在氧化脱硫过程中,电子移位解了过渡金属化物催化剂的活性-选择性权衡
Juncong Zou1,2, Shaohua Wu2, Yan Lin1
1College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, China.
Environmental science & technology
|August 8, 2024
概括
在金属化物催化剂中的纳米体结构工程克服了氧化脱硫 (ODS) 中的活性-选择性权衡. 在MoP/WP催化剂中的电子移位使得高活性和选择性高效的燃料脱硫成为可能.
科学领域:
- 催化剂是一种催化剂.
- 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.
背景情况:
- 活动选择性权衡在催化过程中是一个持续的挑战.
- 金属化物催化剂对于燃料的氧化脱硫 (ODS) 是至关重要的.
- 开发能够平衡高活性和选择性的催化剂对于高效的ODS至关重要.
研究的目的:
- 为了克服ODS金属化物催化剂的活性-选择性权衡.
- 调查纳米异构结构工程在提高催化剂性能方面的作用.
- 为了阐明在化 (MoP) /化 (WP) 纳米 heterostructures中的结构-活动-选择性关系.
主要方法:
- 在MoP/WP催化剂的纳米异构结构工程.
- 实验性表征和理论计算.
- 在真实柴油燃料的氧化脱硫过程中对催化性能的评估.
主要成果:
- 在MoP/WP纳米 heterostructures中的电子移位被确定为高活性和选择性的关键因素.
- 催化剂在H2O2激活过程中促进过渡到更有选择性的单片氧途径.
- 在双增强的Mo和W位点上优化反应物和中间体的吸附.
- 从真正的柴油中实现了100%的提化合物去除,具有高周转频率 (105.4h-1) 和低O/S比 (4).
结论:
- 纳米异构结构工程成功地解开了ODS金属化物催化剂的活性选择性权衡.
- 电子移位对于同时优化活动和选择性至关重要.
- 该战略提供了基本的见解,并激发了ODS及其他领域先进催化剂的开发.
相关概念视频
Crystal Field Theory - Octahedral Complexes
26.3K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.3K
π Electron Effects on Chemical Shift: Overview
1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K
Preparation and Reactions of Sulfides
4.8K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
4.8K
Directing and Steric Effects in Disubstituted Benzene Derivatives
3.0K
When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
3.0K
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H
5.5K
All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
5.5K


