3 research outputs found
Zeolite-based photocatalysts immobilized on aluminum support by plasma electrolytic oxidation
The preparation and properties of zeolite-containing oxide coatings obtained
by plasma electrolytic oxidation are investigated and discussed. Pure and
Ce-exchanged natural (clinoptilolite) and synthetic (13X) zeolites are
immobilized on aluminum support from silicate-based electrolyte. Obtained
coatings are characterized with respect to their morphology, phase and chemical
composition, photocatalytic activity and anti-corrosion properties. It is
observed that all mentioned properties of obtained coatings are dependent on
processing time and type of immobilized zeolite. Coatings with Ce-exchanged
zeolite show higher photocatalytic activity and more effective corrosion
protection than those with pure zeolite. The highest photocatalytic activity is
observed for coatings processed in pulsed a DC regime for 30 minutes containing
Ce-exchanged 13X zeolite, followed by those containing Ce-exchanged
clinoptilolite. Pronounced anti-corrosion properties feature almost all samples
containing Ce-exchanged 13X zeolite
Properties of ZnO/ZnAlO composite PEO coatings on zinc
Recently the successful formation of PEO coatings on zinc in a phosphate
aluminate electrolyte was shown. The produced composite coatings contain
various mixtures of ZnO and ZnAlO. In frame of the current study, the
properties of the formed coatings including adhesion/cohesion, wear, corrosion
and photocatalytic activity were analysed to identify possible applications.
However, the coatings show internal porosity and a sponge-like structure. Thus
the cohesion within the coating is quite low. Pull-off tests have demonstrated
clear rupture within the PEO layer at strength values as low as 1 MPa. The
photocatalytic activity is limited, in spite of the formation of a higher
amount of ZnO at shorter treatment times. Interestingly, the composite coatings
of ZnO and higher amounts of ZnAlO spinel showed a higher activity, but
not sufficient for fast and effective catalytic cleaning applications
Complementary approach to the adsorption of CO and N2O on bimetallic ion exchanged ZMS-5 zeolite: Microcalorimetric and FTIR spectroscopy study
SSCI-VIDE+ATARI+AAUInternational audienceNitrous oxid