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|1. (WO2018056849) METHOD OF PREPARING A LAYER OF ZIRCONIUM(IV) OXIDE AS A CATALYTIC CARRIER ON A METALLIC SUBSTRATE|
|Applicants:||POLITECHNIKA KRAKOWSKA IM. TADEUSZA KOŚCIUSZKI
JĘDRZEJCZYK, Roman J.
|Title:||METHOD OF PREPARING A LAYER OF ZIRCONIUM(IV) OXIDE AS A CATALYTIC CARRIER ON A METALLIC SUBSTRATE|
According to the invention, in the method of preparing a layer of zirconium(IV) oxide as a catalytic-carrier on an activated metallic substrate with oxide-layer formed thereon, a sol containing zirconium(IV) oxide is applied. The applied layer is dried and calcined. In the process of preparing of the sol as ZrO2-precursor zirconium(IV) n-propoxide is used and in addition glacial acetic acid, water and sol-stabilizers, such as glycols are used. The essence of the invention is that zirconium(IV) oxide contained in the sol applied onto a metallic substrate is the product of a process in which a solution of zirconium(IV) n-propoxide of a concentration 1 - 2.5 mol/dm3 dissolved in n-propanol with the addition of glacial acetic acid in an amount of 50 - 65 vol%. with respect to volume of solution of zirconium(IV) n-propoxide is exposed to activity of an ultrasonic field (ultrasounds) with a power of 60 - 100 W, and a frequency of 20 kHz at a temperature maintained between 10 °C and 60 °C. Small portions of deionized water in an amount of 10 - 15% vol. with respect to the total volume of the system are introduced to the solution. The water is introduced preferably 20 minutes after the initiation of the activity of the ultrasonic field. The ultrasound action is conducted for a time-period of 25 - 60 minutes in discontinuous mode in which intervals of ultrasonic action last for 1 to 5 minutes and downtimes between them last 1 to 3 minutes.