Mesoporous MFI zeolites by microwave induced assembly between sulfonic acid functionalized MFI zeolite nanoparticles and alkyltrimethylammonium cationic surfactants

Jin, Hailian; Ansari, Mohd Bismillah; Park, Sang-Eon

doi:10.1039/c1cc12259b

Cited by 44 publications

(38 citation statements)

References 29 publications

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“…Such materials help to overcome the limitation of microporous zeolites pore size and therefore allow large molecules to diffuse through [11]. The synthesis of mesoporous ZSM-5 via a dissolution process include the re-assembling of amorphous silica directed by surfactant molecules simultaneously; the re-assembling of the total dissolved structure of zeolite around surfactant molecules has also been reported [12]. In the presence of long-chain alkyl ammonium surfactants, the dissolved silicates accumulate within surfactant molecules to make micelles and re-precipitate onto the surface of parent spheres surface to convert amorphous silica into mesoporous silica during the hydrothermal reaction [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Uniform Mesoporous Zeolite ZSM-5 Catalyst for Friedel-Crafts Acylation

et al. 2019

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This work highlights how the treatment of ZSM-5 (parent Zeolite Socony Mobil–5, Si/Al = 23) with different surfactant templates and alkaline solution, improved the catalytic performance in the Friedel-Crafts acylation of anisole with a propionic anhydride to obtain p-methoxypropiophenone. The modified microporous to mesoporous zeolite catalysts were characterized using different analytical techniques, including X-ray diffraction (XRD), nitrogen porosimetry, Fourier-transform infrared spectroscopy (FT-IR), temperature-programmed desorption (ammonia-TPD) and field emission scanning electron microscopy (FE-SEM) to analyze the crystallographic structure, surface acidity, surface area, porosity, morphology, and particle size. The results showed that the formed mesoporous zeolite by NaOH solution had smaller mesopores (ca. 3.7 nm) as compared to the mesoporous zeolites obtained by surfactant templates, such as, CTAB (ca. 14.9 nm), TPAOH (ca. 11.1 nm) and mixture of CTAB/TPAOH (ca. 15.2 nm). The catalytic acylation reaction was conducted in a batch glass reactor at various temperatures and the products were analyzed using off-line gas chromatography–mass spectrometry (GC-MS). It was found that the activity of treated ZSM-5 with mixed surfactant templates (CTAB/TPAOH) exhibited enhanced selectivity towards the main product (p-methoxypropiophenone) by a factor 1.7 or higher than unmodified ZSM-5 due to its increased surface area by 1.5 times and enhanced acid sites.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Uniform Mesoporous Zeolite ZSM-5 Catalyst for Friedel-Crafts Acylation

et al. 2019

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“…[57] Later, a wide range of multi-cationic structure-directing agents has been synthesized to produce disordered and highly ordered crystalline mesoporous ZSM-5 (Scheme 3b) (Table 2, entries 6-8). [58] It is also reported that only a suitable kind of SDAs are required to produce mesoporous Beta (Scheme 3c). [59] Initially, highly costly cyclic SDA has been found successful for the synthesis of zeolite Beta, but later several economical piperidine and imidazole based SDAs have been reported for the synthesis of zeolite Beta (Scheme 3c) (Table 2, entries 9-12).…”

Section: Template-mediated Synthesis Of Mesoporous Zeolitesmentioning

confidence: 99%

Comprehensive Understanding of the Eco‐Friendly Synthesis of Zeolites: Needs of 21^st Century Sustainable Chemical Industries

Rani

Srivastava

2020

The Chemical Record

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Zeolites have taken a leading position in petrochemical, fine, and bulk chemical industries due to their porous architecture, pore sizes, tunable acidity, and thermal stability. Various strategies of zeolites preparation, including template‐free, solvent‐free, and toxic mineral‐free strategies are summarized. Moreover, the zeolite synthesis using naturally occurring minerals and sustainable natural templates is also discussed, which involves the synthesis of nanocrystalline zeolites of different framework structures using plant‐based natural templates and biomass‐derived renewable chemicals. Overall this personal account provides the fundamentals of various sustainable synthetic strategies reported in the literature for the synthesis of zeolites with suitable examples that will be useful for the students and will motivate experienced researchers to develop various novel sustainable methods for the synthesis of zeolites and other inorganic materials of industrial relevance.

