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

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作者：
Chenxi Lu
Taizheng Liu
Qiaolan Shi
Qian Li
Ying Xin
Lei Zheng
Zhaoliang Zhang
机构：
[1] School of Chemistry and Chemical Engineering,
[2] Shandong Provincial Key Laboratory of Fluorine Chsemistry and Chemical Materials,undefined
[3] University of Jinan,undefined
[4] Institute of High Energy Physics,undefined
[5] Chinese Academy of Sciences,undefined
来源：
Scientific Reports | / 7卷
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摘要：
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.
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