Towards acid MOFs – catalytic performance of sulfonic acid functionalized architectures

Towards acid MOFs – catalytic performance of sulfonic acid functionalized architectures

Juan-Alcaniz, J.
Gielisse, R.
Lago, A.B.
Ramos-Fernandez, E.V.
Serra-Crespo, P.
Devic, T.
Guillou, N.
Serre, C.
Kapteijn, F.
Gascon, J.

Applied Sciences

Chemical Engineering

2013-07-03

In this work, the inclusion of free sulfonic acid groups in highly stable MOFs is explored. The synthesized catalysts have been applied in a model esterification reaction. Two metal organic frameworks bearing sulfonic acid moieties are investigated: HSO3-MIL-101(Cr) synthesized following different approaches and a new structure based on HSO3-bdc and Zr. The acidic properties, catalytic performance, deactivation and stability of the different structures are critically evaluated. In the case of MIL-101(Cr), deactivation of the sulfonic groups via formation of butanol sulfonic esters has been observed. Due to the strong interaction between –SO3 _ and the Cr open metal site where usually fluorine (F_) is located in the structure, the HSO3-MIL-101(Cr) catalysts are not stable under acidic regeneration conditions. When using Zr as a metal node, a new and stable sulfonic acid containing porous structure was synthesized. This structure showed high activity and full re-usability in the esterification of n-butanol with acetic acid. In this case, deactivation of the catalyst due to sulfonic ester formation could be reversed by reactivation under acidic conditions.

Gold for Gold
Open Access

http://resolver.tudelft.nl/uuid:b4dba21a-1dac-473c-9429-3226c7472afb

https://doi.org/10.1039/c3cy00272a

RSC Publishing

2044-4753

Catalysis Science & Technology, 2013, 3

Institutional Repository

journal article

(c) 2013 RSC