Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane
Authors
Zarubica, AleksandraKrstić, Jugoslav
Popović, Dejan
Krstić, Aleksandra
Ljupković, Radomir
Ranđelović, Marjan
Matović, Branko
Article (Published version)
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New binary catalytic systems based on sulphated zirconia-alumina were synthesized by controlled hydrolysis of alkoxides using relative molar ratios of constituents 1:1, 1:2 and 1:3 in favour of zirconia. The obtained differences in the final catalytic material’s properties may be related to organic precursor memory effect, the applied calcinations temperatures and used alumina contents. The addition of alumina to zirconia affected the structural and surface properties stabilizing bare zirconia by means of slower phase transformation of tetragonal zirconia crystal phase into monoclinic one, further resulting in smaller crystallites sizes and higher surface density of acidic function (sulphates). The best alumina impact on physico-chemical properties was achieved when the highest amount of alumina (e.g. 50%) and lower calcination temperature (500°C) were used, causing relatively high steady-state activity in isomerization of n-hexane at reaction temperature 250 °C. On the other hand, hig...her calcination temperature (600 °C) played a role in the genesis of greater sulphate density. Catalytic activity and selectivity are expressed as a complex synergistic function of relative density of acid sites together with positive status of other optimized physico-chemical properties of the catalytic material (by activation and calcination temperatures).
Keywords:
zirconia / alumina / sol-gel processes / catalytic properties / nanostructuresSource:
Processing and Application of Ceramics, 2021, 15, 2, 136-Publisher:
- Novi Sad : University of Novi Sad, Faculty of Technology
Funding / projects:
- Synthesis, processing and characterization of nanostructured materials for application in the field of energy, mechanical engineering, environmental protection and biomedicine (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45012)
- Development and characterization of novel biosorbent for natural and waste water treatment (RS-MESTD-Technological Development (TD or TR)-34008)
- The project of Serbian Academy of Sciences and Arts
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IHTMTY - JOUR AU - Zarubica, Aleksandra AU - Krstić, Jugoslav AU - Popović, Dejan AU - Krstić, Aleksandra AU - Ljupković, Radomir AU - Ranđelović, Marjan AU - Matović, Branko PY - 2021 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/4802 AB - New binary catalytic systems based on sulphated zirconia-alumina were synthesized by controlled hydrolysis of alkoxides using relative molar ratios of constituents 1:1, 1:2 and 1:3 in favour of zirconia. The obtained differences in the final catalytic material’s properties may be related to organic precursor memory effect, the applied calcinations temperatures and used alumina contents. The addition of alumina to zirconia affected the structural and surface properties stabilizing bare zirconia by means of slower phase transformation of tetragonal zirconia crystal phase into monoclinic one, further resulting in smaller crystallites sizes and higher surface density of acidic function (sulphates). The best alumina impact on physico-chemical properties was achieved when the highest amount of alumina (e.g. 50%) and lower calcination temperature (500°C) were used, causing relatively high steady-state activity in isomerization of n-hexane at reaction temperature 250 °C. On the other hand, higher calcination temperature (600 °C) played a role in the genesis of greater sulphate density. Catalytic activity and selectivity are expressed as a complex synergistic function of relative density of acid sites together with positive status of other optimized physico-chemical properties of the catalytic material (by activation and calcination temperatures). PB - Novi Sad : University of Novi Sad, Faculty of Technology T2 - Processing and Application of Ceramics T1 - Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane VL - 15 IS - 2 SP - 136 DO - 10.2298/PAC2102111Z ER -
@article{ author = "Zarubica, Aleksandra and Krstić, Jugoslav and Popović, Dejan and Krstić, Aleksandra and Ljupković, Radomir and Ranđelović, Marjan and Matović, Branko", year = "2021", abstract = "New binary catalytic systems based on sulphated zirconia-alumina were synthesized by controlled hydrolysis of alkoxides using relative molar ratios of constituents 1:1, 1:2 and 1:3 in favour of zirconia. The obtained differences in the final catalytic material’s properties may be related to organic precursor memory effect, the applied calcinations temperatures and used alumina contents. The addition of alumina to zirconia affected the structural and surface properties stabilizing bare zirconia by means of slower phase transformation of tetragonal zirconia crystal phase into monoclinic one, further resulting in smaller crystallites sizes and higher surface density of acidic function (sulphates). The best alumina impact on physico-chemical properties was achieved when the highest amount of alumina (e.g. 50%) and lower calcination temperature (500°C) were used, causing relatively high steady-state activity in isomerization of n-hexane at reaction temperature 250 °C. On the other hand, higher calcination temperature (600 °C) played a role in the genesis of greater sulphate density. Catalytic activity and selectivity are expressed as a complex synergistic function of relative density of acid sites together with positive status of other optimized physico-chemical properties of the catalytic material (by activation and calcination temperatures).", publisher = "Novi Sad : University of Novi Sad, Faculty of Technology", journal = "Processing and Application of Ceramics", title = "Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane", volume = "15", number = "2", pages = "136", doi = "10.2298/PAC2102111Z" }
Zarubica, A., Krstić, J., Popović, D., Krstić, A., Ljupković, R., Ranđelović, M.,& Matović, B.. (2021). Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane. in Processing and Application of Ceramics Novi Sad : University of Novi Sad, Faculty of Technology., 15(2), 136. https://doi.org/10.2298/PAC2102111Z
Zarubica A, Krstić J, Popović D, Krstić A, Ljupković R, Ranđelović M, Matović B. Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane. in Processing and Application of Ceramics. 2021;15(2):136. doi:10.2298/PAC2102111Z .
Zarubica, Aleksandra, Krstić, Jugoslav, Popović, Dejan, Krstić, Aleksandra, Ljupković, Radomir, Ranđelović, Marjan, Matović, Branko, "Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane" in Processing and Application of Ceramics, 15, no. 2 (2021):136, https://doi.org/10.2298/PAC2102111Z . .