Palladium nanoparticles on silica-rich substrates by spontaneous reduction at room temperature

Pina-Zapardiel, R.; Montero, I.; Esteban‐Cubillo, Antonio; Moya, José S.; Kaplan, Wayne D.; Thangadurai, P.; Pecharromán, Carlos

doi:10.1007/s11051-011-0508-7

Cited by 10 publications

(6 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…43 Thus, the clay sheet with Pt nanoparticles did not form regular lamellar stacks with well-defined spacing. Although the XRD pattern shows no crystalline peaks for Pt nanoparticles, probably because of small Pt, 50 the XPS spectra of the nanostructured Pt−clay material (Figure 5b) provide definite evidence for the presence of reduced Pt via two principal peaks at binding energy values of 72.1 eV (4f 7/2 ) and 76 eV (4f 5/2 ). This suggests that the Pt species has been completely reduced to its metallic state, Pt(0).…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…Pt nanoparticles are then generated, and they undergo well-controlled growth while adhering to the clay platelets. Recently, Pd species were shown to possibly undergo reduction by silanol moieties on silica-rich substrates, although almost no information was provided on the role of the silanol groups. In the aqueous clay dispersion in the present study, it is feasible that the silanol groups on the surfaces of the exfoliated clay platelets induce the relatively mild in situ reduction of the Pt species.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Highly Active and Thermally Stable Nanostructured Pt/Clay Materials by Clay-Mediatedin SituReduction

Varade

Haraguchi

2013

Langmuir

View full text Add to dashboard Cite

Novel and intriguing one-pot in situ method for the preparation of nanostructured Pt-clay materials under simple conditions is reported. In this synthesis, an inorganic clay mineral such as synthetic hectorite ("Laponite XLG") or natural montmorillonite ("Kunipia F") serves as a mild and effective reducing agent for Pt ions, which is uncommon for such a clay system, and also acts as an outstanding stabilizer for the resulting Pt nanoparticles. In aqueous solution, exfoliated colloidal clay platelets forms complex with Pt ions in the initial stage of mixing. Devoid of any organic dispersants or external reducing agents, subsequently, the Pt nanoparticles (3-6 nm) generated by clay-assisted in situ reduction of Pt ions successfully anchored onto the clay nanoplatelets. The Pt-clay material features a very high surface area (312 m(2) g(-1)) and has excellent catalytic activity, as was kinetically evaluated via the reduction of 4-nitrophenol with NaBH(4). After drying, this remarkably stable nanocomposite is completely redispersible in water and displays extreme thermal stability (up to 500 °C). On the basis of these results, this synthetic strategy is anticipated to be a very simple, economical, and green approach for the synthesis of nanostructured Pt-clay materials.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Synthesis of Highly Active and Thermally Stable Nanostructured Pt/Clay Materials by Clay-Mediatedin SituReduction

Varade

Haraguchi

2013

Langmuir

View full text Add to dashboard Cite

show abstract

“…Examples include catalysis [101][102][103], porous electrodes [104,105], and more recently charge storage for memory applications [106][107][108].…”

Section: Spinoidal Dewetting Versus Nucleation Of Holesmentioning

confidence: 99%

A review of wetting versus adsorption, complexions, and related phenomena: the rosetta stone of wetting

et al. 2013

Self Cite

View full text Add to dashboard Cite

This paper reviews the fundamental concepts and the terminology of wetting. In particular, it focuses on high temperature wetting phenomena of primary interest to materials scientists. We have chosen to split this review into two sections: one related to macroscopic (continuum) definitions and the other to a microscopic (or atomistic) approach, where the role of chemistry and structure of interfaces and free surfaces on wetting phenomena are addressed. A great deal of attention has been placed on thermodynamics. This allows clarification of many important features, including the state of equilibrium between phases, the kinetics of equilibration, triple lines, hysteresis, adsorption (segregation) and the concept of complexions, intergranular films, prewetting, bulk phase transitions versus ''interface transitions'', liquid versus solid wetting, and wetting versus dewetting.

show abstract

“…XRD pattern for the as-prepared Pt/Clay showed no crystalline peaks for the Pt nanoparticles, probably because of the very small particle size. 31 Furthermore, the XRD spectrum was unchanged upon subsequent calcination at 300 °C indicating absolutely intact structure. However, data revealed small but sharp signals for crystalline Pt after calcination at 500 °C, attributable to the minor growth of the particles owing to their coarsening, which is consistent with the TEM observation.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Superior CO Catalytic Oxidation on Novel Pt/Clay Nanocomposites

Varade

Abe

Yamauchi

et al. 2013

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Nanostructured novel Pt/Clay nanocomposites consisting of well-defined Pt nanoparticles prepared by clay-mediated in situ reduction displays very high thermal stability, large BET surface area and superior catalytic activity for CO oxidation as compared to a model reference Pt/SiO2 catalysts. CO oxidation has attracted renewed attention because of its technological importance in the area of pollution control. The Pt/Clay system consisting of Pt nanoparticles strongly immobilized between the atomic layers of clay inhibits nanoparticle sintering and loss of catalytic activity even after prolonged heating at high temperatures. At elevated temperatures (300 °C), the Pt/Clay system demonstrates significant enhancement of catalytic activity, with almost 100% CO conversion in less than 5 min. Emphasis is given to the role played by the clay supporting material which is chemically and thermally stable under the catalytic conditions of exhaust purification.

show abstract

Palladium nanoparticles on silica-rich substrates by spontaneous reduction at room temperature

Cited by 10 publications

References 45 publications

Synthesis of Highly Active and Thermally Stable Nanostructured Pt/Clay Materials by Clay-Mediatedin SituReduction

Synthesis of Highly Active and Thermally Stable Nanostructured Pt/Clay Materials by Clay-Mediatedin SituReduction

A review of wetting versus adsorption, complexions, and related phenomena: the rosetta stone of wetting

Superior CO Catalytic Oxidation on Novel Pt/Clay Nanocomposites

Contact Info

Product

Resources

About