In situ assembly of ultrafine Mn3O4 nanoparticles into MIL-101 for selective aerobic oxidation,Catalysis Science & Technology

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In situ assembly of ultrafine Mn3O4 nanoparticles into MIL-101 for selective aerobic oxidation
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2017-08-14 00:00:00 , DOI: 10.1039/c7cy00912g
Yu Fu _{1,

2,

3,

4,

5} , Yanglong Guo _{1,

2,

3,

4,

5} , Yun Guo _{1,

2,

3,

4,

5} , Yunsong Wang _{1,

2,

3,

4,

5} , Li Wang _{1,

2,

3,

4,

5} , Wangcheng Zhan _{1,

2,

3,

4,

5} , Guanzhong Lu _{1,

2,

3,

4,

5}

Affiliation

Nanosize metal oxides generally possess high catalytic activity, but they tend to agglomerate into larger particles during a reaction. Therefore, the preparation of nanosize metal oxides with high stability is a crucial challenge. A novel and facile approach involving impregnation followed by a double solvent method was developed to directly encapsulate ultrafine Mn₃O₄ nanoparticles (NPs) into the nanocages of metal–organic frameworks (MOFs). A series of MIL-101 encapsulated Mn₃O₄ NPs were prepared, in which the contents of Mn₃O₄ ranged from 3.2% to 33%. Ultrafine Mn₃O₄ NPs with a particle size of about 3 nm have been successfully embedded in the nanocages of MIL-101 with a uniform distribution. The MIL-101 encapsulated Mn₃O₄ NPs with a Mn₃O₄ content of 15% exhibits the highest conversion of benzyl alcohol (38.7%) and a >99% selectivity to benzaldehyde. Furthermore, after being repeatedly used 10 times, its catalytic activity is hardly changed. When the content of Mn₃O₄ NPs was further increased, the catalytic activity of the catalyst decreases, due to aggregated Mn₃O₄ particles with a large size which formed outside the MIL-101 matrix.

中文翻译：

将超细Mn ₃ O ₄纳米粒子原位组装到MIL-101中以进行选择性好氧氧化

纳米级金属氧化物通常具有高催化活性，但是在反应过程中它们倾向于聚集成更大的颗粒。因此，制备具有高稳定性的纳米级金属氧化物是一个关键的挑战。开发了一种新颖，简便的方法，包括浸渍和随后的双溶剂方法，以将超细Mn ₃ O ₄纳米颗粒（NPs）直接封装到金属有机骨架（MOFs）的纳米笼中。制备了一系列MIL-101封装的Mn ₃ O ₄ NP，其中Mn ₃ O _4的含量为3.2％至33％。超细Mn ₃ O ₄已经成功地将粒径约为3 nm的NP均匀分布在MIL-101纳米笼中。Mn ₃ O ₄含量为15％的MIL-101封装的Mn ₃ O ₄ NPs表现出最高的苯甲醇转化率（38.7％）和对苯甲醛的> 99％的选择性。此外，重复使用10次后，其催化活性几乎不变。当Mn ₃ O ₄ NPs的含量进一步增加时，由于在MIL-101基体外部形成的大尺寸的聚集的Mn ₃ O ₄颗粒的聚集，催化剂的催化活性降低。

更新日期：2017-09-19

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