MWW-Type Zeolites: MCM-22, MCM-36, MCM-49, and MCM-56 (A Review)

Остроумова, В. А.; Максимов, А. Л.

doi:10.1134/s0965544119080140

Cited by 30 publications

(12 citation statements)

References 89 publications

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“…The XRD patterns contained reflections characteristic for MWW zeolites at 7.2° 2θ (hkl 100), ca. 25 and 26° 2θ (220, 310) as well as a wide peak between 8° and 10° 2θ (related to 101 and 102), without the dip indicating spatially disorganized layers [30,40,41]. The quality of the parent MWW and the layers precipitated from the colloid (MWW_coll) seem to be comparable, as indicated by a similar overall intensity of the XRD pattern and absent valley at 8°-10° 2θ as evidence of disordered layers.…”

Section: Resultsmentioning

confidence: 83%

The effect of amorphous silica support on the catalytic activity of liquid-exfoliated monolayered MCM-56 zeolite

Ogorzały

Jajko²,

Korzeniowska³

et al. 2023

J Porous Mater

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Recently reported groundbreaking discovery of efficient delamination of zeolite MCM-56, producing colloidal suspensions of MWW monolayers dispersed in the liquid phase, created unprecedented possibilities for the synthesis of a zeolite catalyst. Based on this innovation, the concept of using MWW monolayers to prepare silica-supported zeolite nanosheet catalysts suitable for transformations of large organic molecules was explored in this work. A series of silica-MWW preparations was synthesized from colloidal suspensions of the monolayers, using both solid and colloidal silica sources. The synthesized solids were thoroughly characterized with various physicochemical methods and their catalytic performance was tested in alkylation of mesitylene with benzyl alcohol. The obtained results indicate that solids containing MWW layers dispersed on silica show promising catalytic properties. The mixed MWW:silica catalysts synthesized from dispersions of MWW monolayers and liquid silica were found to exhibit high specific catalytic activity (with TOF values of 3.4 × 10−3 to 4.8 × 10−3 s−1), despite the high content of inactive amorphous silica support (40–60%). Materials synthesized from solid fumed and precipitated silicas showed low or negligible overall activity, which could be attributed to the small incorporation of the zeolitic active phase. For one of such materials, a notable high TOF (4.8 × 10−3 s−1) was found. It was found earlier that ethanol is an effective flocculent for zeolite layers by themselves, but in the presence of solid silica its efficiency was reduced.

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Section: Resultsmentioning

confidence: 83%

The effect of amorphous silica support on the catalytic activity of liquid-exfoliated monolayered MCM-56 zeolite

Ogorzały

Jajko²,

Korzeniowska³

et al. 2023

J Porous Mater

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“…It is made up of two non-intersecting pore systems with large 12-membered-ring supercages. [67,68] MCM-22 has been studied as a catalyst for the pyrolysis and Fischer-Tropsch process to produce phenolic compounds and liquid fuels, respectively. For acrolein production from glycerol, MCM-22 was active with up to 50% of acrolein selectivity.…”

Section: Mcm-22mentioning

confidence: 99%

A review on bi/multifunctional catalytic oxydehydration of bioglycerol to acrylic acid: Catalyst type, kinetics, and reaction mechanism

Abdullah

Ahmed

et al. 2021

Can J Chem Eng

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Acrylic acid, conventionally produced via propylene (non‐renewable fossil fuel route), is an industrially important chemical. The bio‐based feedstock process employing glycerol (a by‐product of biodiesel production) has attracted the attention of researchers due to its non‐polluting and renewable characteristics. Bi/multifunctional catalysts using a combination of zeolites, metal oxides, heteropoly acids, and phosphates have been mainly studied for the glycerol oxydehydration process. Brønsted acid sites favour acrolein generation over Lewis acid sites, whereas the redox sites convert the generated acrolein to acrylic acid. So far, the maximum acrylic acid yields of 60% and 59% have been reported on heteropoly acid and mixed metal oxide catalysts, respectively. Some DFT studies also revealed the deprotonation energy of acid sites and further helped in designing efficient catalysts. Despite these accomplishments, catalyst deactivation because of coking and stability remains a major problem. In this paper, various bi/multifunctional catalysts employed in glycerol oxydehydration to acrylic acid are critically reviewed. Different catalyst forms, preparation techniques, reaction kinetics, reaction mechanisms, deactivation, reactivation, process operating parameters, and sustainability are considered. In addition, the challenges associated with each catalyst type and strategies to overcome low yield, deactivation, and future directions are discussed.

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“…Some of these reaction pathways are aimed at increasing the accessibility of porous systems or maximizing the exposed external surface on which the hemisupercages are located. ExxonMobil worked to exploit some of these materials, the results of its own research activity, to continuously improve the catalytic performances of MCM-22 in the synthesis of cumene as witnessed by the numerous patents related to the MWW-family of molecular sieves, which besides MCM-22, includes MCM-36, MCM-49, and MCM-56, 69 applied in the liquid phase alkylation of benzene with propylene. The first patent was filed in 1995, 70 while the latest one was filed in 2018.…”

Section: ■ Synthesis Of Cumenementioning

confidence: 99%

Zeolite-Based Catalysis for Phenol Production

Perego

Angelis

Pollesel

et al. 2021

Ind. Eng. Chem. Res.

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Phenol is an important chemical commodity utilized for several applications (e.g., polycarbonate, epoxy–resins, phenolic resins, nylon). Its conventional production starts from benzene and propylene and is based on a series of reaction steps most of which are catalyzed by acid catalysts. Besides this technology other ones have been considered during the last decades, starting from other reactants and catalysts. Looking at the catalyst types both already in use or under evaluation, it is interesting to note that zeolites, as acidic catalysts or red-ox catalysts, were widely investigated. Therefore, the production of phenol represents a fascinating example of how zeolite catalysis contributes to improving the sustainability of these chemical processes by displacing the previous large use of corrosive and dangerous liquid acids and improving overall selectivity, which reduces the side production of wastes. Aromatic alkylation, transalkylation, and disproportionation, oxidations, rearrangements, oligomerization, and cracking are the reactions occurring in phenol production technologies, but also key unit operations in refineries and the chemical industry. A review of the zeolite catalysts utilized and proposed by major licensors and research groups in these technologies is provided as well as a discussion of key process differences and recent advances.

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MWW-Type Zeolites: MCM-22, MCM-36, MCM-49, and MCM-56 (A Review)

Cited by 30 publications

References 89 publications

The effect of amorphous silica support on the catalytic activity of liquid-exfoliated monolayered MCM-56 zeolite

The effect of amorphous silica support on the catalytic activity of liquid-exfoliated monolayered MCM-56 zeolite

A review on bi/multifunctional catalytic oxydehydration of bioglycerol to acrylic acid: Catalyst type, kinetics, and reaction mechanism

Zeolite-Based Catalysis for Phenol Production

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