Reconstruction of the ZnAl Mixed Oxides Into the Layered Double Hydroxide Catalysts Active in the Aldol Condensation of Furfural: The Role of ZnO Particles

Frontiers in Chemistry

Libor Čapek¹  Rostislav Daňhel¹  Vendula Meinhardová¹  Tomasz Kondratowicz¹  Lucie Smoláková¹  Lada Dubnová¹  Valeriia Korolova²  Oleg Kikhtyanin² 

[1] Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czechia;Technopark Kralupy VŠCHT Praha, University of Chemistry and Technology Prague, Prague, Czechia;

关键词: ZnAl reconstructed LDHs;    temperature programmed techniques;    in-situ DRS;    structural properties;    basic properties;    Na leaching;   

DOI  :  10.3389/fchem.2021.803764

来源: DOAJ

【 摘 要 】

A memory effect is the ability to restore the original, lamellar layered double hydroxide structure. Herein, we have described 1) the changes in the structural and basic properties of ZnAl mixed oxides during their transformation into ZnAl-reconstructed LDHs (RE-LDHs); 2) the extraordinary properties of ZnAl RE-LDHs compared to the original ZnAl LDHs; and 3) the changes of basic properties during the interaction of ZnAl RE-LDHs with atmospheric CO2. Aldol condensation was selected as probe reaction to prove the catalytic potential of ZnAl RE-LDHs. We have described a target method for preparing ZnAl RE-LDHs with a large number of basic sites. ZnAl RE-LDHs possess significantly higher furfural conversion in the aldol condensation of furfural than MOs. The structural, textural, and basic properties of the studied materials were described by temperature-programmed analysis, X-ray diffraction, N2 adsorption, temperature-programmed desorption of CO2, and in-situ diffuse reflectance spectroscopy.

【 授权许可】

Unknown