scholarly journals Preparation of Highly Dispersed Pd-Supported Catalysts for Hydrogenation Processes by Microemulsion Method

2018 ◽  
Author(s):  
Jan Patera ◽  
Iva Paterová ◽  
Jiří Krupka ◽  
Květa Jirátová
Keyword(s):  
Supported Catalysts ◽  
Microemulsion Method ◽  
Highly Dispersed

XRD characterization of highly dispersed metal catalysts on carbon support

1993 ◽  
Vol 8 (8) ◽  
pp. 1829-1835 ◽  
Author(s):  
Paolo Scardi ◽  
Pier Luigi Antonucci
Keyword(s):  
Particle Size ◽  
Supported Catalysts ◽  
Profile Analysis ◽  
Rietveld Method ◽  
Carbon Support ◽  
Lattice Parameter ◽  
Microstructural Parameters ◽  
Transmission Electron ◽  
Supported Pt Catalysts ◽  
Highly Dispersed

Carbon-supported Pt catalysts were prepared from H2PtCl6 or K2PtCl6 aqueous solutions. Particle size and structure after several thermal activation treatments were studied by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and Cyclic Voltammetry (CV), and the results of the three techniques were compared. As the catalysts were highly dispersed on an amorphous support, a conventional XRD profile analysis for crystallite size determination could not be performed properly, because of the strong overlapping between the broad Pt peaks superposed to the halos of the amorphous phase. Thus, a new procedure of whole XRD pattern fitting, based on the Rietveld method, was used to have reliable data of Pt particle size (surface area) and lattice parameter. All structural and microstructural parameters were refined within the same procedure, also considering the transparency of the carbon supported catalysts and minimizing the effect of the amorphous background. The method can also take into account the presence of bimodal particle size distributions, which is difficult to study by CV or TEM.

Highly dispersed platinum supported catalysts – Effect of properties on the electrocatalytic activity

2019 ◽  
Vol 259 ◽  
pp. 118050 ◽  
Author(s):  
Eirini Zagoraiou ◽  
Maria K. Daletou ◽  
Labrini Sygellou ◽  
Stella Ballomenou ◽  
Stylianos G. Neophytides
Keyword(s):  
Electrocatalytic Activity ◽  
Supported Catalysts ◽  
Highly Dispersed

Highly dispersed platinum on carbon aerogels as supported catalysts for PEM fuel cell-electrodes: comparison of two different synthesis paths

2004 ◽  
Vol 350 ◽  
pp. 88-96 ◽  
Author(s):  
Julien Marie ◽  
Sandrine Berthon-Fabry ◽  
Patrick Achard ◽  
Marian Chatenet ◽  
Aurélie Pradourat ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Supported Catalysts ◽  
Pem Fuel Cell ◽  
Carbon Aerogels ◽  
Fuel Cell Electrodes ◽  
Highly Dispersed

Properties of highly dispersed supported catalysts in hydrogenation reactions

1984 ◽  
Vol 25 (3-4) ◽  
pp. 201-205
Author(s):  
N. A. Zakarina ◽  
G. D. Zakumbaeva ◽  
V. P. Kuidina
Keyword(s):  
Supported Catalysts ◽  
Highly Dispersed ◽  
Hydrogenation Reactions

Highly dispersed clay–polyolefin nanocomposites free of compatibilizers, via the in situ polymerization of α-olefins by clay-supported catalysts

2008 ◽  
pp. 4186 ◽  
Author(s):  
Susannah L. Scott ◽  
Brian C. Peoples ◽  
Cathleen Yung ◽  
René S. Rojas ◽  
Vikram Khanna ◽  
...  
Keyword(s):  
In Situ Polymerization ◽  
Supported Catalysts ◽  
Highly Dispersed

