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相关概念视频

Polyprotic Acids03:38

Polyprotic Acids

29.1K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
29.1K
Factors Affecting Solubility04:01

Factors Affecting Solubility

33.4K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.4K
Titration of Polyprotic Base with a Strong Acid01:18

Titration of Polyprotic Base with a Strong Acid

786
The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
786

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相关实验视频

Updated: Jun 18, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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使用四化水溶性二氧化碳和二氧化碳电解的显著改进

Scheryn E Lawson1, Ryan J Roberts1, Daniel B Leznoff1

  • 1Department of Chemistry, Simon Fraser University, 8888 University Drive Burnaby BC, Burnaby V5A1S6, Canada.

Journal of the American Chemical Society
|July 31, 2024
PubMed
概括

新的催化剂有效地将二氧化碳 (CO2) 转化为一氧化碳 (CO). 这些水溶性酸催化剂具有很高的循环频率,可在性介质中实际减少二氧化碳.

科学领域:

  • 电化学
  • 催化剂
  • 绿色化学

背景情况:

  • 二氧化碳 (CO2) 转化对于减轻温室气体排放和生产有价值的化学物质至关重要.
  • 现有的二氧化碳捕获方法通常使用水性性溶液,因此需要在这些环境中有效的催化剂.

研究的目的:

  • 在水溶液中开发新型催化剂设计以实现高效的电化学二氧化碳转化.
  • 调查有效地在各种pH值范围内工作的催化剂,包括性条件.

主要方法:

  • 合成修改后的 (II) 分子与阴离子三甲基组,以提高水溶性.
  • 在和二氧化碳的水溶液中进行电化学二氧化碳减少实验.
  • 密度函数理论 (DFT) 计算以阐明催化机制和中间稳定.

主要成果:

  • 在pH4.5至10.5的水溶液中证明有效的二氧化碳转化,包括2MKHCO3 (pH8.2).
  • 在低催化剂度 (250 nM) 达到高周转频率 (> 10^3 s^-1).
  • 与相关的甲催化剂相比,鉴定了增强的催化活性,归因于中间体的阴离子组稳定.

结论:

  • 新型分子结构提供水溶性,稳定关键中间体,导致优异的催化性能.

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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

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

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  • 这项工作为基于二氧化的同质水性减排催化剂建立了新的基准.
  • 为溶液应用开发实用的二氧化碳减排催化剂提出了一个可行的策略.