Investigation of Catalytic Sustainability of Silica-Based Mesoporous Acidic Catalysts and Ion-Exchange Resins in Methyl Acetate Synthesis and Characterizations of Synthesized Catalysts

Şimşek, Veli

doi:10.1007/s13369-018-3570-y

Cited by 11 publications

(11 citation statements)

References 36 publications

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“…However, recently, direct HM has come to the forefront as an alternative synthesis method in studies where heteropoly acid catalysts (Fulvio et al, 2005) metals (Jimenez et al, 2010;Laugel et al, 2009) are used as active substances. Because HM has some advantages such as a homogeneous solution media for precursors, low material loss after synthesis procedure, low cost, and easy experiment properties or set up (Şimşek, 2019 ;Senapati & Maiti,2020).…”

Section: Introductionmentioning

confidence: 99%

“…SBA-15 is a suitable material for adsorption and separation in analytical environmental applications due to its high internal surface (400-900m²/g) areas Şimşek, 2015;Thieleman et al, 2011). It is also a suitable SPm in catalysts (Hess, 2009;Cavalleri et al, 2009;Şimşek, 2019). During the synthesis of SBA-15, which has a hexagonal mesoporous structure, it was observed that the pH value of the gel before washing with 300 ml of distilled water was always less than 0.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Fe/SBA-15 Heterogeneous Catalysts for Methyl Acetate Production

Şimşek¹

2021

European Journal of Science and Technology

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In the present study, the synthesis of SBA-15 (Santa Barbara Amorphous) support material(SPm) was initially carried out with the method determined according to the literature research. The catalytic property of SBA-15 was imparted by the hydrothermal method (HtM), different from the traditionally applied impregnation method. In this method, the active substance (iron III oxide; Fe2O3) was added to the solution during the synthesis of the SPm. The amount of active substance in the synthesized catalysts was calculated based on the mass ratios of silicon (Si) in SBA-15 and iron (Fe) in Fe2O3. The active substance ratios in the catalysts were determined as 10, 25% Fe/Si. The activities of Fe/SBA-15 catalysts were tested in methyl acetate production (MAP). MAP reaction experiments were carried out in the presence of 0.4g catalyst (Fe/SBA-15), 373K, in autogenous pressure and 2/1 Acetic acid(AA)/methanol(MeOH) feed rate for 48 hours. The effects of active substance loading rate on AA conversion were determined. The structural properties of Fe/SBA-15 catalysts were investigated by XRD, BET, FTIR/DRIFT, SEM/EDX, and MAPPING analysis methods.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Fe/SBA-15 Heterogeneous Catalysts for Methyl Acetate Production

Şimşek¹

2021

European Journal of Science and Technology

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“…However, the increase in the selectivity of tri-laurin was limited. The reason for this is the removal of water vapors formed in the reaction medium due to increasing temperature [12,17,30,35]. Water in the reaction medium is an unavoidable, since it is a by-product in glycerol esterification.…”

Section: Resultsmentioning

confidence: 99%

“…Then the sample is dried at 30 °C for 18 hours. In the final step of the synthesis, the calcination is carried out in a quartz reactor in a dry air environment, at 550 °C during 6 hours [30]. The STA was loaded with dry and wet impregnation methods before and after calcination into support material.…”

Section: A Synthesisof Mcm-41support Materialsmentioning

confidence: 99%

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Investigation Of Lauric Acid Conversion With The STA Incorporated Heterogeneous Catalysts In Liquid Phase Reaction

Şimşek

Mürtezaoğlu

2019

Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi

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In this study, firstly the synthesis of acidic catalysts was carried out by loading the active compound silicotungstic acid(STA) with dry (W/Si:10-50%) and wet (W/Si:10%) impregnation methods into MCM-41 support material. These synthesized catalysts were used in the production of mono-di and tri laurin. The amount of active substance in the synthesized catalysts was determined by the ratios of tungsten in STA and silicon in MCM-41 structure. Moreover, W/Si: 10% by weight of STA was applied to the support material after the calcination process was loaded by dry impregnation method. Brønsted acid (BA) and Lewis acid (LA) regions of synthesized catalysts were determined by DRIFT analysis. The catalytic activities of the catalysts were determined by a glycerollauric acid esterification reaction in a batch reactor. The effect of calcination and active compound ratio with reaction temperature on the lauric acid conversion and mono-di and tri laurin selectivity was investigated. Furthermore, the esterification reaction of glycerol with lauric acid was carried out under the same conditions in the presence of a commercial catalyst Amberlyst-21. The experimental results of the synthesized catalysts and Amberlyst-21catalyst were compared. The synthesized catalysts after comparison were observed that have high catalytic activity. Lauric acid conversion and monolaurin selectivity have been obtained with W/Si: 10% catalyst (dry impregnation method) 3/3/1 molar ratio at383K after 6 hours 95% and 88%, respectively. XRD analysis was conducted on calcineduncalcined MCM-41support material. Moreover, the structural properties of synthesized catalysts after the esterification reaction were determined by SEM-MAPPING analysis methods.

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Investigation of Graphene Oxide/Mesoporous Silica Supports for Enhanced Electrochemical Stability of Enzymatic Electrodes

Kaya,

Şimşek,

Şahin

2023

Catal Lett

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Mesoporous silica materials (MSMs) are widely used materials in many applications due to their diverse pore structures. However, the electrical conductivity of MSMs is poor which limits their use in electrochemical applications. In this study, widely used MSMs of different structural properties such as MCM-41, MCM-48, SBA-15, and SBA-16 were synthesized and reinforced with graphene oxide (GO) to obtain conductive composite supports for enzyme immobilization. MSMs were first synthesized using a hydrothermal method and characterized by Fourier-transform infrared spectroscopy, X-ray crystallography, scanning electron microscopy/energy dispersive X-ray, and MAPPING techniques. Aqueous dispersion of GO:MSM composites were prepared with as-synthesized materials and coated on screen-printed electrodes (SPE). The best composites were chosen based on their electroanalytical performance. Glucose oxidase (GOx) was then immobilized on modified SPEs using a simple drop-casting method to produce enzymatic electrodes. The electroanalytical performance of the enzymatic electrodes was investigated using different glucose concentrations to demonstrate biocatalytic activity. Stability tests were performed using intraday and interday measurements which revealed that SPE/GO:MCM-41/GOx electrode showed a more stable performance (3-folds) than SPE/GO/GOx electrode. This study presents an investigation of MSM mixed with GO in enzymatic electrochemical systems providing insight into the use of such materials to preserve enzyme activity. Graphical Abstract

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Investigation of Catalytic Sustainability of Silica-Based Mesoporous Acidic Catalysts and Ion-Exchange Resins in Methyl Acetate Synthesis and Characterizations of Synthesized Catalysts

Cited by 11 publications

References 36 publications

Synthesis and Characterization of Fe/SBA-15 Heterogeneous Catalysts for Methyl Acetate Production

Synthesis and Characterization of Fe/SBA-15 Heterogeneous Catalysts for Methyl Acetate Production

Investigation Of Lauric Acid Conversion With The STA Incorporated Heterogeneous Catalysts In Liquid Phase Reaction

Investigation of Graphene Oxide/Mesoporous Silica Supports for Enhanced Electrochemical Stability of Enzymatic Electrodes

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