Effect of transition metals (Cr, Mn, Fe, Co, Ni, Cu and Zn) on the hydrogenation properties of benzene over Ru-based catalyst

2013 ◽  
Vol 464-465 ◽  
pp. 1-9 ◽  
Author(s):  
Hai-Jie Sun ◽  
Ya-Jie Pan ◽  
Hou-Bing Jiang ◽  
Shuai-Hui Li ◽  
Yuan-Xin Zhang ◽  
...  
Keyword(s):  
Transition Metals ◽  
Cu And Zn

Designing of Inorganic Al12N12 Nanocluster with Fe, Co, Ni, Cu and Zn Metals for Efficient Hydrogen Storage Materials

2021 ◽  
Vol 20 (04) ◽  
pp. 359-375
Author(s):  
Muhammad Yasir Mehboob ◽  
Fakhar Hussain ◽  
Riaz Hussain ◽  
Shaukat Ali ◽  
Zobia Irshad ◽  
...  
Keyword(s):  
Transition Metals ◽  
Hydrogen Storage ◽  
Density Functional ◽  
Hydrogen Adsorption ◽  
Chemical Hardness ◽  
Hydrogen Storage Materials ◽  
Late Transition Metals ◽  
Storage Materials ◽  
Late Transition ◽  
Cu And Zn

Hydrogen is considered as one of the attractive environmentally friendly materials with zero carbon emission. Hydrogen storage is still challenging for its use in various energy applications. That’s why hydrogen gained more and more attention to become a major fuel of today’s energy consumption. Therefore, nowadays, hydrogen storage materials are under extensive research. Herein, efforts are being devoted to design efficient systems which could be used for future hydrogen storage purposes. To this end, we have employed density functional theory (DFT) to optimize the geometries of the designed inorganic Al[Formula: see text]N[Formula: see text] nanoclusters with transition metals (Fe, Co, Ni, Cu and Zn). Various positions of metal encapsulated Al[Formula: see text]N[Formula: see text] are examined for efficient hydrogen adsorption. After adsorption of H2 on late transition metals encapsulated Al[Formula: see text]N[Formula: see text] nanocluster, different geometric parameters like frontier molecular orbitals, adsorption energies and nature bonding orbitals have been performed for exploring the potential of metal encapsulated for hydrogen adsorption. Moreover, molecular electrostatic potential (MEP) analysis was also performed in order to explore the different charge separation upon H2 adsorption on metals encapsulated Al[Formula: see text]N[Formula: see text] nanoclusters. Also, global indices of reactivity like ionization potential, electron affinity, electrophilic index, chemical softness and chemical hardness were also examined by using DFT. The adsorption energy results suggested encapsulation of late transition metals in Al[Formula: see text]N[Formula: see text] nanocage efficiently enhancing the adsorption capability of Al[Formula: see text]N[Formula: see text] for hydrogen adsorption. Results of all analysis suggested that our designed systems are efficient candidates for hydrogen adsorption. Thus, we recommended a novel kind of systems for hydrogen storage materials.

Resolving surface chemical states in XPS analysis of first row transition metals, oxides and hydroxides: Sc, Ti, V, Cu and Zn

2010 ◽  
Vol 257 (3) ◽  
pp. 887-898 ◽  
Author(s):  
Mark C. Biesinger ◽  
Leo W.M. Lau ◽  
Andrea R. Gerson ◽  
Roger St.C. Smart
Keyword(s):  
Transition Metals ◽  
Xps Analysis ◽  
Surface Chemical ◽  
Chemical States ◽  
Cu And Zn

Thermoelectric properties of transition metals-doped Ca3Co3.8M0.2O9+δ (M = Co, Cr, Fe, Ni, Cu and Zn)

2011 ◽  
Vol 23 (5) ◽  
pp. 1050-1056 ◽  
Author(s):  
S. Pinitsoontorn ◽  
N. Lerssongkram ◽  
N. Keawprak ◽  
V. Amornkitbamrung
Keyword(s):  
Transition Metals ◽  
Thermoelectric Properties ◽  
Cu And Zn

scholarly journals Synthesis and Structural Characterisation of an Isomorphous Series of Bis(imidazolin-2-imine) Metal Dichlorides Containing the First Row Transition Metals Mn, Fe, Co, Ni, Cu and Zn

2010 ◽  
Vol 636 (13-14) ◽  
pp. 2303-2308 ◽  
Author(s):  
Thomas Glöge ◽  
Dejan Petrovic ◽  
Cristian G. Hrib ◽  
Constantin Daniliuc ◽  
Eberhardt Herdtweck ◽  
...  
Keyword(s):  
Transition Metals ◽  
Structural Characterisation ◽  
Cu And Zn

