1 option
First Principle Study of Catalyst's Influence on Self-Inhibition Effect and By-Products Formation of Lean NOx Trap FAW R&D Center Department of Powertrain Development, Chi
- Format:
- Book
- Conference/Event
- Author/Creator:
- Liu, Mingli, author.
- Conference Name:
- SAE 2024 Vehicle Powertrain Diversification Technology Forum (2024-12-06 : Xi'An, China)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2025
- Summary:
- Lean NOx trap is a dedicated DeNOx catalyst for lean hybrid gasoline engines. Noble metals (usually platinum group metals) play the role of catalytic sites for NOx oxidation and reduction, which have significant impact of the performance of LNT. This work focuses on the influence of noble metal catalysts on self-inhibition effect from the view of competitive adsorption between NO and CO, and investigates the influence of CO self-inhibition effect on the main by-product of LNT: N2O formation. Adsorption configurations for NO, CO and N2O on noble metal clusters supported by γ-Al2O3(100) are confirmed. For detailed investigation, electron structures are analyzed by investigating Bader charge, DOS (density of state), charge density differences and COHP (crystal orbital Hamilton population) of selected configurations.The results show that CO self-inhibition effect is caused by competitive adsorption between CO and NO. The essence of competitive adsorption between CO and NO is that adsorption process of CO and NO on catalytic sites is similar. Excessive adsorption of CO on the catalytic site occupies the catalytic site and limits the NO adsorption and subsequent processes, making NO conversion efficiency decrease. Competitive adsorption between CO and NO will limit NO adsorption and dissociation, thus limiting N2O formation. Meanwhile, stronger adsorption of N2O on catalytic sites will make N2O desorption difficult
- Notes:
- Vendor supplied data
- Publisher Number:
- 2025-01-7042
- Access Restriction:
- Restricted for use by site license
The Penn Libraries is committed to describing library materials using current, accurate, and responsible language. If you discover outdated or inaccurate language, please fill out this feedback form to report it and suggest alternative language.