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Related Concept Videos

Noble Gases02:54

Noble Gases

22.8K

The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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Alkali Metals03:06

Alkali Metals

24.8K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

24.3K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.9K

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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications

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Noble metal-free V

Hui Zou1, Guansheng Xiao, Kaihao Chen

  • 1School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. xhpeng@mail.njust.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|September 13, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces vanadium pentoxide modified graphitic carbon nitride (V2O5/g-C3N4) composites as a novel, noble metal-free catalyst. The V2O5/g-C3N4 composite demonstrates excellent performance in olefin oxidation reactions under visible light.

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Area of Science:

  • Materials Science
  • Catalysis
  • Photochemistry

Background:

  • Graphitic carbon nitride (g-C3N4) is a metal-free semiconductor with promising photocatalytic properties.
  • Vanadium pentoxide (V2O5) is known for its catalytic activity in oxidation reactions.
  • Developing efficient and sustainable catalysts for oxidation reactions is crucial in chemical synthesis.

Purpose of the Study:

  • To synthesize and characterize vanadium pentoxide modified graphitic carbon nitride (V2O5/g-C3N4) composites.
  • To evaluate the catalytic and photocatalytic performance of V2O5/g-C3N4 composites in olefin oxidation.
  • To investigate the optimal V2O5 loading for enhanced catalytic activity.

Main Methods:

  • V2O5/g-C3N4 composites were prepared using wet impregnation and calcination.
  • Samples were characterized using various techniques including FTIR, XRD, SEM, TEM, XPS, UV-Vis, PL, ESR, and N2 adsorption/desorption.
  • Catalytic activity was assessed through the oxidation of olefins, specifically styrene to benzaldehyde, using hydrogen peroxide as an oxidant under visible light irradiation.

Main Results:

  • The V2O5/g-C3N4 composite with 3% V2O5 loading exhibited optimal catalytic performance.
  • The catalyst achieved high conversion (98.7%) and selectivity (88.4%) for the oxidation of styrene to benzaldehyde under visible light.
  • The noble metal-free catalyst system demonstrated high yields (up to 92%) for the transformation of other styrene substrates to their corresponding aldehydes.

Conclusions:

  • V2O5/g-C3N4 composites are effective noble metal-free catalysts for olefin oxidation.
  • The developed catalyst shows significant potential for sustainable and efficient synthesis of aldehydes.
  • The study proposes a plausible mechanism for the oxidation reaction, highlighting the role of V2O5/g-C3N4 in photocatalysis.