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Updated: Jul 16, 2026

CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
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CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

Published on: June 12, 2019

二酸化窒素からの室温アンモニアの形成は,金属特性を持つ減少したメソポラス型酸化チタンの表面上に発生する

Melissa Vettraino1, Michel Trudeau, Andy Y H Lo

  • 1Contribution from the Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Ontario, Canada N9B-3P4.

Journal of the American Chemical Society
|August 9, 2002
PubMed
まとめ

研究者らは,メソポラス型酸化チタンと有機金属化合物から新しい青黒の導電性物質を開発した. このプロセスは,大気中の窒素を予期せぬ形でアンモニアに変換し,これは分子シートでは珍しい触媒的功績である.

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Redox Reactions01:24

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

Oxidation–Reduction Reactions
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Alkali Metals

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
Noble Gases02:54

Noble Gases


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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Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
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Acid Halides to Alcohols: LiAlH4 Reduction

Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...