有效的In/SSZ-39催化剂用于选择性催化降解NO与CH4
Sufeng An1, Peng Wang1, Kuanling Wang1
1SINOPEC (Dalian) Research Institute of Petroleum and Petrochemicals, Dalian, China.
Frontiers in chemistry
|August 12, 2024
概括
在SSZ-39分子上使用的 (In) 催化剂在甲选择性催化氧化降解 (CH4-SCR) 方面表现优越. 3In/SSZ-39催化剂在400°C达到90%的NO转化,突出显示.
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
- 环境化学环境化学
背景情况:
- 氧化物 (NOx) 的选择性催化还原 (SCR) 对于排放控制至关重要.
- 甲 (CH4) 为NOx去除提供了一个有前途的减少剂,但需要有效的催化剂.
- 像SSZ-39这样的小孔泽奥利特被探索为SCR催化剂的支物.
研究的目的:
- 为了合成和描述CH4-SCR的M/SSZ-39催化剂 (M=In,Co,Cu,Fe)
- 评估不同金属种类和负载对催化性能的影响.
- 为了确定最佳的催化剂组合,以低温去除NOx.
主要方法:
- 催化剂合成的湿浸方法.
- 使用X射线衍射 (XRD),传输电子显微镜 (TEM),N2吸附-脱落和H2温度编程减小 (H2-TPR) 的表征.
- 在特定反应条件下评估CH4-SCR性能.
主要成果:
- In/SSZ-39催化剂的活性明显高于Cu,Co和Fe/SSZ-39.
- 不同的 (In) 载荷 (1-3 wt%) 影响了In物种的类型和催化性能.
- 在400°C时,3In/SSZ-39催化剂实现了90%的NO转化和74.2%的CH4选择性.
结论:
- 是超越SSZ-39.9的CH4-SCR的高效活性成分.
- 催化剂的性能可以通过控制负载和产生的物种来调整.
- 3In/SSZ-39催化剂显示出在低温下降低氧化物排放的巨大潜力.
相关概念视频
Catalysis
26.8K
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.
26.8K
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
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.7K
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.
7.7K
Preparation of Amines: Reduction of Oximes and Nitro Compounds
3.5K
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,...
3.5K
Reduction of Alkenes: Catalytic Hydrogenation
11.9K
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...
11.9K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
4.5K
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...
4.5K


