Friedel-Crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology

Martins, Ângela; Neves, Vera; Moutinho, João P.; Nunes, Nélson; Carvalho, Ana P.

doi:10.1016/j.micromeso.2021.111167

Cited by 18 publications

(14 citation statements)

References 25 publications

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“…As reported elsewhere, 47 , 48 both accessibility and strong acidity are needed in the heterogeneous catalytic transformation of fine chemicals, as large substrates and/or intermediate products are usually involved and the reaction typically takes place in liquid phase. 49 − 51 Consequently, conventional zeolites (FAU and BEA) and the amorphous mesoporous solid (Al–MCM-41) display the lowest catalytic activity ( Figure 4 and Figure S7 ).…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Catalysts Prepared by Interzeolite Transformation

et al. 2022

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Interzeolite transformation has been used to produce a novel family of hierarchical catalysts featuring excellent textural properties, strong acidity, and superior catalytic performance for the Friedel–Crafts alkylation of indole with benzhydrol, the Claisen–Schmidt condensation of benzaldehyde and hydroxyacetophenone, and the cracking of polystyrene. Intermediate solids of the FAU interzeolite transformation into BEA display both increased accessibility—due to the development of mesoporosity—and strong acidity—caused by the presence of ultrasmall crystals or zeolitic fragments in their structure. The use of surfactants allows for the development of the hierarchical catalysts with very narrow pore size distribution. The properties of interzeolite transformation intermediates (ITIs) can be fine-tuned simply by stopping the interconversion at different times.

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Section: Resultsmentioning

confidence: 99%

Hierarchical Catalysts Prepared by Interzeolite Transformation

et al. 2022

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“…It is known that a broad variety of reactions can be carried out in an aqueous environment with the help of surfactants, which were used to modify liquid–liquid two‐phase system to enhance the mass transport and reactant solubility in one of the two phases, such as the acylation reaction, 49 the Heck reaction, 50 the electrocatalytic dichlorination, 51 and the hydrolysis reaction 52 . The moderate mixture of water, oil and surfactant forms microemulsion, which solubilizes oil as well as water.…”

Section: Resultsmentioning

confidence: 99%

Towards more efficient hydroformylation of long‐chain alkenes in aqueous biphasic system using microbubbles

Ruan

Jiang

Zhang

et al. 2022

Asia-Pacific J Chem Eng

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Microbubbles were applied for the first time to enhance the aqueous biphasic hydroformylation of long-chain alkenes. The gas-liquid-liquid multiphase hydroformylation was carried out using 1-dodecene as model higher olefin and dihexadecyl dimethyl ammonium bromide (DDAB) as surfactant. The increasing liquid temperature resulted in the increased mean bubble size and total bubble number, but this trend became inapparent at high temperatures due to the reduced liquid viscosity. The increasing gas flow rate was favorable to increase the multiphase interfacial area, thus leading to the increasing mass transfer coefficient K L a. The conversion of 1-dodecene reached maximum 95% in the three-phase microemulsion system, and at a gas flow rate of 40 ml min À1 . Further increasing the gas flow rate to 80 ml min À1 decreased the conversion, which was attributed to the destroyed flow field, as observed in micro-PIV. Owing to the increased multiphase mass transfer efficiency, the application of microbubbles allowed to intensify the hydroformylation reaction with reduced reaction pressure, higher chemoselectivity, and increased turnover frequency (TOF).

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“…The resulting material presented, not only a higher mesoporosity, but its mesopore size distribution was more uniform, keeping the crystal size and morphology intact (see Figure 10). The same strategy has been applied to other zeolite structures, such as MOR [100], BEA, MFI, and LTA [101], as well as the exploration of other surfactants and bases [100,102,103]. Recently, Mendoza-Castro et al [97] critically reviewed the surfactant-templated methodology, from the optimization of experimental parameters to the extension of this methodology to a large number of zeolite structures, focusing on their use for industrial purposes.…”

Section: Surfactant-templated Zeolitesmentioning

confidence: 99%

Zeolites and Related Materials as Catalyst Supports for Hydrocarbon Oxidation Reactions

et al. 2022

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Catalytic oxidation is a key technology for the conversion of petroleum-based feedstocks into useful chemicals (e.g., adipic acid, caprolactam, glycols, acrylates, and vinyl acetate) since this chemical transformation is always involved in synthesis processes. Millions of tons of these compounds are annually produced worldwide and find applications in all areas of chemical industries, ranging from pharmaceutical to large-scale commodities. The traditional industrial methods to produce large amounts of those compounds involve over-stoichiometric quantities of toxic inorganic reactants and homogeneous catalysts that operate at high temperature, originating large amounts of effluents, often leading to expensive downstream processes, along with nonrecovery of valuable catalysts that are loss within the reactant effluent. Due to the increasingly stringent environmental legislation nowadays, there is considerable pressure to replace these antiquate technologies, focusing on heterogeneous catalysts that can operate under mild reactions conditions, easily recovered, and reused. Parallelly, recent advances in the synthesis and characterization of metal complexes and metal clusters on support surfaces have brought new insights to catalysis and highlight ways to systematic catalysts design. This review aims to provide a comprehensive bibliographic examination over the last 10 years on the development of heterogeneous catalysts, i.e., organometallic complexes or metal clusters immobilized in distinct inorganic supports such as zeolites, hierarchical zeolites, silicas, and clays. The methodologies used to prepare and/or modify the supports are critically reviewed, as well as the methods used for the immobilization of the active species. The applications of the heterogenized catalysts are presented, and some case-studies are discussed in detail.

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Friedel-Crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology

Cited by 18 publications

References 25 publications

Hierarchical Catalysts Prepared by Interzeolite Transformation

Hierarchical Catalysts Prepared by Interzeolite Transformation

Towards more efficient hydroformylation of long‐chain alkenes in aqueous biphasic system using microbubbles

Zeolites and Related Materials as Catalyst Supports for Hydrocarbon Oxidation Reactions

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