Synthesis of some bifunctional catalysts and determination of kinetic parameters for direct conversion of syngas to dimethyl ether

Hadipour, Ali; Sohrabi, Morteza

doi:10.1016/j.cej.2007.04.039

Cited by 39 publications

(9 citation statements)

References 14 publications

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“…According to the atomic matrix method, three independent reactions were involved in the hydrogenation of CO 2 to DME in the plasma catalysis system, and CO 2 , CO, and DME were considered the key components. Equations were obtained on the basis of the chemical reaction equations and the mass balance:

true r_{{CO}_{2}} = \frac{d [(y_{{CO}_{2}, in} - y_{{CO}_{2}, out}) P / R T]}{d (W_{cat} / ϕ_{V})} = - r_{1} - r_{2}

true r_{CO} = \frac{d (y_{CO, out} P / R T)}{d (W_{cat} / ϕ_{V})} = r_{1}

true r_{DME} = \frac{d (y_{DME, out} P / R T)}{d (W_{cat} / ϕ_{V})} = 2 r_{3}

…”

Section: Resultsmentioning

confidence: 99%

Intrinsic Kinetics of Dimethyl Ether Synthesis from Plasma Activation of CO₂ Hydrogenation over Cu–Fe–Ce/HZSM‐5

Qin

2016

ChemPhysChem

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CO is activated in a plasma reactor followed by hydrogenation over a Cu-Fe-Ce/HZSM-5 catalyst, and the intrinsic kinetics of the plasma catalytic process are studied. Compared with CO hydrogenation using Cu-Fe-Ce/HZSM-5 alone, the CO conversion and the dimethyl ether selectivity for the plasma catalytic process are increased by 16.3 %, and 10.1 %, respectively, indicating that the CO was activated by the plasma to promote hydrogenation. A study of the intrinsic kinetics shows that the activation energies of methanol formation, the reverse water-gas shift reaction, and methanol dehydration to dimethyl ether are 149.34, 75.47, and 73.18 kJ mol , respectively, which are lower than if Cu-Fe-Ce/HZSM-5 is used without plasma, indicating that the activation of CO in the plasma reduces the activation energy of the hydrogenation reaction and improves the yield of dimethyl ether.

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true r_{{CO}_{2}} = \frac{d [(y_{{CO}_{2}, in} - y_{{CO}_{2}, out}) P / R T]}{d (W_{cat} / ϕ_{V})} = - r_{1} - r_{2}

true r_{CO} = \frac{d (y_{CO, out} P / R T)}{d (W_{cat} / ϕ_{V})} = r_{1}

true r_{DME} = \frac{d (y_{DME, out} P / R T)}{d (W_{cat} / ϕ_{V})} = 2 r_{3}

…”

Section: Resultsmentioning

confidence: 99%

Intrinsic Kinetics of Dimethyl Ether Synthesis from Plasma Activation of CO₂ Hydrogenation over Cu–Fe–Ce/HZSM‐5

Qin

2016

ChemPhysChem

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“…The tandem system dark fermentation-anaerobic digestion appears as a biogasification process of biomass (McKendry 2002a). The biosyngas produced can be used as chemical feedstock to produce liquid fuels (Wilhelm et al 2001;Chuang 2012) and/or fine chemicals (Spivey et al 2000;Hadipour and Sohrabi 2008).…”

