Plausibility of potassium ion-exchanged ZSM-5 as soot combustion catalysts

Chenxi Lu; Taizheng Liu; Qiaolan Shi; Qian Li; Ying Xin; Lei Zheng; Zhaoliang Zhang

doi:10.1038/s41598-017-03504-3

Scientific Reports (Jun 2017)

Plausibility of potassium ion-exchanged ZSM-5 as soot combustion catalysts

Chenxi Lu,
Taizheng Liu,
Qiaolan Shi,
Qian Li,
Ying Xin,
Lei Zheng,
Zhaoliang Zhang

Affiliations

Chenxi Lu: School of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chsemistry and Chemical Materials, University of Jinan
Taizheng Liu: School of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chsemistry and Chemical Materials, University of Jinan
Qiaolan Shi: School of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chsemistry and Chemical Materials, University of Jinan
Qian Li: School of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chsemistry and Chemical Materials, University of Jinan
Ying Xin: School of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chsemistry and Chemical Materials, University of Jinan
Lei Zheng: Institute of High Energy Physics, Chinese Academy of Sciences
Zhaoliang Zhang: School of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chsemistry and Chemical Materials, University of Jinan

DOI: https://doi.org/10.1038/s41598-017-03504-3
Journal volume & issue: Vol. 7, no. 1
pp. 1 – 8

Abstract

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Abstract Potassium (K) ion-exchanged ZSM-5 zeolites were investigated for catalytic soot combustion. X-ray absorption fine-structure (XAFS), Raman, in situ IR and NH3-temperature programmed desorption (NH3-TPD) confirmed the location of K+ at the ion-exchanged sites. Temperature-programmed oxidation (TPO) reactions showed that K-ZSM-5 decreased ignition tempeatures of soot combustion and increased selectivity to CO2. The improved activity for soot combustion by increasing K+-exchanged amounts via decreasing the Si/Al ratio reinforced the K+ ions participating in soot combustion. 18O2 isotopic isothermal reactions suggested the activation of gaseous oxygen by the K+ ions. This demonstrated a new appliction of alkali metal exchanged zeolites and the strategy for enhancement of catalytic soot combustion activity.

Published in Scientific Reports

ISSN: 2045-2322 (Online)
Publisher: Nature Portfolio
Country of publisher: United Kingdom
LCC subjects: Medicine; Science
Website: https://www.nature.com/srep/

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