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Carbon nanotubes supported mono - and bimetallic Pt and Ru catalysts for selective hydrogenation of phenylacetylene / Chuang Li in Industrial & engineering chemistry research, Vol. 51 N° 13 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4934–4941 Titre : Carbon nanotubes supported mono - and bimetallic Pt and Ru catalysts for selective hydrogenation of phenylacetylene Type de document : texte imprimé Auteurs : Chuang Li, Auteur ; Zhengfeng Shao, Auteur ; Min Pang, Auteur Année de publication : 2012 Article en page(s) : pp. 4934–4941 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanoparticle  Carbon  nanotubes Résumé : Deposition of Pt, Ru, Pt–Ru alloy, Ru@Pt, and Pt@Ru nanoparticles onto carbon nanotubes (CNTs) has been achieved by chemical reduction of the corresponding RuCl3·3H2O and/or H2PtCl6·6H2O by ethylene glycol in the presence of NaOH. The as-prepared catalysts were characterized by X-ray diffraction, H2-temperature programmed reduction, H2-temperature programmed desorption, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. Liquid-phase selective hydrogenation of phenylacetylene was used as a probe reaction to evaluate their catalytic performances. The as-prepared Pt, Ru, Pt–Ru alloy, Ru@Pt, and Pt@Ru nanoparticles fell in the range of 1.5–3.0 nm in diameter, and were uniformly dispersed on the CNTs. All the bimetallic catalysts displayed the characteristic diffraction peaks due to a Pt face-centered cubic structure, but the 2θ values were shifted to slightly higher ones, indicating the formation of alloy or core–shell structures. XPS analysis revealed that the catalysts contained mostly Pt(0) and Ru(0), with traces of Pt(II), Pt(IV), and Ru(IV). The Pt@Ru/CNTs and Ru@Pt/CNTs core–shell catalysts showed different catalytic properties in selective hydrogenation of phenylacetylene from the Pt–Ru alloy and the mixed monometallic samples with the correspondingly identical composition. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202342a [article] Carbon nanotubes supported mono - and bimetallic Pt and Ru catalysts for selective hydrogenation of phenylacetylene [texte imprimé] / Chuang Li, Auteur ; Zhengfeng Shao, Auteur ; Min Pang, Auteur . - 2012 . - pp. 4934–4941. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4934–4941 Mots-clés : Nanoparticle  Carbon  nanotubes Résumé : Deposition of Pt, Ru, Pt–Ru alloy, Ru@Pt, and Pt@Ru nanoparticles onto carbon nanotubes (CNTs) has been achieved by chemical reduction of the corresponding RuCl3·3H2O and/or H2PtCl6·6H2O by ethylene glycol in the presence of NaOH. The as-prepared catalysts were characterized by X-ray diffraction, H2-temperature programmed reduction, H2-temperature programmed desorption, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. Liquid-phase selective hydrogenation of phenylacetylene was used as a probe reaction to evaluate their catalytic performances. The as-prepared Pt, Ru, Pt–Ru alloy, Ru@Pt, and Pt@Ru nanoparticles fell in the range of 1.5–3.0 nm in diameter, and were uniformly dispersed on the CNTs. All the bimetallic catalysts displayed the characteristic diffraction peaks due to a Pt face-centered cubic structure, but the 2θ values were shifted to slightly higher ones, indicating the formation of alloy or core–shell structures. XPS analysis revealed that the catalysts contained mostly Pt(0) and Ru(0), with traces of Pt(II), Pt(IV), and Ru(IV). The Pt@Ru/CNTs and Ru@Pt/CNTs core–shell catalysts showed different catalytic properties in selective hydrogenation of phenylacetylene from the Pt–Ru alloy and the mixed monometallic samples with the correspondingly identical composition. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202342a

Microwave - assisted preparation of Mo2C/CNTs nanocomposites as efficient electrocatalyst supports for oxygen reduction reaction / Min Pang in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4169-4174 Titre : Microwave - assisted preparation of Mo2C/CNTs nanocomposites as efficient electrocatalyst supports for oxygen reduction reaction Type de document : texte imprimé Auteurs : Min Pang, Auteur ; Chuang Li, Auteur ; Ling Ding, Auteur Année de publication : 2010 Article en page(s) : pp. 4169-4174 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Nanocomposite  Preparation  Microwave Résumé : Nanostructured Mo2C/CNTs composites have been synthesized by using a novel methodology of microwave-assisted thermolytic molecular precursor with Mo(CO)6 as single source precursor. Pt electroeatalysts supported on the Mo2C/CNTs composites were prepared by using the modified ethylene glycol method. The resulting Mo2C/CNTs and Pt―Mo2C/CNTs were characterized by inductively coupled plasma-optical emission spectroscopy, thermogravimetric analysis, X-ray diffraction, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The rotating disk electrode experiments were used to measure electrocatalytic activity for oxygen reduction reaction. The results showed highly dispersed sphere-like Mo2C and Pt particles with 3—6 nm can be prepared upon CNTs by the above-mentioned methods. The formation process of Mo2C includes the following steps: decomposition of Mo(CO)6 precursor to the metallic Mo and CO, CO dismutation reaction, formation of the MoOxCy by the metallic Mo and CO, the MoOxCy carburization to Mo2C, and further carburization of Mo2C to Mo3C2. The Pt―Mo2C/CNTs sample gave higher electrochemical surface area and activity for oxygen reduction reaction with a more positive onset potential in acid solution than those of Pt/CNTs under the same condition, which was attributed to the synergistic effect among Pt, Mo2C, and CNTs. The findings indicate that Mo2C is an inexpensive and promising alternative to precious metal and worthy of further exploring for other applications in catalysis. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22732908 [article] Microwave - assisted preparation of Mo2C/CNTs nanocomposites as efficient electrocatalyst supports for oxygen reduction reaction [texte imprimé] / Min Pang, Auteur ; Chuang Li, Auteur ; Ling Ding, Auteur . - 2010 . - pp. 4169-4174. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4169-4174 Mots-clés : Nanocomposite  Preparation  Microwave Résumé : Nanostructured Mo2C/CNTs composites have been synthesized by using a novel methodology of microwave-assisted thermolytic molecular precursor with Mo(CO)6 as single source precursor. Pt electroeatalysts supported on the Mo2C/CNTs composites were prepared by using the modified ethylene glycol method. The resulting Mo2C/CNTs and Pt―Mo2C/CNTs were characterized by inductively coupled plasma-optical emission spectroscopy, thermogravimetric analysis, X-ray diffraction, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The rotating disk electrode experiments were used to measure electrocatalytic activity for oxygen reduction reaction. The results showed highly dispersed sphere-like Mo2C and Pt particles with 3—6 nm can be prepared upon CNTs by the above-mentioned methods. The formation process of Mo2C includes the following steps: decomposition of Mo(CO)6 precursor to the metallic Mo and CO, CO dismutation reaction, formation of the MoOxCy by the metallic Mo and CO, the MoOxCy carburization to Mo2C, and further carburization of Mo2C to Mo3C2. The Pt―Mo2C/CNTs sample gave higher electrochemical surface area and activity for oxygen reduction reaction with a more positive onset potential in acid solution than those of Pt/CNTs under the same condition, which was attributed to the synergistic effect among Pt, Mo2C, and CNTs. The findings indicate that Mo2C is an inexpensive and promising alternative to precious metal and worthy of further exploring for other applications in catalysis. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22732908