A comparative study of n-hexane isomerization over solid acids catalysts: Sulfated and phosphated zirconia
| Autor: | M. Randjelovic, Nikola Stojkovic, M. Vasic, P. Putanov, M. Marinkovic, Milovan M. Purenović, A. Zarubica |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
sulfated zirconia
General Chemical Engineering Inorganic chemistry Thermal treatment 010402 general chemistry 01 natural sciences Catalysis law.invention chemistry.chemical_compound law isomerization of n-hexane phosphated zirconia Cubic zirconia Calcination Texture (crystalline) lcsh:Chemical engineering lcsh:HD9650-9663 010405 organic chemistry Chemistry lcsh:TP155-156 0104 chemical sciences Hexane Mesoporous material Isomerization lcsh:Chemical industries catalyst |
| Zdroj: | Chemical Industry and Chemical Engineering Quarterly / CICEQ (2012) 18(2):209-220 Chemical Industry and Chemical Engineering Quarterly, Vol 18, Iss 2, Pp 209-220 (2012) |
| ISSN: | 2217-7434 1451-9372 |
| DOI: | 10.2298/ciceq110602062s |
| Popis: | Two series of zirconia based catalysts promoted with either sulfates or phosphates were prepared, calcined at different temperatures (600 and 700?C) and evaluated for the n-hexane isomerization reaction. The catalysts with different concentrations of sulfates or phosphates (4 or 10 wt. %) were characterized by BET, XRD, SEM methods, and total acidity was evaluated by using the Hammett indicators. Their final catalytic performances were correlated with their physical-chemical properties (surface, structural, textural and morphological). It was found that sulfated zirconia catalyst calcined at lower temperature showed the highest initial activity of all tested catalysts as the result of favorable total acidity, mesopore texture and structural properties. Somewhat lower activity of the sulfated catalyst calcined at higher temperature is related to the content of acid groups partially removed during thermal treatment, thus, lower total acidity, and also to less favorable textural and structural features. Negligible activity of phosphated zirconia catalysts is connected with low total acidity despite the positive status of particular property showing the complexity of the active phase/site formation in the catalyst. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|