量化化学吸收氧气的二维驱动模式和粒子大小对NO减少活动和机制的量化
Wentao Mu1, Shichao Ma1, Hao Chen1
1School of Chemistry and Chemical Engineering, Pulp & Paper Engineering State Key Laboratory of China, South China University of Technology, Guangzhou 510640, P. R. China.
ACS applied materials & interfaces
|July 15, 2023
概括
这项研究介绍了化学吸收氧气密度和颗粒大小作为量化结构-活性关系的关键描述因素,以减少基催化剂中的NO,揭示了这些因素如何调节反应机制和效率.
科学领域:
- 不同质的催化剂.
- 表面科学是一门科学.
- 反应动力学反应动力学
背景情况:
- 在异质催化中量化结构-活性关系仍然具有挑战性.
- 了解反应机制对于催化剂设计至关重要.
- 基于Mn的催化剂被广泛用于NO降低.
研究的目的:
- 在NO降低中开发结构-活性关系的定量描述符.
- 阐明催化剂特性在反应机制中的作用.
- 建立催化剂性能的预测模型.
主要方法:
- 基于Mn的催化剂的表征.
- 对选择性催化降低NO的活性测量.
- 开发二维描述器:化学吸收氧气密度 (ρO) 和粒子大小 (dTEM).
- 使用拟合函数和现场流动的定量分析.
主要成果:
- 化学吸收氧气密度和颗粒大小被确定为关键描述因素.
- 这些描述符对激活能量 (Ea) 和反应效率 (RE) 进行定量调节.
- 描述符在调节 Ea 和 RE 中的主导作用逐渐演变.
- 一个Langmuir-Hinshelwood机制被识别并由描述器调节.
结论:
- 这项研究为了解异质催化中的活性调制提供了定量框架.
- 提出的描述符提供了对结构-活动关系和反应机制的见解.
- 这项工作有助于合理设计高效的催化剂,以减少NO.
相关概念视频
Multi-Step Reactions
7.4K
Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
7.4K
Rate-Determining Steps
32.8K
Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
32.8K
Reaction Yield
51.4K
The theoretical yield of a reaction is the amount of product estimated to form based on the stoichiometry of the balanced chemical equation. The theoretical yield assumes the complete conversion of the limiting reactant into the desired product. The amount of product that is obtained by performing the reaction is called the actual yield, and it may be less than or (very rarely) equal to the theoretical yield.
51.4K


