scholarly journals Ordered intermetallic Pt–Cu nanoparticles for the catalytic CO oxidation reaction

RSC Advances ◽  
2016 ◽  
Vol 6 (88) ◽  
pp. 85634-85642 ◽  
Author(s):  
Govindachetty Saravanan ◽  
Rohini Khobragade ◽  
Laxmi Chand Nagar ◽  
Nitin Labhsetwar
Keyword(s):  
Particle Size ◽  
Co Oxidation ◽  
Oxidation Reaction ◽  
Average Particle Size ◽  
Pt Nanoparticles ◽  
Average Particle ◽  
Cu Nanoparticles ◽  
Catalytic Co Oxidation ◽  
Co Oxidation Reaction ◽  
Ordered Intermetallic

Intermetallic platinum (Pt) nanoparticles using the abundantly available element copper (Pt3Cu, PtCu, PtCu3) with an average particle size of 4–5 nm on a γ-Al2O3 support were prepared to reduce the consumption of Pt for the removal of CO from gases.

A near-ambient-pressure XPS study on catalytic CO oxidation reaction over a Ru(101¯0) surface

2014 ◽  
Vol 621 ◽  
pp. 128-132 ◽  
Author(s):  
Ryo Toyoshima ◽  
Masahiro Shimura ◽  
Masaaki Yoshida ◽  
Yuji Monya ◽  
Kazuma Suzuki ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Oxidation Reaction ◽  
Ambient Pressure ◽  
Catalytic Co Oxidation ◽  
Co Oxidation Reaction ◽  
Ambient Pressure Xps ◽  
Xps Study ◽  
Near Ambient Pressure Xps

Modulation of the catalytic activity of Pt nanoparticles through charge-transfer interactions with metal–organic frameworks

2017 ◽  
Vol 53 (50) ◽  
pp. 6720-6723 ◽  
Author(s):  
Shotaro Yoshimaru ◽  
Masaaki Sadakiyo ◽  
Aleksandar Staykov ◽  
Kenichi Kato ◽  
Miho Yamauchi
Keyword(s):  
Catalytic Activity ◽  
Charge Transfer ◽  
Co Oxidation ◽  
Oxidation Reaction ◽  
Metal Organic Frameworks ◽  
Pt Nanoparticles ◽  
Charge Transfer Interaction ◽  
Co Oxidation Reaction ◽  
Metal Organic ◽  
A Charge

A charge transfer interaction between Pt nanoparticles and MOFs modulated the catalytic activity of Pt for a CO oxidation reaction.

Revisiting the Au Particle Size Effect on TiO2-Coated Au/TiO2 Catalysts in CO Oxidation Reaction

2016 ◽  
Vol 120 (17) ◽  
pp. 9174-9183 ◽  
Author(s):  
Qi Yao ◽  
Chunlei Wang ◽  
Hengwei Wang ◽  
Huan Yan ◽  
Junling Lu
Keyword(s):  
Particle Size ◽  
Size Effect ◽  
Co Oxidation ◽  
Oxidation Reaction ◽  
Particle Size Effect ◽  
Co Oxidation Reaction ◽  
Au Particle Size

Magnetic Pt single and double core-shell structures for the catalytic selective hydrogenation of cinnmaladehyde

2020 ◽  
Vol 92 (3) ◽  
pp. 413-427 ◽  
Author(s):  
Robinson B. Dinamarca ◽  
Rodrigo Espinoza-González ◽  
Cristian H. Campos ◽  
Gina Pecchi
Keyword(s):  
Particle Size ◽  
Average Particle Size ◽  
Pt Nanoparticles ◽  
Magnetic Core ◽  
Shell Structures ◽  
Pt Catalyst ◽  
Core Shell ◽  
Average Particle ◽  
Cinnamyl Alcohol ◽  
Metal Support Interaction

