2 октомври 2020
Ilieva, L., Ivanov, I., Petrova, P., Munteanu, G., Karakirova, Y., Sobczak, J.W., Lisowski, W., Anghel, E.M., Kaszkur, Z., Tabakova, T..
(
Иван Иванов;
Йорданка Каракирова;
Татяна Табакова;
)
Abstract
CuO/ceria and CuO/Y-doped ceria catalysts were synthesized. The Y-modified supports (1.0, 2.5 and 5.0 wt% Y2O3) were prepared by coprecipitation. CuO (3 wt% Cu) was loaded by deposition-precipitation. Having in mind the known effect of Y3+ modification for the generation of oxygen vacancies in ceria, its positive role on the water-gas shift (WGS) performance was expected. However, the catalytic test showed a trend of decreased WGS activity by increasing the Y-dopant amount, nevertheless that the differences were not very substantial. On the basis of XRD, XPS, EPR, Raman spectroscopy and H2-TPR results the explanation related to the key role of the oxygen mobility influenced by Y-doping could be proposed. The reason of the inferior WGS performance with increasing Y-content would be the higher amount of surface oxygen vacancies around Y3+ ions which disturbed the Cu–Ovac–Ce active sites for WGS reaction. Though, during the long run catalytic tests in WGS reaction a positive effect of Y-doping for improved stability of CuO/ceria catalysts was evidenced.
International Journal of Hydrogen Energy, 45, 49, Elsevier B.V., 2020, DOI:10.1016/j.ijhydene.2019.10.190, 26286-26299. SJR (Scopus):1.14, JCR-IF (Web of Science):4.939 Q1, не оглавява ранглистата (Scopus)
https://doi.org/10.1016/j.ijhydene.2019.10.190
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