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相关概念视频

Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

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相关实验视频

Updated: Jul 17, 2026

Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source
06:26

Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source

Published on: August 17, 2018

在超临界CO(2) 中烯的化,由纳米颗粒在CO(2) 中水微乳液中催化.

Hiroyuki Ohde1, Chien M Wai, Hakwon Kim

  • 1Department of Chemistry, University of Idaho, Moscow, Idaho 83844, USA.

Journal of the American Chemical Society
|April 25, 2002
PubMed
概括

合成的纳米粒子作为olefin化有效的催化剂. 这些纳米金属颗粒分散在超临界的二氧化碳中,使各种烯的快速和高效反应成为可能.

科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 催化剂是一种催化剂.

背景情况:

  • 超临界二氧化碳 (scCO2) 为化学反应提供独特的溶剂特性.
  • 为化反应开发高效的催化剂在化学合成中至关重要.
  • 控制纳米粒子的大小和分散是催化活性的关键.

研究的目的:

  • 为了合成纳米尺寸的金属颗粒.
  • 为了利用这些纳米粒子作为超临界CO2中的催化剂.
  • 为了证明纳米粒子催化剂对于化的效率.

主要方法:

  • 在CO2中的水微乳液中减少Pd2+离子的.
  • 通过微乳液稳定的纳米颗粒的合成.
  • 合成的纳米粒子在超临界CO2中用于化反应的应用.

主要成果:

  • 成功合成纳米尺寸的金属颗粒.
  • 纳米粒子在超临界流体阶段均分散.
  • 证明了水溶性和二氧化碳溶性油脂的快速和有效化.

结论:

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In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

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06:26

Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source

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In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
11:38

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
08:40

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

  • 通过微乳液合成的纳米尺寸的粒子是有效的化催化剂.
  • 超临界二氧化碳是纳米粒子催化烯酸化的一个可行的介质.
  • 开发的方法为使用纳米粒子的高效催化过程提供了一条途径.