Probing Pd–carbon interaction in Pd/C catalysts by EXAFS

Lin, Shawn D.; Hsu, Yin-Hou; Jen, Po-Hau; Lee, Jyh‐Fu

doi:10.1016/j.molcata.2005.05.004

Cited by 14 publications

(8 citation statements)

References 33 publications

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“…EXAFS results reported in Table 2 and that by Lin et al [25] can provide information about the Pd/C deactivation phenomenon. The fresh impregnated Pd/C and the mildly reduced Pd/C catalysts by NaBH 4 show a Pd-C interaction at ca.…”

Section: Discussionmentioning

confidence: 82%

“…The Pd particle growth is also found after thermal treatment (He, 573 K for 1 h) following NaBH 4 reduction, but to a smaller extent than the hydrogen treatment. An increase in Pd-Pd coordination number is also found after benzene hydrogenation; the Pd-Pd coordination number increased more at higher reaction temperatures [25]. Comparatively, the highest Pd-Pd coordination number (i.e., the largest Pd particles) occurred when the fresh catalyst was directly reduced by H 2 at 573 K for all the catalysts analyzed in Table 2.…”

Section: Catalyst Characterizationmentioning

confidence: 74%

“…The presence of Pd-C interaction at a distance of ca. 3.6 Å has been discussed earlier [25,26]. Reduced and highly dispersed Pd is obtained after NaBH 4(aq) reduction at 298 K. The presence of Pd-O coordination in the reduced Pd/C catalysts is attributed to the adsorbed oxygen because EXAFS measurements were done ex situ.…”

Section: Catalyst Characterizationmentioning

confidence: 76%

“…Our EXAFS analyses show no Pd-C coordination at direct Pd-C bond distance at ca. 2 Å (as shown in Table 2 and in [25]). The Pd-O at ca.…”

Section: Discussionmentioning

confidence: 91%

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The activity and stability of Pd/C catalysts in benzene hydrogenation

2007

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Section: Discussionmentioning

confidence: 82%

Section: Catalyst Characterizationmentioning

confidence: 74%

Section: Catalyst Characterizationmentioning

confidence: 76%

“…Our EXAFS analyses show no Pd-C coordination at direct Pd-C bond distance at ca. 2 Å (as shown in Table 2 and in [25]). The Pd-O at ca.…”

Section: Discussionmentioning

confidence: 91%

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The activity and stability of Pd/C catalysts in benzene hydrogenation

2007

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“…Specific BET surface area of Pd-doped MWCNT sample started to increase due to the exposure of the nanophase Pd particles loaded on the surface of MWCNTs to hydrogen reduction, which might induce the microporosity and perfections in the carbon structures. [53,56,64]. Therefore, the absorption was intensive at 3d → 5s or 4p hybridization.…”

Section: Resultsmentioning

confidence: 99%

Characterization and Hydrogen Storage of Surface‐Modified Multiwalled Carbon Nanotubes for Fuel Cell Application

Lin

Mai

et al. 2012

Journal of Nanomaterials

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The synthesis, identification, and H2storage of multiwalled carbon nanotubes (MWCNTs) have been investigated in the present work. MWCNTs were produced from the catalytic-assembly solvent (benzene)-thermal (solvothermal) route. Reduction of C6Cl6with metallic potassium was carried out in the presence of Co/Ni catalyst precursors at 503–623 K for 12 h. XRD patterns indicated that the abstraction of Cl from hexachlorobenzene and the formation of KCl precipitates were involved in the early stage of the synthesis process of MWCNTs. This result offers further explanation for the formation of MWCNT structure and yield using the solvothermal route depending on the Co/Ni catalyst precursors. The diameter of MWCNTs ranged between 30 and 100 nm and the H2storage capacity of MWCNTs improved when 2.7–3.8 wt% Pd or NaAlH4were doped. The XANES/EXAFS spectra revealed that the Co/Ni catalyst precursors of the MWCNT synthesis were in metallic form and Pd atoms possessed a Pd–Pd bond distance of 2.78 Å with a coordination number of 9.08. Ti-NaAlH4or Pd nanoparticles were dispersed on MWCNTs and facilitated to improve the H2storage capacity significantly with the surface modification process.

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Palladium on Nitrogen‐Doped Mesoporous Carbon: A Bifunctional Catalyst for Formate‐Based, Carbon‐Neutral Hydrogen Storage

et al. 2016

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The lack of safe, efficient, and economical hydrogen storage technologies is a hindrance to the realization of the hydrogen economy. Reported herein is a reversible formate-based carbon-neutral hydrogen storage system that is established over a novel catalyst comprising palladium nanoparticles supported on nitrogen-doped mesoporous carbon. The support was fabricated by a hard template method and nitridated under a flow of ammonia. Detailed analyses demonstrate that this bicarbonate/formate redox equilibrium is promoted by the cooperative role of the doped nitrogen functionalities and the well-dispersed, electron-enriched palladium nanoparticles.

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Probing Pd–carbon interaction in Pd/C catalysts by EXAFS

Cited by 14 publications

References 33 publications

The activity and stability of Pd/C catalysts in benzene hydrogenation

The activity and stability of Pd/C catalysts in benzene hydrogenation

Characterization and Hydrogen Storage of Surface‐Modified Multiwalled Carbon Nanotubes for Fuel Cell Application

Palladium on Nitrogen‐Doped Mesoporous Carbon: A Bifunctional Catalyst for Formate‐Based, Carbon‐Neutral Hydrogen Storage

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