AbstractThis study reports the catalytic preparation, characterization, and evaluation of nanoscale core-shell structures with a γ-Fe2O3 core covered by a SiO2 monoshell or by a SiO2@TiO2 multishell as a support for Pt nanoparticles (NPs) to synthesize active and operationally stable catalysts for selective liquid-phase cinnamaldehyde hydrogenation. The structures were designed with a magnetic core so they could be easily recovered from the catalytic bed by simple magnetization and with a SiO2 monoshell or a SiO2@TiO2 multishell to protect the magnetic core. At the same time, this study details the effect of the shell on the catalytic performance. Moreover, the effect of particle size on the selective production of cinnamyl alcohol was studied by preparing two families of catalysts with metal loadings of 1 wt% and 5 wt% Pt with respect to the core-shell. The particle size effect enabled the Fe2O3@SiO2-5%Pt system, with an average particle size of 5.6 nm, to reach 100 % conversion of cinnamaldehyde at 300 min of reaction, producing cinnamyl alcohol with 90 % selectivity; this result differed greatly from that of the Fe2O3@SiO2-1%Pt (dPt = 3.5 nm) system, which reached a maximum conversion at 600 min with 49 % selectivity for the product of interest. However, the Fe2O3@SiO2@TiO2-x%Pt systems showed lower levels of conversion and selectivity compared to those of the Fe2O3@SiO2-x%Pt catalysts, which is attributed to the fact that average metal particle sizes below 5.0 nm were obtained in both cases. After reduction in H2 at 773 K, the Fe2O3@SiO2@TiO2-1%Pt catalyst showed deactivation, reaching 10 % conversion at 600 min of reaction and 60 % selectivity for the product of interest. However, the reduced Fe2O3@SiO2@TiO2-5%Pt system showed 98 % conversion with 95 % selectivity for cinnamyl alcohol at 24 h of operation; the increase in selectivity is attributed to the combined effects of the increase in average particle size (~7.5 nm) and the presence of strong metal-support interaction – SMSI – effects after reduction. Finally, the most selective systems were tested for operational stability, where the Fe2O3@SiO2@-5%Pt catalyst could be reused in three consecutive operating cycles while maintaining its activity and selectivity for cinnamyl alcohol – unlike the Fe2O3@SiO2@TiO2-5%Pt reduced system, which was deactivated after the third reaction cycle due to active phase leaching.

Morphology and Particle Size of Di(ethylene glycol) Mediated Metallic Copper Nanoparticles

2008 ◽  
Vol 8 (7) ◽  
pp. 3516-3525 ◽  
Author(s):  
Alojz Anžlovar ◽  
Zorica Crnjak Orel ◽  
Majda Žigon
Keyword(s):  
Particle Size ◽  
Ethylene Glycol ◽  
Metallic Copper ◽  
Average Particle Size ◽  
Reduction Reaction ◽  
Average Particle ◽  
Cu Nanoparticles ◽  
Starting Compound ◽  
Low Concentrations ◽  
Size And Morphology

Cu nanoparticles were prepared in di(ethylene glycol) by a reduction reaction of Cu (II) acetate precursor to metallic Cu. The size and morphology of the synthesized particles were studied in dependence of the concentration of the starting compound and the temperature conditions of reaction were varied to determine the correlation with the size and morphology of the synthesized particles. The morphology and size of the resulting copper (I) oxide as an intermediate product and metallic Cu particles as a final product are strongly dependent on the concentration of the starting compound, thus indicating differences in the mechanism of the reduction reaction and, consequently, the mechanism of particle formation. At low concentrations (0.01 and 0.1 mol/L), an organo-metallic copper complex intermediate forms crystalline 10–100 nm thick and up to 10 μm long nanowires organized in dendritic spheres with a diameter of 5–50 μm, which further transform into Cu2O. Cu-di(ethylene glycolate) complex has an as yet undescribed crystalline structure. At a high precursor concentration (1 mol/L), the intermediate forms partly amorphous and partly crystalline Cu2O. The reduction of Cu2O to metallic Cu takes place between 190–200 °C. The smallest average particle size (100 nm) and the narrowest particle size distribution was obtained at a Cu (II) acetate concentration of 0.1 mol/L.

Sign in / Sign up

Export Citation Format

Share Document