SELECTIVE HYDROGENATION OF CINNAMALDEHYDE WITH Pt AND Pt-Fe CATALYSTS: EFFECTS OF THE SUPPORT

Silva, A.B. da; Jordão, Elizabete; Mendes, Mário J. G. C.; Fouilloux, P.

doi:10.1590/s0104-66321998000200007

Cited by 6 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also pure carbon supports showed such effects. 50,[54][55][56] The TPR curve for a pure silicon carbide (without nickel) gave negative values at temperatures higher than 550 °C (not shown here) as well. Accordingly, already small carbon impurities within the porous SiC samples, whose existence was already concluded from the extenuated slope in the TGA at around 600 °C, might be the reason for the observed TPR characteristics.…”

Section: Nickel-containing Catalyst Systemssupporting

confidence: 54%

Nanoporous silicon carbide as nickel support for the carbon dioxide reforming of methane

Hoffmann

Plate

Steinbrück

et al. 2015

Catal. Sci. Technol.

View full text Add to dashboard Cite

Fumed silica is used as a template in the nanocasting approach towards nanoporous silicon carbide, and it can then be applied as a catalyst support. By varying the pyrolysis temperature between 1000 and 1500°C, the structural parameters of the resulting silicon carbide materials DUT-87 (DUT = Dresden University of Technology) can be controlled. A specific surface of 328 m2 g-1 is obtained. Furthermore, the oxidation behaviour of such nanoporous SiCs is investigated. The materials are distinguished by an impressive thermal stability at 900°C for at least 12 h, which is allowed by the presence of a passive oxidation even for such highly porous SiCs. Hence, nickel (10 wt%) was supported on the fresh DUT-87 as well as controlled oxidized DUT-87preox samples, and the influence of the different support properties on the characteristics of the catalyst samples which are used in the carbon dioxide reforming of methane was investigated. The SiO2 layer on the SiC for the DUT-87preox samples could prevent the formation of nickel silicide to a large extent at temperatures up to 850°C. This resulted in higher activities during the dry reforming of methane at 800°C and the performance of the siliceous supports was significantly exceeded, emphasizing the beneficial effect of SiC. Effective methane reaction rates of 1.2 mmol g-1 s-1 were obtained for KPK1ox which was based on DUT-87 pyrolysed at 1300°C and oxidative treatment prior to nickel insertion. Furthermore, a stable conversion level was reached over the whole time on stream of 8 h

show abstract

Section: Nickel-containing Catalyst Systemssupporting

confidence: 54%

Nanoporous silicon carbide as nickel support for the carbon dioxide reforming of methane

Hoffmann

Plate

Steinbrück

et al. 2015

Catal. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The results indicated that the xFePt/AC series with the small amount of Fe (0.1-0.5 wt%) could improve both furfural conversion and FA selectivity of the Pt/AC catalysts, especially in water solvent. The superior catalyst performances were attributed to high Pt dispersion and a strong interaction between Pt and the carbon support and/or the formation of a Pt-Fe alloy [26,38]. The role of Fe to enhance the selectivity of carbonyl compound (C=O) reduction has been suggested by Ananthan S.A. et al that Pt-Fe sites favored the di-σCO adsorption, which promoted the activation of the C=O group over the supported Pt-Fe catalysts [39].…”

Section: Catalytic Reaction Studymentioning

confidence: 99%

Liquid-Phase Selective Hydrogenation of Furfural to Furfuryl Alcohol over Ferromagnetic Element (Fe, Co, Ni, Nd)-Promoted Pt Catalysts Supported on Activated Carbon

et al. 2022

View full text Add to dashboard Cite

Ferromagnetic element (x = Fe, Co, Ni, and Nd)-promoted Pt/AC catalysts were prepared by co-impregnation method or physical mixing and tested in the liquid-phase hydrogenation of furfural to furfuryl alcohol (FA) under mild conditions (50 °C and 20 bar H2) using water and methanol as the solvent. Among the various catalysts studied, the 0.15FePt/AC exhibited complete conversion of furfural with an FA selectivity of 74% after only 1 h of reaction time in water. The promotional effect of the bimetallic catalysts became less pronounced when methanol was used as the solvent and a 2-furaldehyde dimethyl acetal solvent product was formed. The superior catalyst performances were correlated with the higher Pt dispersion, the presence of low coordination Pt sites, and the strong Pt–Fe interaction as characterized by X-ray diffraction, H2 temperature-programmed reduction (H2-TPR), N2 physisorption, and infrared spectroscopy of the adsorbed CO (CO-IR). However, to simply use a magnet for catalyst separation, 0.5 wt% Fe was the minimum Fe loading on the Pt/AC. The 0.5FePt/AC still exhibited good magnetic properties after the third consecutive runs.

show abstract

“…The catalytic reactivity depends on size and shape of nanoparticles and therefore synthesis of controlled shapes and size of colloidal platinum particles could be critical for these applications. Platinum (Pt)–iron (Fe) nanocomposites show high activity as catalyst in organic synthesis 12. The smaller the metal particles are at the same metal loading, the larger are the fraction areas of metal atoms that are accessible to reactant molecules and available for catalysis.…”

Section: Introductionmentioning

confidence: 99%

Preparation and catalytic use of platinum in magnetic core/shell nanocomposites

Darwish¹,

Kunz²,

Peuker³

2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

Platinum (Pt) nanoparticles show high activity as catalysts in various chemical reactions. The control of the morphology of Pt nanostructures can provide an opportunity to improve their catalytic properties. The preparation of Pt-loaded iron-oxide polyvinylbenzyl chloride nanocomposites was done in several stages: first by the formation of the core consisting of magnetite nanoparticles and second by the polymerization of vinylbenzyl chloride in the presence of the magnetic core particles. The third step is the amination of the chlorine group with ammonia, which leads to an ion exchange resin. Then, the Pt precursor (H 2 PtCl 6 ) is attached by ion exchange. Finally, the Pt ions are reduced to Pt metal with NaBH 4 . The obtained material can be dispersed easily and be used as a catalyst which can be separated after the reaction by magnetic fields. Characterization of the resulting metallic nanocomposites is evaluated by atomic absorption spectroscopy, thermal gravimetric analysis, transmission electron microscopy, infrared spectroscopy, and gas chromatography. The activity of Pt at magnetic core/shell nanocomposites was measured for the reduction reaction of cinnamaldehyde to cinnamyl alcohol.

show abstract

SELECTIVE HYDROGENATION OF CINNAMALDEHYDE WITH Pt AND Pt-Fe CATALYSTS: EFFECTS OF THE SUPPORT

Cited by 6 publications

References 6 publications

Nanoporous silicon carbide as nickel support for the carbon dioxide reforming of methane

Nanoporous silicon carbide as nickel support for the carbon dioxide reforming of methane

Liquid-Phase Selective Hydrogenation of Furfural to Furfuryl Alcohol over Ferromagnetic Element (Fe, Co, Ni, Nd)-Promoted Pt Catalysts Supported on Activated Carbon

Preparation and catalytic use of platinum in magnetic core/shell nanocomposites

Contact Info

Product

Resources

About