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https://open.uns.ac.rs/handle/123456789/15034
Nаziv: | Precursor type affecting surface properties and catalytic activity of sulfated zirconia | Аutоri: | Zarubica, Aleksandra Bošković, Goran |
Dаtum izdаvаnjа: | 1-дец-2007 | Čаsоpis: | Acta Periodica Technologica | Sažetak: | Zirconium-hydroxide precursor samples are synthesized from Zr-hydroxide, Zr-nitrate, and Zr-alkoxide, by precipitation/impregnation, as well as by a modified sol-gel method. Precursor samples are further sulphated for the intended SO42- content of 4 wt.%, and calcined at 500-700°C. Differences in precursors' origin and calcination temperature induce the incorporation of SO42- groups into ZrO2 matrices by various mechanisms. As a result, different amounts of residual sulphates are coupled with other structural, as well as surface properties, resulting in various catalytic activities of sulphated zirconia samples. Catalyst activity and selectivity are a complex synergistic function of tetragonal phase fraction, sulphates contents, textural and surface characteristics. Superior activity of SZ of alkoxide origin can be explained by a beneficial effect of meso-pores owing to a better accommodation ofcoke deposits. | URI: | https://open.uns.ac.rs/handle/123456789/15034 | ISSN: | 14507188 | DOI: | 10.2298/APT0738105Z |
Nаlаzi sе u kоlеkciјаmа: | TF Publikacije/Publications |
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