铜上的硫增强活性可提高电催化酸盐与氨的选择性
Yue Xu1, Chuanqi Cheng2, Jiewei Zhu1
1School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China.
Angewandte Chemie (International ed. in English)
|February 19, 2024
概括
用硫添加的铜催化剂显著改善了电催化酸盐降解为氨的过程,达到98.3%的氨选择性,并将酸盐副产品降到最低. 这一进步增强了污染物修复策略.
科学领域:
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 环境科学 环境科学
背景情况:
- 用电催化剂将酸盐减少为氨,为污染物修复提供了一个有前途的途径.
- 基于铜的催化剂由于酸盐吸附而表现出潜力,但与活性气形成作斗争,导致酸盐副产品.
- 提高氨的选择性,同时减少酸盐对于高效的酸盐转化至关重要.
研究的目的:
- 开发一种用硫添加的铜催化剂 (Cu-S) 用于增强电催化酸盐降解为氨.
- 调查硫注射对催化剂性能和选择性的影响.
- 使用现场表征和理论计算,了解改善氨选择性背后的机制.
主要方法:
- 电化学转化策略合成硫合铜 (Cu-S) 催化剂.
- 电催化酸盐还原实验,以评估氨和酸盐的选择性.
- 在现场进行电化学表征和理论计算以阐明反应机制.
主要成果:
- -S催化剂实现了氨 (~98.3%) 的高法拉代效率 (FE) 和酸盐 (~1.4%) 的低FE.
- 这种性能明显优于未使用过的铜催化剂 (FENH3: 70.4%,FENO2-: 18.8%).
- 硫兴奋剂促进了水分离到活性,并降低了NO2的化屏障,提高了氨的选择性.
结论:
- 铜催化剂中的硫化是一种有效的策略,可以在电催化酸盐减少中提高氨的选择性.
- -S催化剂在将酸盐转化为氨方面表现出色,最大限度地减少了有害的酸盐副产品.
- 这项工作为有效和选择性的电化学污染物修复提供了对催化剂设计的见解.
更多相关视频
相关概念视频
Catalysis
26.9K
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.
26.9K
Electrophilic Aromatic Substitution: Nitration of Benzene
6.0K
The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
6.0K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.3K
Electrodeposition
633
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
633
Preparation of Amines: Reduction of Oximes and Nitro Compounds
3.6K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
3.6K


