Effect of Si/Al ratio of high-silica HZSM-5 catalysts on the prins condensation of isobutylene and formaldehyde to isoprene

Yu, Xuebin; Liu, Bing; Zhang, Yuewei

doi:10.1016/j.heliyon.2019.e01640

Cited by 11 publications

(8 citation statements)

References 25 publications

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“…In a recent study, Yu et al [43] reported similar conclusions. For a series of H-ZSM-5 zeolites, they found that the Si/Al ratio had a crucial impact on zeolite acidity and catalytic performance in isoprene synthesis.…”

Section: Prins Condensantionmentioning

confidence: 56%

“…More recently, Ivanova and coworkers studied this reaction in the presence of H-ZSM-5, H-Beta, H-Y, Zr-Beta, Sn-Beta, and Nb-Beta catalysts [41,42]. Yu et al [43] and Zhu et al [44] used a series of HZSM-5 catalysts with different Si/Al ratio. Vasiliadou et al [45] also used H-ZSM-5 catalysts with various Si/Al ratio, but in a liquid phase process.…”

Section: Prins Condensantionmentioning

confidence: 99%

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Zeolite-based catalysis for isobutene conversion into chemicals and fuel additives. A review

Hulea¹

2022

Comptes Rendus. Chimie

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Isobutene (IB), the most reactive molecule in the C4 raffinate, is a raw material of great industrial significance. It is extensively used in the manufacturing process of rubber, fuel additives, fine chemicals, agricultural chemicals, plastics and antioxidants. Heterogeneous catalysts and particularly zeolites are playing a major role in these applications. The aim of this review is to examine the relevant processes involving IB as reagent and zeolites as acid catalysts. The following reactions are successively covered: Prins condensation, IB dimerization, IB-methanol/ethanol etherification, IB-glycerol etherification, IB amination, and phenol tert-butylation. While reasonably comprehensive and broad, the present survey is not necessarily exhaustive. The mechanistic aspects of the titled reactions, the role of zeolite catalysts and their topology/active sites on the product selectivity are mainly explored.

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Section: Prins Condensantionmentioning

confidence: 56%

Section: Prins Condensantionmentioning

confidence: 99%

Zeolite-based catalysis for isobutene conversion into chemicals and fuel additives. A review

Hulea¹

2022

Comptes Rendus. Chimie

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“…The relative amounts of weak and medium-strong sites were estimated using method of Katada et al [26]. Independently of the sol-gel route, the amount of desor NH3 roughly increased with the Al loading (up to 75 wt% for HSG samples), as repo previously for Ni-Si-Al catalysts prepared via NHSG [17] and silica-alumina mate prepared via HSG [28]. The relative amounts of weak and medium-strong sites were estimated using the method of Katada et al [26].…”

Section: Synthesis and Characterization Of Materialsmentioning

confidence: 63%

Hydrolytic vs. Nonhydrolytic Sol-Gel in Preparation of Mixed Oxide Silica–Alumina Catalysts for Esterification

et al. 2022

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The development of green and sustainable materials for use as heterogeneous catalysts is a growing area of research in chemistry. In this paper, mesoporous SiO2-Al2O3 mixed oxide catalysts with different Si/Al ratios were prepared via hydrolytic (HSG) and nonhydrolytic sol-gel (NHSG) processes. The HSG route was explored in acidic and basic media, while NHSG was investigated in the presence of diisopropylether as an oxygen donor. The obtained materials were characterized using EDX, N2-physisorption, powder XRD, 29Si, 27Al MAS-NMR, and NH3-TPD. This approach offered good control of composition and the Si/Al ratio was found to influence both the texture and the acidity of the mesoporous materials. According to 27Al and 29Si MAS NMR analyses, silicon and aluminum were more regularly distributed in NHSG samples that were also more acidic. Silica–alumina catalysts prepared via NHSG were more active in esterification of acetic acid with n-BuOH.

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“…Numerous studies have been performed to evaluate the performance of liquid and solid acid catalysts in the Prins condensation between FA and MTBE. In the gas–solid reaction operated in a fixed-bed reactor, zeolite, − supported phosphate, − metal oxide, and supported HPA catalysts , have been studied extensively. As a result of the high working temperature, the catalysts suffer quick deactivation due to the formation of coke.…”

Section: Introductionmentioning

confidence: 99%

Sulfonic Acid-Functionalized Brønsted Ionic Liquid-Catalyzed Isoprene Production via Prins Condensation between Methyl Tert-Butyl Ether and Formaldehyde in Their Stoichiometric Ratio

Gao

Zhou

et al. 2022

Ind. Eng. Chem. Res.

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Prins condensation of methyl tert-butyl ether (MTBE) with formaldehyde (FA) is an important route for isoprene synthesis. Traditionally, the production capacity of isoprene in a liquid-phase batch reactor is significantly limited due to the high ratio of MTBE/FA and the addition of an excessive amount of solvent. In this study, we evaluated different acid catalysts aiming at enhancing the selectivity and recyclability of catalysts under the condition of stoichiometric MTBE/FA in a concentrated solution. A Brønsted sulfonic ionic liquid ([HSO 3bmin] PTS) showed remarkable performance. The study of the reaction network confirmed that 4,4-dimethyl-1,3-dioxane (DMD) was the key reaction intermediate for isoprene synthesis. Sufficient acid strength of the ionic liquid catalysts was necessary for the conversion of intermediates to isoprene. The influence of reaction conditions including reaction time, reaction temperature, solvent, SO 3 H-functionalized ionic liquid (SFIL) concentration, and the amount of MTBE and formaldehyde was investigated in detail to maximize the yield of isoprene. Under the optimal conditions, the capacity of isoprene production reached 55.0 g/L, 1 order higher than that in previous studies. The [HSO 3 -bmin] PTS ionic liquid exhibited excellent recyclability and maintained its activity and selectivity after being reused seven times.

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Effect of Si/Al ratio of high-silica HZSM-5 catalysts on the prins condensation of isobutylene and formaldehyde to isoprene

Cited by 11 publications

References 25 publications

Zeolite-based catalysis for isobutene conversion into chemicals and fuel additives. A review

Zeolite-based catalysis for isobutene conversion into chemicals and fuel additives. A review

Hydrolytic vs. Nonhydrolytic Sol-Gel in Preparation of Mixed Oxide Silica–Alumina Catalysts for Esterification

Sulfonic Acid-Functionalized Brønsted Ionic Liquid-Catalyzed Isoprene Production via Prins Condensation between Methyl Tert-Butyl Ether and Formaldehyde in Their Stoichiometric Ratio

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