1. Effects of Zn loading on ZnxCo1−xCo2O4 spinel catalysts for low-temperature catalytic decomposition of N2O in the presence of inhibitors.
- Author
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Prajitno, Hermawan, Kim, Jeongtak, Jeong, Min Hye, Choi, Sun A, Hwang, Sun-Mi, and Kwan Jeong, Soon
- Subjects
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SPINEL , *FLUE gases , *CATALYSTS , *NITROUS oxide , *CARBON dioxide , *ZINC catalysts , *COBALT catalysts , *SPINEL group - Abstract
[Display omitted] • Development of NH 3 -fuel demands catalytic de-N 2 O unit for stack gas treatment. • Zn x Co 1− x Co 2 O 4 spinel catalysts were evaluated for low-temperature de-N 2 O. • T 50 of 203.3 °C and X N2O of 94.2 % at 250 °C were achieved when x = 0.73. • Zn induced the formation of oxygen vacancies, enhancing the resistance to O 2. • Zn strengthen the bond between Co and –NO species. The recent advancement of NH 3 -based fuel demands the development of catalysts that can decompose N 2 O at low temperatures and are stable against various inhibitors. Zn-doped cobalt spinel (Zn x Co 1− x Co 2 O 4) catalysts have demonstrated superior activity for N 2 O decomposition at low temperatures. However, their optimization and deactivation mechanisms with respect to Zn loading when inhibitors are present require further investigation. Herein, we reviewed the effects of Zn loading on catalysts at low temperatures without or with the presence of inhibitors (3 vol% O 2 , 6 vol% H 2 O, 200 ppm NO). The results showed that adding an appropriate amount of Zn into Co 3 O 4 spinel catalysts improves their N 2 O decomposition activity. The Zn-induced enhancement of the catalysts' redox properties, and reducibility was the underlying mechanism behind the activity promotion. The presence of structural defects created through the addition of Zn enhanced the catalyst's resistance to O 2. The deactivation by H 2 O and NO upon the addition of Zn could be correlated with the reduced availability of surface Co species and Co2+ as adsorption-active sites and the stronger bond of Co with –NO, respectively. This study underscores the importance of controlling the Zn loading as a bulk redox promoter in Zn x Co 1− x Co 2 O 4 spinel catalysts for practical applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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