Section: Biomethane Biohythane and Biosyngas Productionmentioning

confidence: 99%

Dark fermentation biorefinery in the present and future (bio)chemical industry

Bastidas‐Oyanedel

Bonk

Thomsen

et al. 2015

Rev Environ Sci Biotechnol

134

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Dark fermentation, also known as acidogenesis, involves the transformation of a wide range of organic substrates into a mixture of products, e.g. acetic acid, butyric acid and hydrogen. This bioprocess occurs in the absence of oxygen and light. The ability to synthesize hydrogen, by dark fermentation, has raised its scientific attention. Hydrogen is a nonpolluting energy carrier molecule. However, for energy generation, there is a variety of other sustainable alternatives to hydrogen energy, e.g. solar, wind, tide, hydroelectric, biomass incineration, or nuclear fission. Nevertheless, dark fermentation appears as an important sustainable process in another area: the synthesis of valuable chemicals, i.e. an alternative to petrochemical refinery. Currently, acetic acid, butyric acid and hydrogen are mostly produced by petrochemical reforming, and they serve as precursors of ubiquitous petrochemical derived products. Hence, the future of dark fermentation relies as a core bioprocess in the biorefinery concept. The present article aims to present and discuss the current and future status of dark fermentation in the biorefinery concept. The first half of the article presents the metabolic pathways, product yields and its technological importance, microorganisms responsible for mixed dark fermentation, and operational parameters, e.g. substrates, pH, temperature and head-space composition, which affect dark fermentation. The minimal selling price of dark fermentation products is also presented in this section. The second half discusses the perspectives and future of dark fermentation as a core bioprocess. The relationship of dark fermentation with other (bio)processes, e.g. liquid fuels and fine chemicals, algae cultivation, biomethane-biohythane-biosyngas production, and syngas fermentation, is then explored.

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“…[5][6][7] Bifunctional catalysts with methanol synthesis and methanol dehydration active sites are required for direct DME synthesis from synthesis gas. [8] Synthesis gas is utilizedt op roduce DME through the following reactions [Eqs. (1)-(4)]:…”

Section: Introductionmentioning

confidence: 99%

Simulation of Direct Dimethyl Ether Synthesis in a Slurry Reactor by Recirculation and Axial Dispersion Models

Ghorbaei

Ebrahim

2015

Energy Tech

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Dimethyl ether is an environmentally friendly alternative to diesel fuel. This fuel can be produced directly from synthesis gas in a slurry bubble column reactor. We predicted the performance of the slurry bubble column reactor for dimethyl ether synthesis using a recirculation model and comparison with axial dispersion results. The differential equations of recirculation and axial dispersion models for the dimethyl ether synthesis are solved for a similar kinetic equation. A comparison of the results with experimental data from the literature confirms that the recirculation model better represents the reactor behavior. Finally, the effects of operating variables are studied using a simulation framework.

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Synthesis of some bifunctional catalysts and determination of kinetic parameters for direct conversion of syngas to dimethyl ether

Cited by 39 publications

References 14 publications

Intrinsic Kinetics of Dimethyl Ether Synthesis from Plasma Activation of CO₂ Hydrogenation over Cu–Fe–Ce/HZSM‐5

Intrinsic Kinetics of Dimethyl Ether Synthesis from Plasma Activation of CO₂ Hydrogenation over Cu–Fe–Ce/HZSM‐5

Dark fermentation biorefinery in the present and future (bio)chemical industry

Simulation of Direct Dimethyl Ether Synthesis in a Slurry Reactor by Recirculation and Axial Dispersion Models

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Synthesis of some bifunctional catalysts and determination of kinetic parameters for direct conversion of syngas to dimethyl ether

Cited by 39 publications

References 14 publications

Intrinsic Kinetics of Dimethyl Ether Synthesis from Plasma Activation of CO2 Hydrogenation over Cu–Fe–Ce/HZSM‐5

Intrinsic Kinetics of Dimethyl Ether Synthesis from Plasma Activation of CO2 Hydrogenation over Cu–Fe–Ce/HZSM‐5

Dark fermentation biorefinery in the present and future (bio)chemical industry

Simulation of Direct Dimethyl Ether Synthesis in a Slurry Reactor by Recirculation and Axial Dispersion Models

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Intrinsic Kinetics of Dimethyl Ether Synthesis from Plasma Activation of CO₂ Hydrogenation over Cu–Fe–Ce/HZSM‐5

Intrinsic Kinetics of Dimethyl Ether Synthesis from Plasma Activation of CO₂ Hydrogenation over Cu–Fe–Ce/HZSM‐5