Adsorption of dimethyl ether (DME) on zeolite molecular sieves

Lad, Jai; Makkawi, Yassir

doi:10.1016/j.cej.2014.07.001

Cited by 31 publications

(22 citation statements)

References 26 publications

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“…In this work, we do not focus on a specific reaction mechanism, but rather highlight the importance of the product sorption properties for a successful sorption‐enhanced catalytic reactor: CO is a gas at room temperature, and it is adsorbed only to a smaller extent in zeolites . Methanol, DME, and water are adsorbed in zeolites to different extents, with the corresponding heat of adsorption: water (

Δ H_{{normalH}_{2} O} = - 60 kJ {mol}^{- 1}

), methanol (

Δ H_{{CH}_{3} OH} = - 42 kJ {mol}^{- 1}

), and DME (

Δ H_{{CH}_{3} O {CH}_{3}} = - 25 kJ {mol}^{- 1}

) . A consequence of the adsorption of these products is their effect on the overall enthalpy of reaction Δ H sc [see Equation ]:

Δ H_{0} = + 41 \to Δ H_{normalsc} \approx - 20 [kJ ({mol}^{- 1} CO)]

Δ H_{0} = - 49 \to Δ H_{normalsc} \approx - 150 [kJ ({mol}^{- 1} {CH}_{3} OH)]

Δ H_{0} = - 122 \to Δ H_{normalsc} \approx - 330 [kJ

…”

Section: Introductionmentioning

confidence: 99%

Sorption‐Enhanced Methanol Synthesis

et al. 2019

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A small heat of reaction limits the efficiency of the catalytic hydrogenation of CO2 to form methanol; an improved efficiency can be achieved by shifting the thermodynamic equilibrium toward the formation of methanol. The exothermic adsorption of the products in sorption catalysts is shown to increase the reaction yield. The sorption catalysts consist of catalytically active Cu particles incorporated into a zeolite, which is known to strongly absorb water. In addition to high reaction yield of methanol, the sorption catalyst reduces CO2 to CO and dimethyl ether. An enhancement factor of up to 400% for CO and 130% for methanol and dimethyl ether at a relatively low pressure of 15 bar is shown. Furthermore, the following relevant parameters for future technical realization are derived: a high catalytic activity and the reversible adsorption of the products at reaction conditions. A key experiment that combines a catalytic reaction and a pressure swing desorption is presented and demonstrates the feasibility of sorption‐enhanced catalysis for efficient energy use in large‐scale reactors.

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Δ H_{{normalH}_{2} O} = - 60 kJ {mol}^{- 1}

), methanol (

Δ H_{{CH}_{3} OH} = - 42 kJ {mol}^{- 1}

), and DME (

Δ H_{{CH}_{3} O {CH}_{3}} = - 25 kJ {mol}^{- 1}

) . A consequence of the adsorption of these products is their effect on the overall enthalpy of reaction Δ H sc [see Equation ]:

Δ H_{0} = + 41 \to Δ H_{normalsc} \approx - 20 [kJ ({mol}^{- 1} CO)]

Δ H_{0} = - 49 \to Δ H_{normalsc} \approx - 150 [kJ ({mol}^{- 1} {CH}_{3} OH)]

Δ H_{0} = - 122 \to Δ H_{normalsc} \approx - 330 [kJ

…”

Section: Introductionmentioning

confidence: 99%

Sorption‐Enhanced Methanol Synthesis

et al. 2019

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“…The total heat of adsorption at each incremental pressure or stage was given by the energy balance around the adsorption cell. The assumptions used in deriving the above heat balance and the detailed equations applied to calculate each term can be found in [22]. The total heat of adsorption after the n-th stage of the incremental pressure is then given by adding the heat released at each stage divided by the corresponding total moles of gas adsorbed as follows: In comparing the zeolites, it is evident that the Mol5A has a substantially larger surface and microporous area per gram than Mol4A.…”

Section: Calculation Of the Heat Of Adsorptionmentioning

confidence: 99%

Adsorption of Methyl Chloride on Molecular Sieves, Silica Gels, and Activated Carbon

Lad

Makkawi

2020

Chem Eng & Technol

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Adsorption of methyl chloride (CH3Cl or MeCl) on five different types of adsorbents was investigated experimentally at increasing pressures and room temperature. Prior to adsorption, all adsorbents were analyzed to assess their physical and chemical characteristics. The experimental data was then used to determine the adsorption isotherms, heats of adsorption, adsorption rates, and their respective theoretical models. The MeCl adsorption capacity was found to reasonably correlate with the adsorbent's surface area. The MeCl adsorption isotherm and adsorption rates were fitted for the first time to a Freundlich isotherm model and pseudo first‐/second‐order kinetic models, respectively. The range of heat of adsorption indicated a physisorption type of bonding; hence, the investigated adsorbents can potentially be regenerated for cyclic adsorption.

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“…Dimethyl ether (DME) as an alternative clean energy source has been utilized as alternate fuel for automotive engines, fuel additive and home cooking gases to replace diesel and liquefied petroleum gas (LPG) . The catalytic conversion of syngas derived from coal, biomass, and natural gas to DME is one of the most promising ways to obtain an alternative clean energy source.…”

Section: Dimethyl Ether Synthesismentioning

confidence: 99%

Design and Synthesis of Powerful Capsule Catalysts Aimed at Applications in C1 Chemistry and Biomass Conversion

Bao

Tsubaki

2017

The Chemical Record

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Tandem catalytic reaction is a promising strategy to improve the utilization efficiency of energy and resources. The conventional hybrid catalysts cannot readily realize the precisely controlled synthesis of target products due to the unrestricted, open reaction environment. Assembling the hybrid catalyst with multiple active sites into core-shell structured capsule catalyst is one of the most effective ways to enhance the selectivity of desired products during a tandem catalysis process, because the core-shell structure offers a space-confined reaction field and synergistic effect. This review describes our recent progresses on the design and synthesis of coreshell structured zeolite capsule catalysts developed for C1 chemistry and biomass conversion. The various synthesis methods for constructing the well-defined zeolite capsule catalysts are described in detail. The applications of the capsule catalysts in catalysis, including the middle isoparaffins synthesis from syngas, one-step synthesis of dimethyl ether, and liquid-phase tandem reaction of glycerol conversion, are discussed, respectively. Our perspectives regarding the challenges and opportunities for future research in the field are also provided.

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Adsorption of dimethyl ether (DME) on zeolite molecular sieves

Cited by 31 publications

References 26 publications

Sorption‐Enhanced Methanol Synthesis

Sorption‐Enhanced Methanol Synthesis

Adsorption of Methyl Chloride on Molecular Sieves, Silica Gels, and Activated Carbon

Design and Synthesis of Powerful Capsule Catalysts Aimed at Applications in C1 Chemistry and Biomass Conversion

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