Fluorine-enhanced Pt/ZSM-5 catalysts for low-temperature oxidation of ethylene
Fluorine-enhanced Pt/ZSM-5 catalysts for low-temperature oxidation of ethylene
复制标题
用于乙烯低温氧化的氟增强Pt/ZSM-5催化剂
DOI：
10.1039/c8cy00130h
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发表时间：
2018-04-07
影响因子：
5
通讯作者：
Hao, Zhengping
中科院分区：
文献类型：
--
作者：
Yang, Hongling;Ma, Chunyan;Hao, Zhengping
乙烯（C2 H4）的低温氧化在某些特定的场所和环境如冷藏库中至关重要，但催化剂的稳定性需要进一步提高。本研究制备的微孔Pt/ZSM-5催化剂在C2 H4氧化反应中表现出优异的催化性能。进一步研究了F对Pt/ZSM-5催化剂的改性，探讨了其提高乙烯低温氧化催化性能的可能性。与未改性的Pt/ZSM-5催化剂相比，F改性有效地提高了Pt/ZSM-5催化剂的反应稳定性。在25 ℃下，0.5%Pt/F-ZSM-5催化剂上C_2H_4的转化率可保持在100%以上11 h。研究表明，催化剂的酸性和耐水性是影响催化剂稳定性的重要因素。F处理后ZSM-5分子筛的Bronsted酸性增强，有利于C_2H_4分子在Pt/F-ZSM-5催化剂上的吸附和活化。F改性提高了催化剂的耐水性，延长了催化剂的使用寿命。因此，Pt/F-ZSM-5有可能成为一种有效的低温催化剂，用于C2 H4消除在可能的应用。
The low-temperature oxidation of ethylene (C2H4) is of critical importance in some specific places and environments such as refrigeration storage, but the catalyst stability needs to be further improved. The microporous Pt/ZSM-5 catalyst prepared in this study exhibited excellent catalytic performance in C2H4 oxidation. The modification of F on Pt/ZSM-5 was further investigated to explore the possibility of enhancing the catalytic performance for low-temperature oxidation of ethylene. Compared with unmodified Pt/ZSM-5 catalyst, the F modification has efficiently improved the reaction stability of the Pt/ZSM-5 catalyst. The conversion of C2H4 over 0.5% Pt/F-ZSM-5 could be sustained at 100% for more than 11 h at 25 degrees C. This study showed that the acidity and water tolerance of catalysts were crucial factors that affected the catalytic stability. The enhancement of the Bronsted acidity of the F-treated ZSM-5 was favourable for the adsorption and activation of C2H4 molecules onto the Pt/F-ZSM-5 catalysts. The F modification prolonged the catalyst life by improving its water tolerance. Thus, Pt/F-ZSM-5 has the potential to be an efficient low-temperature catalyst for C2H4 elimination in possible applications.