Selective hydrogenation of cinnamaldehyde over Pt and Pd supported on multiwalled carbon nanotubes in a CO2 - expanded alcoholic medium / Bao-Hui Zhao in Industrial & engineering chemistry research, Vol. 51 N° 34 (Août 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11112-11121 Titre : Selective hydrogenation of cinnamaldehyde over Pt and Pd supported on multiwalled carbon nanotubes in a CO2 - expanded alcoholic medium Type de document : texte imprimé Auteurs : Bao-Hui Zhao, Auteur ; Jian-Gang Chen, Auteur ; Xuan Liu, Auteur Année de publication : 2012 Article en page(s) : pp. 11112-11121 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Carbon dioxide Hydrogenation Résumé : Pt/MWCNT and Pd/MWCNT nanocatalysts were prepared via a liquid reduction method. The selective hydrogenation of cinnamaldehyde (CAL) was investigated over 5.0 wt.% Pt/MWCNT and 5.0 wt% Pd/MWCNT catalysts in a CO2-enpanded alcoholic medium at different reaction conditions. The hydrogenation selectivities over these two catalyst types were shown to be entirely different. It was found that the Pt/MWCNT catalysts are highly selective for C=O bonds, giving the unsaturated alcohol a selectivity for cinnamyl alcohol (COL) of 97.3% and a conversion rate for cinnamaldehyde of 99.3%. Conversely, the Pd/MWCNT catalyst is highly selective for C=C bonds, producing a saturated aldehyde with a selectivity for hydrocinnamaldehyde (HCAL) of 91.3% and a conversion rate for cinnamaldehyde of 98.6%. The small diameter of the Pt or Pd granules over the multiwalled carbon nanotubes (MWCNTs) leads to a high catalyst activity, and an increase of CO2 pressure results in a better hydrogenation performance for C=O bonds than that for C=C bonds. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26299436 [article] Selective hydrogenation of cinnamaldehyde over Pt and Pd supported on multiwalled carbon nanotubes in a CO2 - expanded alcoholic medium [texte imprimé] / Bao-Hui Zhao, Auteur ; Jian-Gang Chen, Auteur ; Xuan Liu, Auteur . - 2012 . - pp. 11112-11121. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11112-11121 Mots-clés : Carbon dioxide Hydrogenation Résumé : Pt/MWCNT and Pd/MWCNT nanocatalysts were prepared via a liquid reduction method. The selective hydrogenation of cinnamaldehyde (CAL) was investigated over 5.0 wt.% Pt/MWCNT and 5.0 wt% Pd/MWCNT catalysts in a CO2-enpanded alcoholic medium at different reaction conditions. The hydrogenation selectivities over these two catalyst types were shown to be entirely different. It was found that the Pt/MWCNT catalysts are highly selective for C=O bonds, giving the unsaturated alcohol a selectivity for cinnamyl alcohol (COL) of 97.3% and a conversion rate for cinnamaldehyde of 99.3%. Conversely, the Pd/MWCNT catalyst is highly selective for C=C bonds, producing a saturated aldehyde with a selectivity for hydrocinnamaldehyde (HCAL) of 91.3% and a conversion rate for cinnamaldehyde of 98.6%. The small diameter of the Pt or Pd granules over the multiwalled carbon nanotubes (MWCNTs) leads to a high catalyst activity, and an increase of CO2 pressure results in a better hydrogenation performance for C=O bonds than that for C=C bonds. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26299436

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