Hydroisomerization of n-dodecane on ZSM-48 with acid distribution modulation for high diffusion performance
In this paper, a one-dimensional ten-membered ring microporous molecular sieve ZSM-48 is employed as a model catalyst, with the number and positional distribution of acid sites in ZSM-48 molecular sieve adjusted by regulating the temperature of templating agent exfoliation. XRD, FT-IR, SEM, TG, NH3-...
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Elsevier
2025-07-01
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| Series: | Fuel Processing Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0378382025000414 |
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| author | Wei Zhang Jiangnan Xiang Yuting Wang Mengxi Ma Yan Wang Bo Qin Weijiong Dai Binbin Fan Jiajun Zheng Ruifeng Li |
| author_facet | Wei Zhang Jiangnan Xiang Yuting Wang Mengxi Ma Yan Wang Bo Qin Weijiong Dai Binbin Fan Jiajun Zheng Ruifeng Li |
| author_sort | Wei Zhang |
| collection | DOAJ |
| description | In this paper, a one-dimensional ten-membered ring microporous molecular sieve ZSM-48 is employed as a model catalyst, with the number and positional distribution of acid sites in ZSM-48 molecular sieve adjusted by regulating the temperature of templating agent exfoliation. XRD, FT-IR, SEM, TG, NH3-TPD, N2 adsorption-desorption, and the zero-length column (ZLC) method are used for characterization and analysis. The decrease in the distribution depth of acid sites within the microporous channels of ZSM-48 will not only significantly affects the hydroisomerization performance of n-dodecane (resulting in a final yield of isododecane of more than 80 %) but also influences the yield ratio of multi-branched and mono-branched isomers. After the conversion is stabilized, the yield ratio of multi-branched to mono-branched isomers for Z-48-350 is 1.4 to 2.1 times higher than that for Z-48-550. Furthermore, acid site distribution depth profoundly influences reactant diffusion, with Z-48-120 exhibiting a 115 % higher effective diffusion constant than Z-48-550 at 140 °C. Shortening the distribution depth of acid sites in the micropores does not significantly change the product distribution of n-dodecane monomethyl isomers but markedly suppresses the cracking reaction due to reduced diffusion limitation of olefinic intermediates. This enables efficient and selective hydroisomerization of long-chain n-alkanes. |
| format | Article |
| id | doaj-art-53a1cf18f4ae434e8a80a15c2bbec6af |
| institution | OA Journals |
| issn | 0378-3820 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Fuel Processing Technology |
| spelling | doaj-art-53a1cf18f4ae434e8a80a15c2bbec6af2025-08-20T02:13:33ZengElsevierFuel Processing Technology0378-38202025-07-0127210821710.1016/j.fuproc.2025.108217Hydroisomerization of n-dodecane on ZSM-48 with acid distribution modulation for high diffusion performanceWei Zhang0Jiangnan Xiang1Yuting Wang2Mengxi Ma3Yan Wang4Bo Qin5Weijiong Dai6Binbin Fan7Jiajun Zheng8Ruifeng Li9College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Corresponding authors.Sinopec Dalian (Fushun) Research Institute of Petroleum and Petrochemicals, Dalian 116045, China; Corresponding authors.College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Corresponding authors.In this paper, a one-dimensional ten-membered ring microporous molecular sieve ZSM-48 is employed as a model catalyst, with the number and positional distribution of acid sites in ZSM-48 molecular sieve adjusted by regulating the temperature of templating agent exfoliation. XRD, FT-IR, SEM, TG, NH3-TPD, N2 adsorption-desorption, and the zero-length column (ZLC) method are used for characterization and analysis. The decrease in the distribution depth of acid sites within the microporous channels of ZSM-48 will not only significantly affects the hydroisomerization performance of n-dodecane (resulting in a final yield of isododecane of more than 80 %) but also influences the yield ratio of multi-branched and mono-branched isomers. After the conversion is stabilized, the yield ratio of multi-branched to mono-branched isomers for Z-48-350 is 1.4 to 2.1 times higher than that for Z-48-550. Furthermore, acid site distribution depth profoundly influences reactant diffusion, with Z-48-120 exhibiting a 115 % higher effective diffusion constant than Z-48-550 at 140 °C. Shortening the distribution depth of acid sites in the micropores does not significantly change the product distribution of n-dodecane monomethyl isomers but markedly suppresses the cracking reaction due to reduced diffusion limitation of olefinic intermediates. This enables efficient and selective hydroisomerization of long-chain n-alkanes.http://www.sciencedirect.com/science/article/pii/S0378382025000414CatalystMolecular sievesZSM-48N-dodecaneHydroisomerization |
| spellingShingle | Wei Zhang Jiangnan Xiang Yuting Wang Mengxi Ma Yan Wang Bo Qin Weijiong Dai Binbin Fan Jiajun Zheng Ruifeng Li Hydroisomerization of n-dodecane on ZSM-48 with acid distribution modulation for high diffusion performance Fuel Processing Technology Catalyst Molecular sieves ZSM-48 N-dodecane Hydroisomerization |
| title | Hydroisomerization of n-dodecane on ZSM-48 with acid distribution modulation for high diffusion performance |
| title_full | Hydroisomerization of n-dodecane on ZSM-48 with acid distribution modulation for high diffusion performance |
| title_fullStr | Hydroisomerization of n-dodecane on ZSM-48 with acid distribution modulation for high diffusion performance |
| title_full_unstemmed | Hydroisomerization of n-dodecane on ZSM-48 with acid distribution modulation for high diffusion performance |
| title_short | Hydroisomerization of n-dodecane on ZSM-48 with acid distribution modulation for high diffusion performance |
| title_sort | hydroisomerization of n dodecane on zsm 48 with acid distribution modulation for high diffusion performance |
| topic | Catalyst Molecular sieves ZSM-48 N-dodecane Hydroisomerization |
| url | http://www.sciencedirect.com/science/article/pii/S0378382025000414 |
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