as catalyst for nitrite hydrogenation in aqueous phase

Zhao, Yingnan; Baeza, J.A.; Rao, N. Koteswara; Calvo, L.; Gilarranz, Miguel Á.; Li, Y.D.; Lefferts, Leon

doi:10.1016/j.jcat.2014.07.011

Cited by 67 publications

(54 citation statements)

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“…lower Pd accessibility resulted in few Pd active sites with strengthened catalytic ability). 24 According to previous studies, 37,39 the FA dehydrogenation reaction mechanism goes through a palladium-formate (Pd-[HCOO] -) intermediate, and therefore the catalytic performance is strongly dependent on the Pd surface features. The Pd surface deactivation due to the occupation of active sites by reaction intermediates compounds (such as H + , CO 2 , H 2 O and/or HCOO -) has been also studied by Hu et al.…”

Section: Resultsmentioning

confidence: 99%

“…This H 2 production is very low compared with the PVP capped Pd NPs, which evidenced the potential beneficial effects of the capping agent in catalyst synthesis, as it was previously reported elsewhere. 9,24 The strong dependence of the catalytic performance on the PVP/Pd ratio and aging time might be related to the Pd NPs characteristics, in terms of catalytic sites accessibility, NPs size, or electronic features. Then, to elucidate the influence of the studied parameters in the catalytic behaviour towards the H 2 production from the FA dehydrogenation, further characterisation results are included in the following section.…”

Section: Resultsmentioning

confidence: 99%

“…11,13,24 The coating of the polymer around the NP prevents their agglomeration and is also responsible for the reduction of its available surface due to the partial blocking of possible active sites in the reaction. However, the beneficial effect of the PVP presence on the NPs surface must be taken into account.…”

Section: Resultsmentioning

confidence: 99%

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Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

et al. 2016

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Palladium nanoparticles (Pd NPs) were synthesised by the reduction-by-solvent method using polyvinylpirrolidone (PVP) as capping agent. The non-static interaction between PVP and the metallic surface may change the properties of the NPs due to the different possible interactions, either through the O or N atoms of the PVP. In order to analyse these effects and their repercussion in their catalytic performance, Pd NPs with various PVP/Pd molar ratios (1, 10 and 20) were prepared, deposited on silica and tested in the formic acid decomposition reaction. The catalytic tests were conducted using catalysts prepared by loading NPs with three different time lapses between their purification and their deposition on the silica support (1 day, 1 month, and 6 months). CO adsorption, FTIR spectroscopy, XPS and TEM characterisation were used to determine the accessibility of the Pd NPs surface sites, electronic state of Pd and the average NPs size, respectively. The H 2 production from the formic acid decomposition reaction has a strong dependence with the Pd surface features, which in turn are related to the NPs aging time due to the progressive removal of the PVP.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

et al. 2016

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“…37 Considering the benefits of polymer modification on the activity and stability of catalysts, 10,[46][47][48][49][50] some polymers were introduced into Fe 3 O 4 @nSiO 2 @NiPd and a PVP modified catalyst (Fe 3 O 4 @nSiO 2 @NiPd-PVP) showed the best catalytic performance among them. We speculate that the loss of Ni species and the aggregation of the active components should be the main reasons for the catalyst deactivation in water.…”

Section: Screening Of Catalystsmentioning

confidence: 99%

A novel Fe₃O₄@nSiO₂@NiPd–PVP@mSiO₂ multi-shell core–shell nanocomposite for cinnamic acid hydrogenation in water

