Ti-doped γ-Al2O3 versus ZSM5 zeolites for methanol to dimethyl ether conversion: In-situ DRIFTS investigation of surface interactions and reaction mechanism

Khaleel, Abbas; Ahmed, Mo’ath; Sowaid, Salem Ba

doi:10.1016/j.colsurfa.2019.03.052

Cited by 11 publications

(4 citation statements)

References 23 publications

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“…The in situ DRIFTS spectra have been obtained to investigate the adsorption behaviors of different compounds on the 10K 2 CO 3 /γ-Al 2 O 3 catalyst and the γ-Al 2 O 3 support (Figure ). For instance, the bands at 2936 and 2808 cm –1 of methanol adsorbed on K 2 CO 3 /γ-Al 2 O 3 shown in Figure a could be ascribed to the C–H vibration of the methoxy species. − In addition, the bands at 1400, 1306, and 1056 cm –1 could be assigned to the C–O vibration of the methoxy species. , The bands at 1401 and 1060 cm –1 of methanol adsorbed on γ-Al 2 O 3 shown in Figure b were also detected, which could be ascribed to the methoxy species bonded to the alumina surface. Therefore, it is suggested that methanol could be adsorbed on both the K 2 CO 3 and γ-Al 2 O 3 active sites with a dissociative adsorption mode and a similar adsorption strength.…”

Section: Resultsmentioning

confidence: 96%

Tunable Transesterification of Dimethyl Carbonate with Ethanol on K₂CO₃/Al₂O₃ Catalysts: Kinetic Modeling

Chi

Yan

et al. 2023

Ind. Eng. Chem. Res.

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The light alkyl carbonates are indispensable co-solvents of electrolytes for lithium-ion batteries. In this work, the tunable transesterification of dimethyl carbonate (DMC) with ethanol to co-produce ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) was investigated based on an efficient catalytic system with the solid alkaline catalyst. It was found that the γ-Al2O3-supported K2CO3 catalyst exhibited high activity for the transesterification reaction, with a tunable feature for the selectivities of EMC and DEC by changing the space velocity and feed ratio of DMC to ethanol at the temperature between 120 and 150 °C. According to the results of characterizations and activity tests, a synergistic mechanism was proposed. The reaction kinetic model was also established, which displayed good agreement with the experimental results.

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Section: Resultsmentioning

confidence: 96%

Tunable Transesterification of Dimethyl Carbonate with Ethanol on K₂CO₃/Al₂O₃ Catalysts: Kinetic Modeling

Chi

Yan

et al. 2023

Ind. Eng. Chem. Res.

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“…The proposed general mechanism of methanol-to-DME dehydration over the alumina surface is shown in Scheme 2 [59]. The methanol molecule interacts with the surface alumina oxygen anion and aluminium cation.…”

Section: Al 2 O 3 -Based Catalystsmentioning

confidence: 99%

Dehydration of Methanol to Dimethyl Ether—Current State and Perspectives

Chmielarz

2024

Catalysts

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The main groups of catalytic materials used in the conversion of methanol to dimethyl ether (the MTD process) were presented with respect to their advantages, disadvantages, and the methods of their modifications, resulting in catalysts with improved activity, selectivity, and stability. In particular, the effects of strength, surface concentration, and the type of acid sites, the porous structure and morphology of the catalytic materials, the role of catalyst activators, and others, were considered. The prosed mechanisms of the MTD process over various types of catalysts are presented. Moreover, the advantages of membrane reactors for the MTD process are presented and analysed. The perspectives in the development of effective catalysts for the dehydration of methanol to dimethyl ether are presented and discussed.

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“…A study showed that the binding between -OH and other substance became weaker with heating by in-situ DRIFTS [18]. EVOH is usually processed at around 195°C, so the hydrogen bonding is also studied during heating.…”

Section: Hydrogen Bonding Analysismentioning

confidence: 99%

Property improvements of EVOH by enhancing the hydrogen bonding

Wang

et al. 2019

Plastics, Rubber and Composites

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Ethylene-vinyl alcohol (EVOH) with excellent barrier properties is insufficient in mechanical properties, which limits its application. For the purpose of enhancing mechanical properties of EVOH, blend of anhydrous magnesium chloride (MgCl 2 ) with EVOH was prepared by melt blending. Enhanced hydrogen bonding can be achieved through interaction between the Cl of MgCl 2 and -OH in EVOH, and the stronger hydrogen bonding between MgCl 2 and EVOH was confirmed by using Fourier transform infrared spectrometer and X-ray photoelectron spectroscopy. The chemical, thermal and mechanical properties were evaluated. The thermal analysis of blends demonstrated that the melting temperature (T m ), the crystallisation temperature (T c ) and the crystallinity were effectively decreased with adding MgCl 2 , on the contrary, the glass transition (T g ) was significantly increased from 42.8 to 77.5°C. The mechanical test results revealed that MgCl 2 can significantly improve the storage modulus and the viscosity of EVOH, also the tensile strength was raised by nearly 30%.

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Ti-doped γ-Al2O3 versus ZSM5 zeolites for methanol to dimethyl ether conversion: In-situ DRIFTS investigation of surface interactions and reaction mechanism

Cited by 11 publications

References 23 publications

Tunable Transesterification of Dimethyl Carbonate with Ethanol on K₂CO₃/Al₂O₃ Catalysts: Kinetic Modeling

Tunable Transesterification of Dimethyl Carbonate with Ethanol on K₂CO₃/Al₂O₃ Catalysts: Kinetic Modeling

Dehydration of Methanol to Dimethyl Ether—Current State and Perspectives

Property improvements of EVOH by enhancing the hydrogen bonding

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Ti-doped γ-Al2O3 versus ZSM5 zeolites for methanol to dimethyl ether conversion: In-situ DRIFTS investigation of surface interactions and reaction mechanism

Cited by 11 publications

References 23 publications

Tunable Transesterification of Dimethyl Carbonate with Ethanol on K2CO3/Al2O3 Catalysts: Kinetic Modeling

Tunable Transesterification of Dimethyl Carbonate with Ethanol on K2CO3/Al2O3 Catalysts: Kinetic Modeling

Dehydration of Methanol to Dimethyl Ether—Current State and Perspectives

Property improvements of EVOH by enhancing the hydrogen bonding

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Product

Resources

About

Tunable Transesterification of Dimethyl Carbonate with Ethanol on K₂CO₃/Al₂O₃ Catalysts: Kinetic Modeling

Tunable Transesterification of Dimethyl Carbonate with Ethanol on K₂CO₃/Al₂O₃ Catalysts: Kinetic Modeling