增强基吸附和改进的甘油吸附配置,以提高高效的甘油酸生产
Zupeng Li1, Ning Li1, Xue Zhong1
1College of Chemical Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China.
Journal of colloid and interface science
|November 6, 2024
概括
这项研究通过开发支持-氧化的新型催化剂来提高糖醇氧化反应 (GOR) 的性能. 新的Pd/NiCo(OH) 2催化剂显示了增值产品的提高活性和选择性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 糖醇氧化反应 (GOR) 对于生产增值化学品至关重要,但在反应性和选择性方面面临挑战.
- 目前的催化剂经常因性能不足而扎,限制了工业应用.
研究的目的:
- 开发高活性和选择性电催化剂,用于甘油氧化反应.
- 调查不同含有阴离子的支物对纳米粒子性能的影响.
- 了解结构-活性关系,控制增强的糖氧化.
主要方法:
- 纳米颗粒的电子沉积在NiFe (((OH) 2 ,NiCo (((OH) 2) 和Ni (((OH) 2) 的支架上.
- 电化学表征包括活性,选择性,动力学和稳定性测试.
- 密度函数理论 (DFT) 计算以阐明催化机制.
主要成果:
- Pd/NiCo(OH) 2催化剂表现出卓越的性能,其活性为128.8mA·cm-2在0.95V与RHE相比,对甘油酸 (GLA) 的选择性为67%.
- 与纯相比,观察到更好的反应动力学和稳定性.
- DFT和实验数据显示,改进的性能是由于较低的d频段中心,独特的纳米基层阵列微观结构,高OHads覆盖率,以及在金属支接口上的糖醇和的最佳吸附.
结论:
- 该Pd/NiCo(OH) 2催化剂代表了糖醇氧化电催化学的重大进步.
- 金属支相互作用和定制的纳米结构是优化催化剂性能的关键因素.
- 这项工作为GOR和其他电化学反应设计高效催化剂提供了一个新的策略.
相关概念视频
01:13Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
2.7K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
2.7K
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.3K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.3K
01:20Aldehydes and Ketones with Water: Hydrate Formation
3.1K
An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
3.1K
02:45Acid-Catalyzed Hydration of Alkenes
13.7K
Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
13.7K
02:35Acid-Catalyzed Dehydration of Alcohols to Alkenes
19.3K
In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
19.3K
02:15Preparation of Alcohols via Addition Reactions
6.1K
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
6.1K