Highly active electron-deficient Pd clusters on N-doped active carbon for aromatic ring hydrogenation

Nie, Renfeng; Jiang, Hezhan; Lu, Xinhuan; Zhou, Dan; Xia, Qinghua

doi:10.1039/c5cy01418b

Cited by 113 publications

(74 citation statements)

References 49 publications

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“…The small size of Pt clusters may also result in suitable H‐spillover effect for further improving the activity than larger Pt particles . In addition, the strong interaction between Pt clusters and support would result in lower reducibility of Pt species with a relative electron‐deficient structure, thus promoting the adsorption of hydrogen and leading to high hydrogenation activity . Based on the hydroisomerization mechanism of n ‐alkanes, the small size and high dispersion of Pt can effectively enhance contact chance between Pt and acid sites .…”

Section: Resultsmentioning

confidence: 99%

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

et al. 2019

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The significant increase of catalytic efficiency while remaining low Pt usage is constantly pursued, but remains a challenge. Here, a “vacuum‐assisted” (VA) process toward Pt clusters dispersed on SAPO‐11 (S‐11) is shown for a high‐effective hydroisomerization of n‐C16. The VA can make effective trapping of the Pt precursor on S‐11 due to intensive capillary action, being conductive to stabilize and disperse Pt cluster (≈1 nm) on S‐11 (V‐Pt/S‐11) for promoting synergy of Pt sites and acid sites on S‐11. The test indicates excellent catalytic activity and stability of trace Pt clusters (0.15 wt%, even lower, 0.035 wt%) on S‐11 (≈94.4% isomer selectivity at 94.3% conversion), much superior to I‐0.15 wt% Pt/S‐11 from traditional impregnation routes (≈88% selectivity at 90% conversion) and ever reported catalysts. The V‐Pt/S‐11 is also superior for the hydroisomerization of catalytic diesel oil with a decrease of freezing point up to 40 °C after hydroisomerization. The superior performance is attributed to the exposure of high acid density due to little coverage of Pt cluster on S‐11, high dispersion of Pt leading to form more metal–acid bifunctional sites, and enhanced (de)hydrogenation ability of Pt clusters. All of them can promote the effective synergy of metal sites (Pt) and acid sites.

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Section: Resultsmentioning

confidence: 99%

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

et al. 2019

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“…Interestingly, some researchers have reported that the emerged nitride functional groups on the carrier are beneficial to improving the properties of the third functional component through constructing the interaction between nitride groups and other functional species just like the metal ions, nanoparticles or complexes . For example, Datta et al., demonstrated that the Au nanoparticles were successfully embedded in MCN due to the nitride groups on the MCN walls providing a platform for constructing special metal nanoparticles .…”

Section: Introductionmentioning

confidence: 99%

Stabilized Pony‐Sized‐CuFe₂O₄/Carbon Nitride Porous Composites with Boosting Fenton‐like Oxidation Activity

Yang

Lin

et al. 2018

ChemistrySelect

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In this study, pony‐sized Copper ferrite (CuFe2O4) nanoparticles were directly obtained and synchronously stabilized on nanoporous carbon nitride (MCN) named as CuFe2O4‐MCN, which emerges interestingly as a magnetically‐recycling heterogeneous Fenton‐like catalyst. The Fourier Transform Infrared, X‐ray diffraction, N2 desorption, X‐ray photoelectron spectroscopy and transmission electron microscopy were seriatim used to characterize these synthesized functional catalysts. These present results demonstrated that CuFe2O4‐MCN afford appreciable physical textural characteristics including well‐defined porous structure, advisable surface area and pore volume. The interaction between CuFe2O4 and MCN and its induced improved dispersion of CuFe2O4 NPs on MCN could be confirmed through XPS, FT‐IR, and TEM evidences. Impressively, the resulted CuFe2O4‐MCN composites exhibited a three times’ catalytic activity (kobs, 0.076 min−1) than that (kobs, 0.026 min−1) of mechanical mixture CuFe2O4‐MCN(M) in 4‐chlorophenol(CP) degradation. CuFe2O4‐MCN porous composites was further evaluated in catalysis according to various controlled parameters, including catalyst loading, H2O2 concentration, catalyst dosage and pH of 4‐CP degradation. At last, the catalytic stability of CuFe2O4‐MCN composites was investigated via magnetic recycling and reusage in next catalytic test. After three successive experimental runs, the porous structure and catalytic activity of CuFe2O4‐MCN catalysts remained constant.

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“…Hence, a large number of heterogeneous supports e. g. porous silica, nanoporous organic polymers (POPs), metal oxides, N‐doped activated carbon, amorphous carbon etc. are reported, which shows quite promise and potential in anchoring metal NPs for catalysis, but hierarchical micro‐mesoporous support with uniform hollow nanostructure could be more promising…”

Section: Introductionmentioning

confidence: 99%

Pt and Pd Nanoparticles Immobilized on Amine-Functionalized Hypercrosslinked Porous Polymer Nanotubes as Selective Hydrogenation Catalyst for α,β-Unsaturated Aldehydes

2017

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Selective hydrogenation reaction over supported metal nanoparticles (NPs) through activation of molecular H2 is very demanding in the context of maintaining atom efficiency in chemical reactions. Although high selectivity is difficult to achieve in the reaction, but it is very challenging. In this research, we separately deposited Pd and Pt NPs on nanoporous hollow polymer tubes (PP‐3) and studied their efficiency in hydrogenation of α,β‐unsaturated aldehydes as substrates. We found hydrogenation selectivity over these two types of catalysts (Pd@PP‐3 and Pt@PP‐3) were entirely different. Pt@PP‐3 shows high selectivity in the hydrogenation of C=O bonds, producing unsaturated alcohol in high yield, whereas Pd@PP‐3 only hydrogenates C=C bonds and forms saturated aldehyde as the major product. Pd@PP‐3 and Pt@PP‐3 were thoroughly characterized by PXRD, N2 sorption, TEM, XPS, CO stripping experiment and in‐situ CO adsorption FT‐IR studies. Our research implies the utility of porous organic polymers as support for metal NPs mediated hydrogenation reactions.

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Highly active electron-deficient Pd clusters on N-doped active carbon for aromatic ring hydrogenation

Abstract: Pyridinic nitrogen species in N-doped active carbon (xN-AC) are responsible for high activity of ring hydrogenation via the formation of a high percentage of electron-deficient Pd clusters.

Cited by 113 publications

References 49 publications

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

Stabilized Pony‐Sized‐CuFe₂O₄/Carbon Nitride Porous Composites with Boosting Fenton‐like Oxidation Activity

Pt and Pd Nanoparticles Immobilized on Amine-Functionalized Hypercrosslinked Porous Polymer Nanotubes as Selective Hydrogenation Catalyst for α,β-Unsaturated Aldehydes

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Highly active electron-deficient Pd clusters on N-doped active carbon for aromatic ring hydrogenation

Abstract: Pyridinic nitrogen species in N-doped active carbon (xN-AC) are responsible for high activity of ring hydrogenation via the formation of a high percentage of electron-deficient Pd clusters.

Cited by 113 publications

References 49 publications

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

Stabilized Pony‐Sized‐CuFe2O4/Carbon Nitride Porous Composites with Boosting Fenton‐like Oxidation Activity

Pt and Pd Nanoparticles Immobilized on Amine-Functionalized Hypercrosslinked Porous Polymer Nanotubes as Selective Hydrogenation Catalyst for α,β-Unsaturated Aldehydes

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Stabilized Pony‐Sized‐CuFe₂O₄/Carbon Nitride Porous Composites with Boosting Fenton‐like Oxidation Activity