Generation of Brönsted acidity in AlMCM-41 by sulphation for enhanced liquid phase tert-butylation of phenol

Ng, Eng-Poh; Nur, Hadi; Wong, Ka-Lun; Muhid, Mohd Nazlan Mohd; Hamdan, Halimaton

doi:10.1016/j.apcata.2007.02.001

Cited by 35 publications

(13 citation statements)

References 28 publications

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“…On the other hand, the bands at around 792 cm À1 and 543 cm À1 are due to the symmetric stretching of SiO 4 or AlO 4 and double ring vibration respectively. The small band observed at around 451 cm À1 is assigned to SieOeSi bending modes [19]. In Fig.…”

Section: Physical Propertiesmentioning

confidence: 87%

“…As shown in Fig. 1 mode of OeH of water [19]. Besides that, the broad band at around 1091 cm À1 , the most prominent in the IR spectra, corresponds to asymmetric stretching of the internal vibration bands of SiO 4 or AlO 4 while the small bands observed at around 1223 cm À1 is assigned to asymmetric stretching of the external vibration bands of SiO 4 or AlO 4 [20].…”

Section: Physical Propertiesmentioning

confidence: 99%

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Organosulfonic acid functionalized zeolite ZSM-5 as temperature tolerant proton conducting material

Nur

Kee

Hamdan

et al. 2012

International Journal of Hydrogen Energy

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Section: Physical Propertiesmentioning

confidence: 87%

Section: Physical Propertiesmentioning

confidence: 99%

Organosulfonic acid functionalized zeolite ZSM-5 as temperature tolerant proton conducting material

Nur

Kee

Hamdan

et al. 2012

International Journal of Hydrogen Energy

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“…These materials have unique properties, such as their uniform microporous structure, hydrophilic surfaces, adjustable framework composition and strong chemical interactions with guest molecules. These properties have made them suitable candidates for widespread applications, including gas separation, adsorption, ion-exchange and catalysis [2][3][4][5][6][7][8]. The search for new materials is important especially for the petrochemical and pharmaceutical industries.…”

Section: Introductionmentioning

confidence: 99%

Effects of Synthesis Parameters on Crystallization Behavior of K-MER Zeolite and Its Morphological Properties on Catalytic Cyanoethylation Reaction

et al. 2020

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MER-type zeolite is an interesting microporous material that has been widely used in catalysis and separation. By carefully controlling the synthesis parameters, a procedure to synthesize K-MER zeolite crystals with various morphologies has been developed. The silica, water and mineralizer content in the synthesis gel, as well as crystallization time and temperature, have a profound impact on the crystallization kinetics, resulting in zeolite solids with various degrees of crystallinity, crystal sizes and shapes. K-MER zeolite crystals with nanorod, bullet-like, prismatic and wheatsheaf-like morphologies have been successfully obtained. The catalytic performances of the K-MER zeolites in cyanoethylation of methanol, under novel non-microwave instant heating, have been investigated. The zeolite in nanosize form shows the best catalytic performance (94.1% conversion, 100% selectivity) while the bullet-like zeolite gives poorest catalytic performance (44.2% conversion, 100% selectivity).

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“…Zeolites are crystalline aluminosilicate microporous minerals and are considered widely used in many potential applications, such as adsorption, ion exchange, drug delivery, and catalysis [1][2][3][4][5][6][7][8][9]. 2 of 16 In particular, Cs-pollucite is interesting because it has strong basic sites due to the presence of the alkali Cs + cation [10,11].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Cs–Pollucite Nanozeolite Modified with Novel Organosilane as an Excellent Solid Base Catalyst for Claisen–Schmidt Condensation of Benzaldehyde and Acetophenone

et al. 2020

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Cs–pollucite can be a potential solid base catalyst due to the presence of (Si-O-Al)−Cs+ basic sites. However, it severely suffers from molecular diffusion and pore accessibility problems due to its small micropore opening. Herein, we report the use of new organosilane, viz. dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride (TPOAC), as a promising pore-expanding agent to develop the hierarchical structure in nanosized Cs–pollucite. In respect to this, four different amounts of TPOAC were added during the synthesis of hierarchical Cs–pollucite (CP-x, x = 0, 0.3, 1.0, or 2.0, where x is the molar ratio of TPOAC) in order to investigate the effects of TPOAC in the crystallization process of Cs–pollucite. The results show that an addition of TPOAC altered the physico-chemical and morphological properties of hierarchical Cs–pollucite, such as the crystallinity, crystallite size, pore size distribution, surface areas, pore volume, and surface basicity. The prepared solids were also tested in Claisen–Schmidt condensation of benzaldehyde and acetophenone, where 82.2% of the conversion and 100% selectivity to chalcone were achieved by the CP-2.0 catalyst using non-microwave instant heating (200 °C, 100 min). The hierarchical CP-2.0 nanocatalyst also showed better catalytic performance than other homogenous and heterogeneous catalysts and displayed a high catalyst reusability with no significant deterioration in the catalytic performance even after five consecutive reaction runs.

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Generation of Brönsted acidity in AlMCM-41 by sulphation for enhanced liquid phase tert-butylation of phenol

Cited by 35 publications

References 28 publications

Organosulfonic acid functionalized zeolite ZSM-5 as temperature tolerant proton conducting material

Organosulfonic acid functionalized zeolite ZSM-5 as temperature tolerant proton conducting material

Effects of Synthesis Parameters on Crystallization Behavior of K-MER Zeolite and Its Morphological Properties on Catalytic Cyanoethylation Reaction

Hierarchical Cs–Pollucite Nanozeolite Modified with Novel Organosilane as an Excellent Solid Base Catalyst for Claisen–Schmidt Condensation of Benzaldehyde and Acetophenone

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