msepostdoc-list Seminar Reminder for Pilsun Yoo's Preliminary Exam, Seminar, Monday, Dec. 4, at 9:30 a.m., in HAMP 2123, and Exam, 11:00 a.m., in ARMS 2007. " First Principle Study for NO Oxidation in Perovskite Oxide"

[Son, Rosemary E]

Please consider attending the following:

MATERIALS ENGINEERING
SEMINAR


"First Principle Study for NO Oxidation in Perovskite Oxide"


By
Pilsun Yoo
Purdue MSE Ph.D. Preliminary Exam

Advisor: Peilin Liao



ABSTRACT


Among composition of emission gas, NOx (x = 1, 2) is abundant and environmentally damaging molecule with operation of diesel engines which is associated with acid rain, smog, and ozone depletion. To decompose NOx (x = 1, 2), Pt-based catalyst demonstrated highest conversion rate for NOx decomposition in NOx storage and reduction (NSR) process. Recently, La based perovskite comes into the spotlight for an alternative catalyst due to several disadvantages of Pt-based catalyst such as high cost, thermal instability, aging effect and surface oxidation under operation condition. The NO oxidation property of La based perovskite catalysts was observed to be highly dependent on different transition metals in B site and substitution of La in LaBO3. In particular, it was noted that the oxygen vacancies driven by substitution and doping of other elements were related to the conversion rate. However, the role of oxygen vacancies on NO oxidation process was not explicitly known in previous studies. In this regard, understanding the reaction mechanism should precede to further suggest promoted and optimized alternative catalysts. This study will make it possible to suggest optimized compositions based on the understanding on the mechanism related to lattice oxygen vacancies.

Date: Monday, December 4, 2017

Time: 9:30 A.M.
Place: HAMP 2123

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