有效的光热催化甲干重塑在富含氧气的空缺催化剂上
Lingxin Meng1, Yuteng Jia1, Shaowen Wu1
1School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China. swwu@sdust.edu.cn.
概括
在La2O3上的催化剂有效地使用光线将CO2和CH4转化为H2和CO. 这种光热催化显示出高产量和耐久性,而La2O3增强了对碳沉积的稳定性.
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
- 可再生能源可再生能源是可再生能源.
背景情况:
- 对二氧化碳利用而言,甲干改造 (DRM) 是至关重要的.
- 光热催化为提高DRM效率提供了一个有前途的途径.
- 在光照射下开发稳定和活跃的DRM催化剂至关重要.
研究的目的:
- 为了合成和评估支持ZrO2,La2O3和La2Zr2O7的Ni纳米粒子,用于光热催化DRM.
- 研究支持材料在催化剂性能和稳定性中的作用.
- 了解在光照射下增强活性和稳定性的机制.
主要方法:
- 在ZrO2,La2O3和La2Zr2O7.7的支持下制备Ni纳米粒子.
- 在聚焦光照射下进行的甲光热催化干燥改造 (DRM) 实验.
- 结构特征 (如表面积,多孔度,组成) 和现场/操作分析.
主要成果:
- 使用光热催化实现了高H2 (76.2 mmol g-1 min-1) 和CO (99.1 mmol g-1 min-1) 的产量,使用光热催化实现了优异的耐用性 (50小时).
- 与其他催化剂相比,10Ni/La2O3对碳沉积具有优越的抗性.
- 通过丰富的氧气空缺,La2O3支持促进了CO2吸附和激活,促进了碳氧化.
结论:
- 光照明通过光热转换驱动DRM,并增强催化活性和稳定性.
- 强大的Ni-La2O3接口和La2O3中的氧空缺是改善CO2激活和碳氧化的关键.
- /La2O3是光热DRM的高效催化剂,为CO2转化提供了一个可持续的途径.
相关概念视频
Catalysis
26.6K
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.
26.6K
Reduction of Alkenes: Catalytic Hydrogenation
11.8K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
11.8K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
4.3K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
4.3K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.6K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
7.6K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.2K
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...
3.2K


