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Selective synthesis of linear alkylbenzene by alkylation of benzene with 1-dodecene over desilicated zeolites
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SYSNO ASEP 0427874 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Selective synthesis of linear alkylbenzene by alkylation of benzene with 1-dodecene over desilicated zeolites Author(s) Aslam, W. (SA)
Siddiqui, M. A. B. (SA)
Jermy, B. R. (SA)
Aitani, A. (SA)
Čejka, Jiří (UFCH-W) RID, ORCID, SAI
Al-Khattaf, S. (SA)Source Title Catalysis Today. - : Elsevier - ISSN 0920-5861
Roč. 227, MAY 2014 (2014), s. 187-197Number of pages 11 s. Language eng - English Country NL - Netherlands Keywords zeolites ; benzene alkylation ; long-chain olefin Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GBP106/12/G015 GA ČR - Czech Science Foundation (CSF) Institutional support UFCH-W - RVO:61388955 UT WOS 000332412900026 EID SCOPUS 84895479844 DOI 10.1016/j.cattod.2013.10.015 Annotation The alkylation of benzene with 1-dodecene to linear alkylbenzenes (LAB) was investigated over 12-ring zeolites MOR, BEA, and FAU with varying framework topologies and Si/Alratios. The reaction was carried out under a high-pressure, 20 bar, in a fixed-bed flow reactor at 140 degrees C, using WHSV 4 h-1, benzene/1 dodecene molar ratio of 6.0 and time-on-stream of 6.0 h. In contrast to MOR and BEA zeolites, FAU exhibited the lowest selectivity (24%) to the desired 2-phenyl dodecane (2-LAB) due to its large cavities. The MOR and BEA with different Si/Alratios were further desilicated using alkali-metal treatments (0.2 M and 0.05 M NaOH) to create hierarchical porous structure. The desilication of both zeolites improved the conversion of 1-dodecene and the selectivity to 2-LAB. The excellent stability resulting from desilication is attributed to a better diffusivity of the LAB isomers, shortening of real contact time, due to the enhanced mesporous structure in both zeolites and the higher Lewis acidity. The selectivity to 2-LAB increased to 70% over desilicated MOR (Si/Al ratio = 20) compared with a selectivity of 35% over desilicated BEA (Si/Al ratio = 24). Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2015
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