Post-synthetically modified hierarchical Mordenite and ZSM-5 zeolite and their catalytic performances in benzylation of acetic acid to benzyl acetate

Koshti, Hardik; Bandyopadhyay, Mahuya; Bandyopadhyay, Rajib

doi:10.1007/s10853-023-08770-3

Cited by 4 publications

(9 citation statements)

References 64 publications

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“…Table 5 indicates that the activation energy of the alkali-modified and parent Beta is lower than the previously reported values. [4,29,73] It is evident that the activation energy for AA benzylation with BA is at its lowest in the case of the alkali-modified sample. Figure S7 showcases the correlation between ln k and 1/T for both parent and alkali-modified Beta.…”

Section: Reaction Kineticsmentioning

confidence: 98%

“…[59][60][61] Another peak around 0 ppm is observed, which is assigned to the octahedral Al species [as extra-framework aluminum (EFAL)], and its intensity is slightly higher for the modified zeolite due to decreased symmetry of some Al sites. [56,60,61] The 29 Si MAS NMR spectra of parent and hierarchical zeolites (Figure 3) show signals at ca. À 110 ppm and ca.…”

Section: Catalystmentioning

confidence: 99%

“…A linear plot of -ln (1-X AA ) against time was generated (Figure S6), which is consistent with previous research. [4,29,73] Linear regression analysis was performed using the software Origin2021, and the value of k was obtained from the slope of the trend line. Results indicate that the rate constant, k, increased with increasing temperature (Table S3).…”

Section: Reaction Kineticsmentioning

confidence: 99%

“…The rate at which benzyl alcohol benzylates acetic acid can be accurately described using first order reaction kinetics, as evidenced by empirical data presented in scholarly literature. [4,29,73] This phenomenon can be expressed mathematically through the following equation ( 1).…”

Section: Reaction Kineticsmentioning

confidence: 99%

“…[17][18][19][20][21][22][23][24] Recently the effect of many zeolites has been investigated in benzylation of acetic acid reaction. Instead of mineral acids, zeolites like Beta, ZSM-5, Mordenite, USY, Y, X and Meso ZSM-5 (SO 3 H-CTAB)-MW [25][26][27][28][29] were employed as heterogeneous catalysts in benzylation reaction, owing to their high acidity, low corrosivity, strong thermal stability. Nevertheless, diffusional constraint occurs for bulky substrates when using small pore zeolites [30] resulting in poor selectivity and catalyst deactivation.…”

Section: Introductionmentioning

confidence: 99%

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Micro‐Mesoporous Hierarchical Beta Zeolite and its Catalytic Application in Acetic Acid Benzylation

Koshti,

Bandyopadhyay,

Bandyopadhyay

2023

ChemistrySelect

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Hierarchical Beta zeolite with tailor‐made pore structure is prepared by post‐synthetic alkali (NaOH) treatment. XRD, FE‐SEM, ICP‐OES, 27Al & 29Si MAS NMR, and N2 sorption isotherms were used to explore the structural transformation of these materials. ICP‐OES analysis showed post‐synthetic base treatment resulting into tuning of the Si/Al ratio, thereby increasing the acidity of the sample. The acidic properties of materials were measured using acid‐base titration, Pyridine FTIR spectroscopy, and NH3‐TPD. Conversion of acetic acid to benzyl acetate by reacting with benzyl alcohol was studied using hierarchical and parent sample. The reaction was evaluated with theoretical and experimental approaches. Under optimum reaction conditions, desilicated Beta zeolite showed 93 % acetic acid conversion and 90 % benzyl acetate selectivity, as confirmed by GC and GC‐MS analyses. Theoretical analysis indicated direct relationship between rate constant and rising reaction temperature, in accordance with the principles of first‐order reaction kinetics (R2>0.95). The activation energy for acetic acid benzylation over Beta‐0.1 M NaOH was found to be 10.21 kJ mol−1, considerably lower value compared to previous reports.

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Section: Reaction Kineticsmentioning

confidence: 98%

Section: Catalystmentioning

confidence: 99%

Section: Reaction Kineticsmentioning

confidence: 99%

Section: Reaction Kineticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micro‐Mesoporous Hierarchical Beta Zeolite and its Catalytic Application in Acetic Acid Benzylation

Koshti,

Bandyopadhyay,

Bandyopadhyay

2023

ChemistrySelect

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Soft-templating synthesis of hierarchical mordenite as high-performance catalyst for cyclic acetals production via acetylation of glycerol and benzaldehyde

Gong,

Alomar,

AlMasoud

et al. 2024

Microporous and Mesoporous Materials

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Synthesis and application of ZSM-5/Graphene composite for photocatalytic degradation of industrial dyes

Sodha,

Bandyopadhyay,

Gaur

et al. 2024

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Various materials and technologies are being employed to address the concern of increased wastewater generation. In this work, the synthesis of ZSM-5 (Zeolite Socony Mobil-5) and graphene (GR) composite, their characterisation, and application for the removal of dyes are presented. Two composites of ZSM-5 and GR composites were prepared via the hydrothermal method by varying the loading amount of GR, i.e. 1% and 5%, and labelled as GZ1 and GZ5. The parent and composite materials were characterised using field emission scanning electron microscope (FE-SEM), x-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), x-ray photoelectrons spectroscopy (XPS), Raman, and Fourier transform infrared (FTIR). The materials were then employed for the photodegradation of methyl orange (MO) dye. The adsorption efficiencies for ZSM-5, GR, GZ1, and GZ5 were found as 0%, 17.8%, 0%, and 16% respectively. According to photodegradation results, the GZ1 composite exhibits the maximum degradation efficiency of 75.3% for 20 ppm of MO, within 180 min of light exposure. The scavenger studies were performed to evaluate the role of active oxygen species (AOS) in the photocatalysis mechanism. All studies were performed with the catalyst dosage of 0.5 mg ml−1. The degradation efficiencies for GR, GZ5, and Z5 were reported as 34.2%, 20.8%, and 17.5%, respectively. On increasing the irradiation time to 240 min, the degradation efficiency of GZ1 reached 92%. The removal efficiencies for MO (7 ppm) and methyl blue (5 ppm) in a 12-ppm dye mixture were observed to be 98% and 97.2% respectively within 180 min of light exposure with GZ1 composite.

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Post-synthetically modified hierarchical Mordenite and ZSM-5 zeolite and their catalytic performances in benzylation of acetic acid to benzyl acetate

Cited by 4 publications

References 64 publications

Micro‐Mesoporous Hierarchical Beta Zeolite and its Catalytic Application in Acetic Acid Benzylation

Micro‐Mesoporous Hierarchical Beta Zeolite and its Catalytic Application in Acetic Acid Benzylation

Soft-templating synthesis of hierarchical mordenite as high-performance catalyst for cyclic acetals production via acetylation of glycerol and benzaldehyde

Synthesis and application of ZSM-5/Graphene composite for photocatalytic degradation of industrial dyes

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