Epoxidation of Styrene with Molecular Oxygen on Co3O4/SiO2 Catalyst

2011 ◽  
Vol 396-398 ◽  
pp. 1699-1702 ◽  
Author(s):  
Yang Yi Shen ◽  
Ming Qiao Zhu ◽  
Jin Pei Du ◽  
Yang Yang Yang ◽  
Yue Tang
Keyword(s):  
Molecular Oxygen ◽  
Active Site ◽  
Supported Catalysts ◽  
Styrene Oxide ◽  
Precipitation Method ◽  
Styrene Epoxidation ◽  
Catalytic Epoxidation ◽  
Highly Dispersed ◽  
Good Catalytic Activity ◽  
Xrd And Tem

A series of supported catalysts Co3O4/SiO2 were prepared by deposition precipitation method. ICP-AES, XRD and TEM data revealed that the Co3O4 active site was highly dispersed on the surface of SiO2. The catalysts were evaluated for selective epoxidation of styrene with molecular oxygen. The results showed that the catalysts were of good catalytic activity for styrene epoxidation and many factors had an evident effect on the catalytic epoxidation activity. The best catalyst was 3% Co3O4/SiO2 on which 96.3% conversion of styrene and 52.7% selectivity of styrene oxide were obtained under the flow rate of O2 20mL/min, 100°C, 10h with solvent.

On the Performance of Metal Supported Catalysts Prepared by Microemulsion: Sol Gel and Precipitation of the Support Precursor

2005 ◽  
Vol 3 (1) ◽  
Author(s):  
Gustavo Pérez ◽  
J. Luis Suaste ◽  
César Barrales ◽  
J. Antonio De los Reyes ◽  
Juan Pérez-Sea ◽  
...  
Keyword(s):  
Supported Catalysts ◽  
Sol Gel ◽  
Synthesis Method ◽  
Active Phase ◽  
Catalytic Performance ◽  
Ammonium Bromide ◽  
Microemulsion Method ◽  
Structure Sensitive ◽  
Cetyltrimethyl Ammonium

Ni/SiO2, NiMo/Al2O3 and CoMo/Al2O3 were prepared by microemulsion method. Precipitation and sol-gel of the support precursor allowed the synthesis of catalysts with differences in textural, structural and catalytic properties. The main difference between the precipitation and sol-gel microemulsion routes is the role of surfactant (Cetyltrimethyl Ammonium Bromide) in each synthesis method. The aggregation mechanism of support is modified by the synthesis route. There are differences in the catalytic performance of Ni/SiO2 microemulsion catalysts by the precipitation or sol-gel of support precursor. The hydrogenation of benzene, a low structure-sensitive reaction, showed that the precipitation 9%Ni/SiO2 microemulsion catalyst is more active than the sol-gel 9%Ni/SiO2 microemulsion catalyst. On other hand, these catalysts showed opposite result in the hydrogenation of C=C double bond of crotonaldehyde molecule. These results are indicative of the effects of nanostructured support and nanostructured active-phase in the hydrogenation activity. NiMo/Al2O3 and CoMo/Al2O3 catalysts prepared by sol-gel-microemulsion method were used in the hydrodesulphurization (HDS) of dibenzothiophene and 4,6-dimethyldibenzothiophene. The HDS activity was improved as a function of metal content and it motivates the study of NiMo and CoMo microemulsion catalysts with higher contents of metals to enhance the HDS of 4,6-dimethyldibenzothiophene.

scholarly journals Preparation of highly dispersed Ru-Sn bimetallic supported catalysts from the single source precursors Cp(PPh3)2Ru-SnX3 (X = Cl or Br)

2003 ◽  
Vol 6 (2) ◽  
pp. 137-144 ◽  
Author(s):  
Ana Cláudia Bernardes Silva ◽  
Ana Paula Guimarães de Sousa ◽  
José Domingos Ardisson ◽  
Helmuth Guido Luna Siebald ◽  
Edmilson Moura ◽  
...  
Keyword(s):  
Supported Catalysts ◽  
Single Source ◽  
Single Source Precursors ◽  
Highly Dispersed
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