Molten potassium pyrosulfate: Reactions of metals

1982 ◽  
Vol 35 (2) ◽  
pp. 437 ◽  
Author(s):  
AN Ford ◽  
BJ Meehan ◽  
SA Tariq
Keyword(s):  
Sulfur Dioxide ◽  
Transition Metals ◽  
Reaction Products ◽  
Cu And Zn

The reactions of the fist row transition metals and zinc with molten potassium pyrosulfate were investigated. It was found that Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn were oxidized to TiIV, VIV, CrIII, MnII, FeIII, CoII, NiII, CuII and Zn11 respectively and the reaction products of the pyrosulfate melt consisted of sulfate and sulfur dioxide. The stoichiometries of these reactions have been established.

scholarly journals Concentration of selected transition metals in layer hens non-infested and infested with Dermanyssus gallinae

2012 ◽  
Vol 81 (3) ◽  
pp. 307-311 ◽  
Author(s):  
Anna Spodniewska ◽  
Dariusz Barski ◽  
Rajmund Sokół
Keyword(s):  
Transition Metals ◽  
Atomic Absorption ◽  
Considerable Increase ◽  
Laying Hens ◽  
Atomic Absorption Spectrophotometry ◽  
Dermanyssus Gallinae ◽  
Absorption Spectrophotometry ◽  
The Mean ◽  
Cu And Zn

The aim of this study was to determine the concentration of selected transition metals, i.e. iron (Fe), copper (Cu) and zinc (Zn) in the livers of laying hens free from and infested with the red mite (Dermanyssus gallinae) and to explain the effects of the invasion of this parasite on the content of those elements. The study was carried out on 24 Hy-Line Brown hens bred in battery cages. The birds were divided into two groups, free from and infested with D. gallinae. Concentration of analysed metals was determined using atomic absorption spectrophotometry. Based on this experiment, it was proved that a long-term (52 weeks) exposure of hens to D. gallinae resulted in a significant (P < 0.05) decrease of Fe, Cu and Zn in the liver. The mean content of analysed metals in the group infested with the parasite amounted to 31.42 mg Fe/kg, 2.71 mg Cu/kg and 22.64 mg/kg, whereas in the non-infested group it was 38.51 mg Fe/kg, 3.12 mg Cu/kg and 26.53 mg Zn/kg. No significant (P < 0.05) alterations in haematological indicators were found between the examined groups of birds. The results may suggest that 3 weeks of recovery in hens are sufficient to bring about a considerable increase in concentration of analysed transition metals in the liver.

ChemInform Abstract: THERMAL DECOMPOSITION OF THE BIGUANIDE COMPLEXES OF THE 3D-TRANSITION METALS (V, CR, MN, CO, NI, CU AND ZN)

1974 ◽  
Vol 5 (20) ◽  
pp. no-no
Author(s):  
P. V. BABYKUTTY ◽  
P. INDRASENAN ◽  
R. ANANTARAMAN ◽  
C. G. RAMACHANDRAN NAIR
Keyword(s):  
Thermal Decomposition ◽  
Transition Metals ◽  
Cu And Zn

scholarly journals Potential oxygen-carrying complexes by design

Quimica Hoy ◽  
2012 ◽  
Vol 2 (4) ◽  
pp. 4
Author(s):  
Víctor M. Rosas García ◽  
Perla Elizondo Martínez ◽  
Nancy Pérez Rodríguez ◽  
Blanca Nájera Martínez
Keyword(s):  
Transition Metals ◽  
Gas Phase ◽  
Oxygen Transport ◽  
Model Compound ◽  
Human Life ◽  
Active Form ◽  
Living Systems ◽  
Oxygen Carriers ◽  
Potential Oxygen ◽  
Cu And Zn

There are twenty four elements known to be necessary for human life, seven of which are transition metals. These seven elements; V, Cr, Mn, Fe, Co, Cu, and Zn have an important role in living systems due to their ability to form complexes with diverse donor groups present in biological systems. [Co(salen)] has been previously studied as a model compound for oxygen transport. In this work other metallic complexes, Ni(II), Zn(II), Cu(II) and Fe(II) with N,N'-bis(salicylaldehyde)ethylenediamine  (salen-H2) were synthesized. The active form of each complex was obtained by reaction with dimethylsulfoxide. The ability of these metallic complexes to act as O2 carriers was determined. From the results, the complexes of the Co(II), Fe(II) and Cu(II) with salen are able to transport oxygen with an ordering of Co(II) > Fe(II) > Cu(II) regarding the capacity to carry O2. We used the PM7 semiempirical hamiltonian to study the complexes of salen with Co(II), Cu(II), Fe(II) and Ni(II) and their potential as oxygen carriers. We performed full geometry optimizations in the gas phase for each complex, its active form with DMSO as ligand, and with dioxygen complexed with the active form. We discuss energetic features associated with the binding of dioxygen to the complexes.

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