Influence of the nature of the platinum precursor on the surface properties and catalytic activity of alumina-supported catalysts

Reyes, Patricio; Oportus, Marcelo; Pecchi, Gina; Fréty, R.; Moraweck, B.

doi:10.1007/bf00807753

Cited by 56 publications

(23 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The small peak at 640 K may be attributed to the reduction of PtO to Pt°. A similar behavior was reported by Reyes et al 25 , and Arteaga et al 26 . They prepared Pt/Al 2 O 3 catalysts using H 2 PtCl 6 as precursor.…”

Section: Resultssupporting

confidence: 90%

“…The reduced species (NbO x ,) are probably responsible for the changes in catalytic and chemisorptive properties of the catalysts after reduction at high temperatures 24 . Pt/SiO 2 system present a peak at 500K, it may be related to the PtO x Cl y complex, as described in literature 25 . In this catalyst no showed signals of reduction peaks may be ascribed to the reduction of the support.…”

Section: Resultssupporting

confidence: 56%

See 1 more Smart Citation

LIQUID-PHASE HYDROGENATION OF m-DINITROBENZENE OVER PLATINUM CATALYSTS

Rojas

Borda

Reyes³

et al. 2011

J. Chil. Chem. Soc.

View full text Add to dashboard Cite

The m-dinitrobenzene hydrogenation to m-phenylenediamine in liquid phase was studied with platinum supported on SiO 2 , TiO 2 , Al 2 O 3 and Nb 2 O 5 catalysts. Incipient impregnation method was used to prepare the catalysts with 1wt% of Pt. The effect of the support and the reduction temperature (473 K or 773 K) were analyzed. The materials were characterized by X-ray diffraction (XRD), nitrogen physisorption (77 K), hydrogen chemisorption (298 K), transmission electron microscopy (TEM), temperature programmed reduction (H 2 -TPR) and temperature programmed desorption of ammonia (NH 3 -TPD). The results showed that Pt/ TiO 2 (HT) catalyst had a higher yield (60%) toward m-phenylenediamine and conversion level (98.2%) of m-dinitrobenzene. This behavior can be attributed to the reduction of PtO x crystallites to metallic Pt, small particle size and the strong metal-support interaction due to the migration of TiO x species on the Pt crystallites.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 56%

LIQUID-PHASE HYDROGENATION OF m-DINITROBENZENE OVER PLATINUM CATALYSTS

Rojas

Borda

Reyes³

et al. 2011

J. Chil. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…The presence of acac fragments was also detected in catalysts obtained by the Pt/Al 2 O 3 organometallic route. 17 Comparing TPR proÐles of Fig. 1(A) for ex-Cl samples (bÈe) it can be observed that the Ðrst peak is split and one of its components is shifted towards higher temperatures as the surface acidity increases, as was expected.…”

Section: Resultssupporting

confidence: 51%

Resistance to sulphur poisoning of alumina-supported iridium catalysts in toluene hydrogenation and methylcyclohexane dehydrogenation

Reyes

Fernández

Pecchi

et al. 1998

J. Chem. Technol. Biotechnol.

View full text Add to dashboard Cite

: Alumina-supported iridium catalysts were prepared with highly dispersed iridium particles. The surface acidity of the catalysts was varied by addition of variable amounts of HCl to the impregnating solution and also by using an organometallic precursor. The catalysts were used in toluene hydrogenation and in methylcyclohexane dehydrogenation reactions and the thiotolerance level was measured with a feed containing 10 ppm of thiophene. In both reactions, it was found that the sulphur tolerance increases with increasing acidity of the support.

show abstract

“…In fact, the poor solubility was noted during the synthesis, which tended to downplay other possible variables such as salt effects during drying or calcination on the final properties of the material. Indeed Reyes et al (27) and Baltes et al (28) reported a reasonably high dispersion using acetylacetonate as a precursor in comparison to other precursors when the catalysts were prepared by traditional methods. When H 2 PtCl 6 was used as the metal precursor in this work, Pt particle sizes were quite similar to results obtained using H 2 PtCl 6 by impregnation methods.…”

Section: Calcination At 773 Kmentioning

confidence: 96%