期刊
APPLIED CATALYSIS A-GENERAL
卷 471, 期 -, 页码 91-97出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2013.11.039
关键词
UiO-66; Electronic effect; Acid-base properties; Acetalization
资金
- SB RAS project [V.44.2.12]
- Federal Program Scientific and Educational Cadres of Russia [2012-1.2.1-12-000-1004, 2012-1.5-12-000-1013-002]
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education [2012R1A1A2004528]
A family of isoreticular metal-organic frameworks (MOFs), based on the UiO-66 structure, were synthesized from the two linker ligands containing electron-donating NH2-groups (2-amino-benzenedicarboxylic acid (H2N-H2BDC)) and electron-withdrawing NO2-groups (2-nitrobenzenedicarboxylic acid (O2N-H2BDC)). The catalytic performance of these materials was investigated with a combination of physicochemical and catalytic approaches in acetalization of benzaldehyde with methanol. The investigation of basicity and Lewis acidity was done by IR spectroscopy using CDCl3 and 5-nonanone as probe molecules, respectively. The combination of physicochemical and catalytic investigations demonstrates that acid-base and catalytic properties of these materials depend on amount and type of functional groups presented in the linker units. Insertion of electron-donating NH2-groups into linker ligand leads to increase in the strength of basic sites in contrast to electron-withdrawing NO2-groups. The strength of Lewis acid sites decreases in order of UiO-66-NO2 > UiO-66 > UiO-66-NH2, that leads to the decrease in their catalytic activity in acetalization of benzaldehyde with methanol in the same order. (C) 2013 Elsevier B.V. All rights reserved.
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