Durability improvements of H-ZSM-5 zeolite for ethanol conversion after treatment with chelating agents
Durability improvements of H-ZSM-5 zeolite for ethanol conversion after treatment with chelating agents
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DOI：
10.1016/j.micromeso.2015.07.031
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发表时间：
2016-01-01
影响因子：
5.2
通讯作者：
Reschetilowski, Wladimir
中科院分区：
文献类型：
--
作者：
Daeumer, Daniel;Seifert, Markus;Reschetilowski, Wladimir
用酒石酸、柠檬酸和EDTA溶液对硅铝比为12的H-ZSM-5沸石进行了处理。研究了这种处理对乙醇转化中耐久性的影响，并与提取少量铝进行了关联。量子化学部分采用M06-L/6-31G(D)作为理论水平。这些调查表明，所有的EFSPE都可以被认为是可解的，因此也是可移除的。通过固态表征(核磁共振、红外光谱、X射线衍射仪)，没有观察到块体性能的变化，尽管处理后的样品的催化测试显示出显著的耐久性改善。这一表面上的矛盾可以用去除EFSPE后对油气藏的乙烯供应的变化来解释，EFSPE作为仅催化脱水反应的活性中心。(C)2015 Elsevier Inc.保留所有权利。
An H-ZSM-5 zeolite (Si/Al = 12) was treated with solutions of tartaric acid, citric acid and EDTA. The impact of this treatment on the durability in the conversion of ethanol was investigated and correlated with the extraction of small amounts of aluminium. M06-L/6-31G(d) was applied as level of theory for the quantum chemical part of this work. These investigations showed that all EFSPE can be regarded as solvable and hence also as removable. By solid state characterisations (NMR, IR, XRD) no changes in the bulk properties were observed, although catalytic testings of the treated samples showed significant durability improvements. This ostensible contradiction can be explained by a changed ethene supply to the hydrocarbon pool after the removal of EFSPE acting as active sites which catalyse only dehydration reactions. (C) 2015 Elsevier Inc. All rights reserved.