Silver-Based 4A Zeolite Composite Catalyst for Styrene Epoxidation by One-Pot Hydrothermal Synthesis
Silver-Based 4A Zeolite Composite Catalyst for Styrene Epoxidation by One-Pot Hydrothermal Synthesis
复制标题
一锅水热合成苯乙烯环氧化银基4A沸石复合催化剂
DOI：
10.1002/ejic.201500443
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发表时间：
2015
影响因子：
2.3
通讯作者：
Sun Weiyan
中科院分区：
文献类型：
--
作者：
Hu Xiaosong;Bai Jie;Li Chunping;Liang Haiou;Sun Weiyan
通过简便的一锅水热法成功合成了银基4A沸石复合催化剂。在沸石结晶过程中，银离子与沸石晶核充分混合，形成银纳米颗粒。通过FTIR光谱、漫反射紫外/可见光谱、扫描电子显微镜(SEM)、场发射SEM(FESEM)、X射线衍射(XRD)、透射电子显微镜(TEM)和X射线光电子能谱(XPS)对催化剂进行了表征。银纳米粒子在4A沸石内外分布相对均匀。此外，还测试了苯乙烯环氧化的催化性能，所制备的催化剂表现出优异的催化活性。综合考察催化剂用量、反应时间和不同溶剂，银基4A沸石复合催化剂在乙腈中充分发挥催化活性。苯乙烯转化率为80.8%，氧化苯乙烯（SO）选择性达到89.2%。
A silver‐based 4A zeolite composite catalyst had been successfully synthesized by a facile one‐pot hydrothermal method. Silver ions were fully mixed with the zeolite crystal nucleus and formed silver nanoparticles in the process of zeolite crystallization. The catalyst was characterized by FTIR spectroscopy, diffuse‐reflectance UV/Vis spectroscopy, scanning electron microscopy (SEM), field‐emission SEM (FESEM), X‐ray diffraction (XRD), transmission electron microscopy (TEM), and X‐ray photoelectron spectroscopy (XPS). The distribution of the silver nanoparticles is relatively homogeneous inside and outside of the 4A zeolite. Furthermore, the catalytic performance for the epoxidation of styrene was tested, and the prepared catalyst showed excellent catalytic activity. The catalyst amount, reaction time, and different solvents were comprehensively investigated, and the catalytic activity of the silver‐based 4A zeolite composite catalyst was displayed fully in acetonitrile. The conversion of styrene was 80.8 %, and the selectivity of styrene oxide (SO) reached 89.2 %.