Merging periodic mesoporous organosilica (PMO) with mesoporous aluminosilica (Al/Si-PMO): A catalyst for green oxidation
Merging periodic mesoporous organosilica (PMO) with mesoporous aluminosilica (Al/Si-PMO): A catalyst for green oxidation
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DOI：
10.1016/j.mcat.2019.110676
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发表时间：
2020-02-01
影响因子：
4.6
通讯作者：
Assadi, M. Hussein N.
中科院分区：
文献类型：
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作者：
Doustkhah, Esmail;Mohtasham, Hamed;Assadi, M. Hussein N.
介孔硅铝是一种独特的催化结构，这是由于铝的刘易斯酸性。在这里，我们设计了一种新的催化剂，通过合并周期性介孔有机硅与硅铝酸盐到它的结构，而不是单纯的二氧化硅。在该合成中使用的有机硅桥是基于硫脲的有机硅氧烷前体，其在支持催化活性阳离子方面具有独特的特征。因此，我们通过这些硫脲桥来支撑Cu 2+离子以产生具有硅铝酸盐结构的催化活性物种（Cu@Al/Si-PMO-TU）沿着。将铝硅与Cu 2+离子组合导致在二苯并噻吩的水相氧化中的协同催化活性。此外，添加Al 3+作为前驱体在PMO的合成过程中引起的介孔性和表面积的增强，并导致介孔纳米纤维的形成。所提出的绿色双功能催化剂易于回收并可重复使用几个连续的循环。
Mesoporous aluminosilica is a unique structure for catalysis due to Lewis acidity of aluminum. Here, we design a new catalyst by merging periodic mesoporous organosilica with aluminosilica into its structure instead of mere silica. The employed organosilica bridge in this synthesis is a thiourea based organosiloxane precursor which has a unique feature in supporting catalytically active cations. Therefore, we support Cu2+ ions through these thiourea bridges to generate a catalytically active species along with aluminosilica structure (Cu@Al/Si-PMO-TU). Combining alminosilica with Cu2+ ions led to a synergistic catalytic activity in the aqueous oxidation of dibenzothiophene. Furthermore, the addition of Al3+ as a precursor during the synthesis of PMO causes an enhancement in the mesoporosity and surface area and led to the formation of mesoporous nanofibers. The proposed green bifunctional catalyst is easily recoverable and reusable for several consecutive cycles.