xmlui.ArtifactBrowser.SimpleSearch.filter.source:Scientific papers of the University of Pardubice. Series A, Faculty of Chemical Technology. 23/2017
ISSN:1211-5541
Abstract:
The Zn-Al hydrotalcites (materials with the layered structure) with constant molar
ratio of Zn/Al 2:1 were synthesized by co-precipitation method under different
reaction conditions, such as pH, the concentration of ions, temperature
throughout co-precipitation, the intensity of stirring, etc. The mixed oxides were
formed from hydrotalcites by calcination at 450 °C. All synthesized materials were
characterized by X-ray diffraction, thermogravimetric analysis, and via the
specific surface area. The influence of the synthesis conditions on the crystallite
size and specific surface area were studied. The formation of hydrotalcites as well
as mixed oxides was confirmed by X-ray diffraction. The mixed oxides chosen
were rehydrated, which enabled to restore their layered structure. Both mixed oxides and rehydrated (mixed) oxides were tested in the aldol condensation of
furfural, resulting in finding that the rehydration would decrease the conversion
of furfural when using all the rehydrated mixed oxides.