et al. 2015

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A novel Fe3O4@nSiO2@NiPd-PVP@mSiO2 multi-shell core-shell nanocomposite, with a Brunauer-Emmet-Teller surface area as high as 304.5 m 2 /g, has been prepared by the combination of a modified Stöber method, impregnation reduction and surfactant-templating method. It has a multi-shell structure with ferroferric oxide as core, an inner nonporous silica shell, polyvinylpyrrolidone (PVP) dispersed Ni and Pd active species, and an outer mesoporous silica shell in sequence, as confirmed by transmission electron microscopy and nitrogen adsorption-desorption. It showed an excellent catalytic performance in the selective hydrogenation of cinnamic acid to hydrocinnamic acid under relatively mild reaction conditions and can be recycled efficiently. Furthermore, it also exhibited good catalytic activity and stability in the hydrogenation of a number of unsaturated substrates in water. It was demonstrated that addition of small amounts of Pd can markedly improve its activity. The combination of PVP and the outer mesoporous silica shell can not only disperse the active species but also suppress their loss or aggregation during the reaction, accounting for its good stability in water.

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“…Many, monometallic and bimetallic transition nanoparticles are used for reduction of this compounds (Oh et al 2008;Kim and Choi 2009). Up to now, various metallic and bimetallic catalyst has been reported such as PVP-Pd (Zhao et al 2014), Pd-M (M=Ag, Au, Cu, Ni, and Pt) (Oh et al 2008), Pt-Ni (Ghosh et al 2004), Ag-Pd , hollow Ag (Vadakkekara, Chakraborty, and Parikh 2012), Au-Ag (Shankar et al 2004), and CuO (Nandanwar and Chakraborty 2012). Hwang et al (2008) reported PVP-Pd colloids by γ-irradiation method and compared with reduction of aromatic nitro compounds.…”

Section: Introductionmentioning

confidence: 99%

Kinetics study of a palladium–nickel colloidal nanocatalyst synthesized by a wet-chemical method for reduction of nitrophenol, nitroaniline, and 4-nitrobenzo-15-crown compounds

Madavi

Nandanwar

Chakraborty

2016

Particulate Science and Technology

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Bimetallic, palladium-nickel (Pd-Ni) stable colloidal nanocatalyst was synthesized by wetchemical reduction technique using AOT as surfactant and hydrazine hydrate as a reducing agent.The particle size of colloidal nanocatalyst was controlled by varying precursor concentration, reducing agent, and surfactant concentration. The particle size and morphology of colloidal catalyst were investigated by dynamic light scattering (DLS) and transmission electron microscopy (TEM), respectively. TEM images shows the actual particle size of Pd-Ni nanocatalysts were in the range of 10-28 nm at 10 mM concentration of AOT and hydrazine hydrate. The activity of colloidal catalyst (bimetallic) was evaluated for reduction of nitro aromatic compounds which includes 4-NP, 3-NP, 2-NP, 4-nitrobenzo-15-crown and 4-NA. The rate constant of Pd-Ni colloidal nanocatalyst indicate that activity of bimetallic catalyst was higher than the monometallic catalyst for various nitro compounds. The rate constant of 4-nitrophenol was found to be ~61 × 10 2 min 1 at room temperature.

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Unsupported PVA- and PVP-stabilized Pd nanoparticles as catalyst for nitrite hydrogenation in aqueous phase

Cited by 67 publications

References 50 publications

Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

A novel Fe₃O₄@nSiO₂@NiPd–PVP@mSiO₂ multi-shell core–shell nanocomposite for cinnamic acid hydrogenation in water

Kinetics study of a palladium–nickel colloidal nanocatalyst synthesized by a wet-chemical method for reduction of nitrophenol, nitroaniline, and 4-nitrobenzo-15-crown compounds

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Unsupported PVA- and PVP-stabilized Pd nanoparticles as catalyst for nitrite hydrogenation in aqueous phase

Cited by 67 publications

References 50 publications

Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

A novel Fe3O4@nSiO2@NiPd–PVP@mSiO2 multi-shell core–shell nanocomposite for cinnamic acid hydrogenation in water

Kinetics study of a palladium–nickel colloidal nanocatalyst synthesized by a wet-chemical method for reduction of nitrophenol, nitroaniline, and 4-nitrobenzo-15-crown compounds

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A novel Fe₃O₄@nSiO₂@NiPd–PVP@mSiO₂ multi-shell core–shell nanocomposite for cinnamic acid hydrogenation in water