Selective synthesis of linear alkylbenzene by alkylation of benzene with 1-dodecene over desilicated zeolites

Aslam, Waqas; Siddiqui, M. Abdul Bari; Jermy, B. Rabindran; Aitani, Abdullah M.; Čejka, Jiřı́

doi:10.1016/j.cattod.2013.10.015

Cited by 38 publications

(27 citation statements)

References 38 publications

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“…Compared with the HZ5 catalyst, the number of Lewis acid sites increases after treatment of the catalysts with LiOH, NaOH, KOH, and CsOH, respectively (Table 2). It should be noted that Lewis acid sites are generated due to the formation of extraframework Al species, which is consistent with previous reports [49]. Notably, the ATHZ5-Na catalyst contains the highest amount of Brönsted acid sites, which can be attributed to the proper alkali treatment leading to higher Al content (i.e., a lower Si/Al ratio) [50].…”

Section: Pyridine Ft-ir Analysissupporting

confidence: 78%

Improvement of the Catalytic Efficiency of Butene Oligomerization Using Alkali Metal Hydroxide-Modified Hierarchical ZSM-5 Catalysts

Zhang

et al. 2018

Catalysts

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Oligomerization of light olefin is an effective method to produce plentiful liquid fuels. However, oligomerization processes using microporous zeolites have severe problems due to steric hindrance. In this paper, oligomerization of butene using a series of new types of hierarchical HZSM-5 zeolite catalysts is studied. To obtain the modified HZSM-5 catalysts, HZSM-5 is treated with the same concentration of LiOH, NaOH, KOH, and CsOH aqueous solutions, respectively. It is demonstrated that the alkali treatment can effectively modify the acidity properties and hierarchical structure of the HZSM-5 catalyst, which is confirmed by X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Nitrogen Adsorption-desorption Measurements, Transmission Electron Microscopy Investigations (TEM), Ammonia Temperature-programmed Desorption Method (NH 3 -TPD), Pyridine FT-IR, and Thermogravimetric Analysis (TGA). The results show that hierarchical catalysts with interconnected open-mesopores, smaller crystal size, and suitable acidity can better prolong the catalyst lifetime during butene oligomerization. Particularly, the HZSM-5 catalysts treated with CsOH aqueous solution (ATHZ5-Cs) proved to be the most effective catalyst, resulting in approximately 99% conversion of butene and exhibiting C 8 + selectivity of 85% within 12 h. Thus, an appropriate hierarchical catalyst can satisfy the oligomerization process and has the potential to be used as a substitute for the commercial ZSM-5 catalyst.

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Section: Pyridine Ft-ir Analysissupporting

confidence: 78%

Improvement of the Catalytic Efficiency of Butene Oligomerization Using Alkali Metal Hydroxide-Modified Hierarchical ZSM-5 Catalysts

Zhang

et al. 2018

Catalysts

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“…Lewis acids may be involved as catalysts for the conversion, in particular, of more basic molecules, such as "normal" n-bases [15], as well as of aromatics [16,17], which are Page 3 of 29 A c c e p t e d M a n u s c r i p t 3 stronger -bases than olefins. Lewis acidity of protonic zeolites in fact gives rise to an additional or different functionality for catalysis with respect to Brønsted acidity [18,19].…”

mentioning

confidence: 99%

On the Lewis acidity of protonic zeolites

Phung

Busca

2015

Applied Catalysis A: General

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IR spectra of hydroxyl groups, adsorbed CO, pivalonitrile and pyridine on three H-MFI zeolite samples and on two H-Y faujasites are reported and discussed. Samples richer in Al (H-MFI (Si/Al2 = 30) and H-Y (Si/Al2 = 5.1)) show the presence of extraframework species and the presence of Lewis acidity together with Brønsted acidity. H-MFI with lowest Al content (Si/Al2 = 280) does not show any extraframework species (EF) and only presents Brønsted acidity. H-MFI with intermediate Al content (Si/Al2 = 50) possess very small amount of EF species and of Lewis acidity. H-Y with low Al content (Si/Al2 = 30) does not show extraframework species but shows the presence of Lewis acidity together with Brønsted acidity. The role of extraframework material as carrier of Lewis acidity is confirmed. It is proposed that Lewis acidity of low Al-content H-Y can arise from framework tetrahedral Al ions, which can enlarge their coordination to five without any previous dehydroxylation. A support for this hypothesis is given by the reversible shift of the LF OH stretching band, whose extent depends on the strength of the basic molecules: this is certainly not due to a direct interaction of the OH groups responsible for the LF band, which are located in cavities (sodalite cavity and hexagonal prisms) where the molecular probes cannot access

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“…The authors performed the alkylation reaction using the benzene:1-alkene molecular ratio of 10:1 at temperatures ranging from 80°C to 160°C. It was shown that the composite material was less active than the dealuminated or desilicated mordenites [19,12]. The conversion of 1-dodecene was only 48% at the temperature of 120°C in the 120 min of reaction time.…”

Section: Introductionmentioning

confidence: 96%

“…These types of Friedel-Crafts catalysts are highly toxic, create a substantial amount of waste, and cause severe corrosion problems [6]. Based on the latter, a great effort is expended to replace these F-C catalysts by solid acid catalysts such as zeolites; for example, zeolite Y [7][8][9], beta zeolite [10,11], mordenites [12,13], heteropolyacids [14], clays [15] and ionic liquids [16] have been widely investigated for this reaction.…”

Section: Introductionmentioning

confidence: 99%

Positive effect of secondary structure creation in mordenites on alkylation of benzene with 1-tetradecene

Horňáček

Hudec

Velebná

et al. 2015

Catalysis Communications

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Selective synthesis of linear alkylbenzene by alkylation of benzene with 1-dodecene over desilicated zeolites

Cited by 38 publications

References 38 publications

Improvement of the Catalytic Efficiency of Butene Oligomerization Using Alkali Metal Hydroxide-Modified Hierarchical ZSM-5 Catalysts

Improvement of the Catalytic Efficiency of Butene Oligomerization Using Alkali Metal Hydroxide-Modified Hierarchical ZSM-5 Catalysts

On the Lewis acidity of protonic zeolites

Positive effect of secondary structure creation in mordenites on alkylation of benzene with 1-tetradecene

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