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関連する概念動画

Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

12.4K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.4K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

6.9K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
6.9K
Aldehydes and Ketones to Alkanes: Wolff–Kishner Reduction01:09

Aldehydes and Ketones to Alkanes: Wolff–Kishner Reduction

4.0K
Wolff–Kishner reduction involves converting aldehydes and ketones to alkanes using hydrazine and a base. The reaction converts a carbonyl group to a methylene group. The method was independently discovered by N. Kishner in 1911 and L. Wolff in 1912. The reduction is carried out in high-boiling solvents such as ethylene glycol and diethylene glycol because heat is required to deprotonate the N–H proton in one of the reaction steps.
4.0K
Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

2.3K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
2.3K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

5.6K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
5.6K
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

1.4K
The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
1.4K

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関連する実験動画

Updated: Apr 29, 2026

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
09:46

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5

Published on: August 25, 2016

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メタンからの窒素の排斥は"落とし穴"K-ZSM-25ゼオライトを通過する

Jianhua Zhao1, Seyed Hesam Mousavi1, Gongkui Xiao2

  • 1Department of Chemical Engineering, The University of Melbourne, Parkville, Melbourne, VIC 3010, Australia.

Journal of the American Chemical Society
|September 13, 2021
PubMed
まとめ

新しいゼオライト,K-ZSM-25は,メタン (CH) から選択的に窒素 (N2) を捕獲する分子トラップドアとして作用する. この温度調節プロセスは,天然ガスを処理するための新しいエネルギー効率の良い方法を提供します.

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Ammonia Synthesis at Low Pressure
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Experimental Study of the Relationship Between Particle Size and Methane Sorption Capacity in Shale

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Last Updated: Apr 29, 2026

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
09:46

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5

Published on: August 25, 2016

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Ammonia Synthesis at Low Pressure
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Ammonia Synthesis at Low Pressure

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Experimental Study of the Relationship Between Particle Size and Methane Sorption Capacity in Shale
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科学分野:

  • 材料科学
  • 化学工学
  • 分離科学

背景:

  • 窒素 (N2) をメタン (CH4) から分離することは,それらの類似した性質のため,天然ガス加工に不可欠です.
  • N2/CH4の分離のための選択材料の開発は,ガス産業における長年の課題でした.
  • 低温蒸留のような既存の方法は エネルギー密集的です

研究 の 目的:

  • メタンから選択的に窒素を放出するための新しいゼオライト材料K-ZSM-25を報告する.
  • K-ZSM-25における温度調節によるガス吸着のメカニズムを調査する.
  • N2/CH4の分離のための新しいエネルギー効率的なアプローチを実証する.

主な方法:

  • K-ZSM-25ゼオライトの合成と特徴付け
  • 実験的なガス吸附試験を様々な温度で行う.
  • 分子動力学 (MD) のシミュレーションと初期密度関数理論 (DFT) の計算.

主要な成果:

  • K-ZSM-25は34まで高いN2/CH4の選択性を示しています.
  • ゼオライトは温度調節された吸収を示し,N2を許容し,CH4を240〜300Kの範囲で拒絶する.
  • 解明されたメカニズム:K + カチオンの熱振動は,ガス分子サイズに基づいて孔のアクセシビリティを制御します.

結論:

  • K-ZSM-25は,効率的なN2をCH4から分離するための分子トラップドアゼオライトとして機能します.
  • 温度調節による吸収は,エネルギー集約的な分離技術に有望な代替手段です.
  • このアプローチは,より持続可能な天然ガス処理の道を開きます.