ENHANCEMENT OF ACIDITY AND CATALYTIC ACTIVITY OF ALUMINA BASED METAL ORGANIC FRAMEWORK (MIL-53 Al)

Yıl 2017, Sayı: 1, 404 - 410, 09.11.2017

Esra Yilmaz Emine Sert Ferhan Sami Atalay

Öz

Metal organic frameworks are highly porous materials which are formed by
combination of metal precursor and salts as inorganic part and ligand as
organic part. They have many advantages such as low density, high surface area,
tunable pore size and high porosity. Due to peculiar features, such as
unsaturated metal active sites, high surface area and easily functionalization,
its usage as catalyst are promising.

 

The MIL-53(Al) structure contains chains of trans
corner-sharing [AlO₄(OH)₂] octahedra that are connected
to each other by 1,4 benzenedicarboxylate (BDC) ligands, and thus 3D net in
which one-dimensional channels run parallel to the inorganic backbone of the
structure is formed. There are so many studied on
usage of aluminium based metal organic framework in adsorption and gas
adsorption and separation processes. However, there is very limited number of
studies on catalytic properties of this material.

 

MIL-53(Al) provides several advantages compared with
other MOFs such as high thermal stability, cheap, and available raw materials.
It is also moisture resistant and has relatively high surface area which makes
it an attractive MOF alternative for catalytic processes. In this study,
aluminium salt was selected as metal precursor and MIL-53 (Al) was synthesized
by solvothermal method.

 

Then the synthesized material was sulfated to increase
the acidity. The characterization of synthesized and sulfated materials were
performed by FT-IR, BET, XRD and TGA methods. The catalytic activity of
sulfated material was tested in esterification reaction of acetic acid. The
effects of time, sulfation, temperature and alcohol type were investigated. 

Anahtar Kelimeler

MOF, MIL-53(Al), solvothermal, sulfation, and acidity

Kaynakça

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