Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane
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...
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University of Novi Sad
2021-06-01
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| Series: | Processing and Application of Ceramics |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/1820-6131/2021/1820-61312102111Z.pdf |
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| author | Zarubica Aleksandra Krstić Jugoslav B. Popović Dejan Krstić Aleksandra Ljupković Radomir Ranđelović Marjan Matović Branko |
| author_facet | Zarubica Aleksandra Krstić Jugoslav B. Popović Dejan Krstić Aleksandra Ljupković Radomir Ranđelović Marjan Matović Branko |
| author_sort | Zarubica Aleksandra |
| collection | DOAJ |
| description | 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). |
| first_indexed | 2024-12-13T21:42:07Z |
| format | Article |
| id | doaj.art-bbcd567f85cb42edba40676f7825675b |
| institution | Directory Open Access Journal |
| issn | 1820-6131 2406-1034 |
| language | English |
| last_indexed | 2024-12-13T21:42:07Z |
| publishDate | 2021-06-01 |
| publisher | University of Novi Sad |
| record_format | Article |
| series | Processing and Application of Ceramics |
| spelling | doaj.art-bbcd567f85cb42edba40676f7825675b2022-12-21T23:30:31ZengUniversity of Novi SadProcessing and Application of Ceramics1820-61312406-10342021-06-0115211111910.2298/PAC2102111ZInfluence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexaneZarubica Aleksandra0Krstić Jugoslav B.1https://orcid.org/0000-0003-0321-0698Popović Dejan2Krstić Aleksandra3Ljupković Radomir4https://orcid.org/0000-0002-5828-1816Ranđelović Marjan5Matović Branko6https://orcid.org/0000-0001-8022-1863Faculty of Science and Mathematics, University of Niš, Niš, SerbiaInstitute of Chemistry, Technology and Metallurgy, University of Belgrade, Belgrade, SerbiaFaculty of Medicine, University of Niš, Niš, SerbiaFaculty of Science and Mathematics, University of Niš, Niš, SerbiaFaculty of Science and Mathematics, University of Niš, Niš, SerbiaFaculty of Science and Mathematics, University of Niš, Niš, SerbiaInstitute of Nuclear Science Vinča, University of Belgrade, Belgrade, SerbiaNew 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).http://www.doiserbia.nb.rs/img/doi/1820-6131/2021/1820-61312102111Z.pdfzirconiaaluminasol-gel processescatalytic propertiesnanostructures |
| spellingShingle | Zarubica Aleksandra Krstić Jugoslav B. 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 Processing and Application of Ceramics zirconia alumina sol-gel processes catalytic properties nanostructures |
| title | Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane |
| title_full | Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane |
| title_fullStr | Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane |
| title_full_unstemmed | Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane |
| title_short | Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane |
| title_sort | influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n hexane |
| topic | zirconia alumina sol-gel processes catalytic properties nanostructures |
| url | http://www.doiserbia.nb.rs/img/doi/1820-6131/2021/1820-61312102111Z.pdf |
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