Platinum Supported Catalysts Prepared from Metal Carbonyl Clusters for Hydrocarbons Conversion

1998 ◽  
Vol 549 ◽  
Author(s):  
P.E. Kolosov ◽  
N.B. Shitova ◽  
M.D. Smolikov ◽  
V.A. Drozdov ◽  
E.M. Moroz
Keyword(s):  
Supported Catalysts ◽  
Metal Carbonyl ◽  
Distribution Functions ◽  
Carbonyl Clusters ◽  
Metal Support Interaction ◽  
Cyclohexane Dehydrogenation ◽  
Metal Carbonyl Clusters ◽  
Metal Support ◽  
Dehydrogenation Reactions ◽  
Pt Carbonyl Clusters

AbstractThe investigation of surface Pt/alumina, Pt/ carbon (Sibunit) and Pt/SiO2 species prepared by anchoring of Pt carbonyl clusters of various nuclearity as precursors for high dispersive and thermostable platinum supported catalysts for hydrocarbons conversion, using RDF (radial distribution functions) and chemisorption methods, has shown strong metal-support interaction with formation of Pt/alumina phase with highly dispersed (practically monoatomic) and homogeneously distributed Pt atoms onto alumina surface. The catalytic properties were studied in methane oxidation and cyclohexane dehydrogenation reactions.

Salts of Anionic Metal Carbonyl Clusters with Cryptand[2.2.2](Na+ ), DB-18-crown-6(Na+ ), and Paramagnetic Cp*2 Cr+ Cations Obtained by Reduction

2019 ◽  
Vol 645 (4) ◽  
pp. 472-483 ◽  
Author(s):  
Dmitri V. Konarev ◽  
Alexey V. Kuzmin ◽  
Roman S. Galkin ◽  
Salavat S. Khasanov ◽  
Rinat F. Kurbanov ◽  
...  
Keyword(s):  
Metal Carbonyl ◽  
Carbonyl Clusters ◽  
Metal Carbonyl Clusters

Co-processing of hydrodeoxygenation and hydrodesulfurization of phenol and dibenzothiophene with NiMo/Al2O3–ZrO2 and NiMo/TiO2–ZrO2 catalysts

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jesús Andrés Tavizón Pozos ◽  
Gerardo Chávez Esquivel ◽  
Ignacio Cervantes Arista ◽  
José Antonio de los Reyes Heredia ◽  
Víctor Alejandro Suárez Toriello
Keyword(s):  
Active Sites ◽  
Reaction Rate ◽  
Supported Catalysts ◽  
Initial Reaction Rate ◽  
Initial Reaction ◽  
Competition Effect ◽  
Support Interaction ◽  
Highly Active ◽  
Metal Support Interaction ◽  
Metal Support

Abstract The influence of Al2O3–ZrO2 and TiO2–ZrO2 supports on NiMo-supported catalysts at a different sulfur concentration in a model hydrodeoxygenation (HDO)-hydrodesulfurization (HDS) co-processing reaction has been studied in this work. A competition effect between phenol and dibenzothiophene (DBT) for active sites was evidenced. The competence for the active sites between phenol and DBT was measured by comparison of the initial reaction rate and selectivity at two sulfur concentrations (200 and 500 ppm S). NiMo/TiO2–ZrO2 was almost four-fold more active in phenol HDO co-processed with DBT than NiMo/Al2O3–ZrO2 catalyst. Consequently, more labile active sites are present on NiMo/TiO2–ZrO2 than in NiMo/Al2O3–ZrO2 confirmed by the decrease in co-processing competition for the active sites between phenol and DBT. DBT molecules react at hydrogenolysis sites (edge and rim) preferentially so that phenol reacts at hydrogenation sites (edge and edge). However, the hydrogenated capacity would be lost when the sulfur content was increased. In general, both catalysts showed similar functionalities but different degrees of competition according to the highly active NiMoS phase availability. TiO2–ZrO2 as the support provided weaker metal-support interaction than Al2O3–ZrO2, generating a larger fraction of easily reducible octahedrally coordinated Mo- and Ni-oxide species, causing that NiMo/TiO2–ZrO2 generated precursors of MoS2 crystallites with a longer length and stacking but with a higher degree of Ni-promotion than NiMo/Al2O3–ZrO2 catalyst.

scholarly journals The Categorization and Structural Prediction of Transition Metal Carbonyl Clusters Using 14n Series Numerical Matrix

2016 ◽  
Vol 8 (1) ◽  
pp. 109
Author(s):  
Enos Masheija Rwantale Kiremire
Keyword(s):  
Transition Metal ◽  
Valence Electron ◽  
Metal Carbonyl ◽  
Electron Content ◽  
Constant Number ◽  
Carbonyl Clusters ◽  
Structural Prediction ◽  
Metal Carbonyl Clusters ◽  
The Matrix ◽  
Special Case

<p>A matrix table of valence electron content of carbonyl clusters has been created using the 14n-based series. The numbers so generated form an array of series which conform precisely with valence electron contents of carbonyl clusters. The renowned 18 electron rule is a special case of 14n+4 series. Similarly, the 16 electron rule is another special case of the 14n+2 series. Categorization of the carbonyl clusters using the matrix table of series has been demonstrated. The table is so organized that clusters numerically represented can easily be compared and analyzed. The numbers that are diagonally arranged from right to left represent capping series. The row from right to left represents a decrease in valence electron content with increase in cluster linkages. The variation of cluster shapes of constant number of skeletal elements especially four or more may be monitored or compared with the variation with the valence electron content.</p>

Synthesis, Characterization and Electrochemistry of Some Metal Carbonyl Clusters Derived from Ferrocenylethynylpyridine

2015 ◽  
Vol 26 (2) ◽  
pp. 461-471 ◽  
Author(s):  
Wai-Yeung Wong ◽  
Qingchen Dong ◽  
Suk-Ha Cheung ◽  
Pui-Ling Lau ◽  
Nian-Yong Zhu ◽  
...  
Keyword(s):  
Metal Carbonyl ◽  
Carbonyl Clusters ◽  
Metal Carbonyl Clusters
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