对NO的环境催化x通过操纵活跃站点的动态协调环境来减少减少
Lupeng Han1, Xiyang Wang2, Fuli Wang1
1Innovation Institute of Carbon Neutrality, International Joint Laboratory of Catalytic Chemistry, State Key Laboratory of Advanced Special Steel, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China.
这项研究开发了一种新型的低温氧化 (NOx) 减少催化剂,该催化剂耐受二氧化硫 (SO2). 通过设计活点的协调环境,催化剂即使在存在SO2的情况下也保持了高效率.
科学领域:
- 环境催化剂环境催化剂
- 材料科学 材料科学 材料科学
- 协调化学 协调化学
背景情况:
- 实现对二氧化硫 (SO2) 耐受性的环境催化剂以减少氧化 (NOx) 是具有挑战性的,因为不活跃的硫酸盐物种的形成.
- 存在的SO2很容易使催化站点失活,阻碍有效的NOx减排,特别是在低温下.
研究的目的:
- 为减少NOx开发一种增强的低温SO2耐受性催化剂.
- 调查活点的动态协调环境的操纵,以提高催化剂性能和SO2阻力.
主要方法:
- 使用协调化学在TiO2支上制造具有短距离有序Ce-O-Si结构的SiO2-CeO2复合氧化物.
- 分析SO2暴露下的活跃地点的动态协调环境.
- 评估NOx去除效率和反应剂吸附/激活能力.
主要成果:
- 证明了一个动态的协调环境,在SO2的存在下,从Ce-O-Si转变为低协调的Ce-SO4(2-) 物种.
- 工程低协调的Ce-SO4(2-) 物种作为活性站点起作用,保持高的NOx去除效率.
- 催化剂保持了NOx和氨 (NH3) 反应物的优良吸附和激活能力.
结论:
- 调节硫酸活性站点的协调环境是一种可行的策略,可以提高催化剂中SO2的抗性.
- 这种方法为设计用于实际环境应用的耐SO2催化剂提供了新的视角.
- 开发的催化剂在含有SO2的环境中显示出有效的低温NOx减排的巨大潜力.
更多相关视频
08:32Application of Genetically Encoded Fluorescent Nitric Oxide (NO•) Probes, the geNOps, for Real-time Imaging of NO• Signals in Single Cells
Published on: March 16, 2017
11:47The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
Published on: July 4, 2017
相关概念视频
Catalysis
Introduction to Mechanisms of Enzyme Catalysis
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
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...
Preparation of Amines: Reduction of Oximes and Nitro Compounds
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,...
Enzymes
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H
