Plausibility of potassium ion-exchanged ZSM-5 as soot combustion catalysts.
Plausibility of potassium ion-exchanged ZSM-5 as soot combustion catalysts.
复制标题
钾离子交换 ZSM-5 作为烟灰燃烧催化剂的合理性
DOI：
10.1038/s41598-017-03504-3
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发表时间：
2017-06-12
影响因子：
4.6
通讯作者：
Zhang Z
中科院分区：
文献类型：
--
作者：
Lu C;Liu T;Shi Q;Li Q;Xin Y;Zheng L;Zhang Z
对钾离子交换的ZSM-5分子筛催化燃烧碳烟进行了研究。X-射线吸收精细结构(XAFS)、拉曼光谱、原位红外光谱和NH3-程序升温脱附(NH3-TPD)证实了K+在离子交换中心的位置。程序升温氧化(TPO)反应表明，K-ZSM-5降低了碳烟燃烧的着火温度，提高了对CO2的选择性。通过降低Si/Al比增加K+交换量，提高了碳烟燃烧活性。18O2同位素等温反应表明K+离子活化了气态氧。这说明了碱金属交换沸石的新应用和提高催化烟尘燃烧活性的策略。
Potassium (K) ion-exchanged ZSM-5 zeolites were investigated for catalytic soot combustion. X-ray absorption fine-structure (XAFS), Raman,in situIR 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.18O2isotopic 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.