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“…Zeolite ZSM-5-160 (Table 1) with Si/Al = 100 (in the initial RM) and its sol-precursors in alkali metal-free reaction media were synthesized in the same procedure given in [27,28] with tetrapropylammonium hydroxide (TPAOH) as a molecular template; composition of zeolite forming RM: 1.0SiO 2 : 0.005Al 2 O 3 : 0.45TPAOH : 35H 2 O. Aluminum isopropoxide (0.048 g of Al(OiPr) 3 , Aldrich, C98 %) and 10.8 ml of TPAOH solution, Sigma-Aldrich (20 %) were added to 3.6 ml of H 2 O, the resulting mixture was stirred until Al(OiPr) 3 dissolution.…”

Section: Synthesis Of the Samplesmentioning

confidence: 99%

Two-stage dual template alkali metal-free synthesis of micro-mesoporous aluminosilicates based on ZSM-5 zeolite precursors

et al. 2016

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Carrying out the dual template synthesis (in the presence of molecular and micellar templates) in the alkali metal-free reaction media (pH 11.7-12) at a relatively lowtemperature hydrothermal treatment (100-120°C, duration 3-5 days) allowed to obtain micro-mesoporous aluminosilicates combining the properties of zeolite ZSM-5 and mesoporous molecular sieve AlSi-MCM-41. X-ray amorphous sol-precursors of ZSM-5 zeolite obtained by preliminary hydrothermal treatment of alkali metal-free reaction mixture at 160°C and containing secondary building units of zeolite were used as initial substances for synthesis of micro-mesoporous aluminosilicates. During the joint formation of the structure of zeolite and mesoporous molecular sieve in one reaction mixture and in contiguous conditions close to optimal for their individual formation, composites zeolite/mesoporous molecular sieve were formed. The structural and sorption characteristics and acidity of the obtained composites differ from mechanical mixture of two phases. X-ray amorphous micro-mesoporous aluminosilicate with secondary building units and precursors of ZSM-5 in mesostructure is characterized by higher concentration and strength of Brønsted and Lewis acid sites as well as a higher catalytic activity in the reaction of cracking of cumene compared to AlSi-MCM-41 of similar composition. This aluminosilicate also exhibits a higher total selectivity toward the major products of reaction, in comparison with ZSM-5.Keywords Micro-mesoporous aluminosilicates Á Dual template alkali metal-free synthesis Á Zeolite ZSM-5 precursors Á The degree of zeolitization Á Structure and sorption properties Á Acidity Á Catalytic cracking of cumene

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Mesoporous MFI zeolites by microwave induced assembly between sulfonic acid functionalized MFI zeolite nanoparticles and alkyltrimethylammonium cationic surfactants

Cited by 44 publications

References 29 publications

Synthesis of Uniform Mesoporous Zeolite ZSM-5 Catalyst for Friedel-Crafts Acylation

Synthesis of Uniform Mesoporous Zeolite ZSM-5 Catalyst for Friedel-Crafts Acylation

Comprehensive Understanding of the Eco‐Friendly Synthesis of Zeolites: Needs of 21^st Century Sustainable Chemical Industries

Two-stage dual template alkali metal-free synthesis of micro-mesoporous aluminosilicates based on ZSM-5 zeolite precursors

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Mesoporous MFI zeolites by microwave induced assembly between sulfonic acid functionalized MFI zeolite nanoparticles and alkyltrimethylammonium cationic surfactants

Cited by 44 publications

References 29 publications

Synthesis of Uniform Mesoporous Zeolite ZSM-5 Catalyst for Friedel-Crafts Acylation

Synthesis of Uniform Mesoporous Zeolite ZSM-5 Catalyst for Friedel-Crafts Acylation

Comprehensive Understanding of the Eco‐Friendly Synthesis of Zeolites: Needs of 21st Century Sustainable Chemical Industries

Two-stage dual template alkali metal-free synthesis of micro-mesoporous aluminosilicates based on ZSM-5 zeolite precursors

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Comprehensive Understanding of the Eco‐Friendly Synthesis of Zeolites: Needs of 21^st Century Sustainable Chemical Industries