Dimethyl ether production via methanol dehydration using Fe3O4 and CuO over γ–χ–Al2O3 nanocatalysts

Armenta, M.A.; Maytorena, V.M.; Flores-Sanchez, L. A.; Quintana, Juan Manuel; Valdez, R.; Olivas, A.

doi:10.1016/j.fuel.2020.118545

Cited by 36 publications

(9 citation statements)

References 51 publications

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“…The formation of DME via catalytic dehydration of methanol was also achieved by the promotion of Cu/γ-Al 2 O 3 catalyst with hematite (Fe 2 O 3 ), as it was demonstrated by Olivas and co-workers [100,101]. The possible reaction mechanism proposed by authors is shown in Figure 8.…”

Section: Al 2 O 3 -Based Catalystsmentioning

confidence: 72%

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Direct Synthesis of Dimethyl Ether from CO2: Recent Advances in Bifunctional/Hybrid Catalytic Systems

et al. 2021

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Dimethyl ether (DME) is a versatile raw material and an interesting alternative fuel that can be produced by the catalytic direct hydrogenation of CO2. Recently, this process has attracted the attention of the industry due to the environmental benefits of CO2 elimination from the atmosphere and its lower operating costs with respect to the classical, two-step synthesis of DME from syngas (CO + H2). However, due to kinetics and thermodynamic limits, the direct use of CO2 as raw material for DME production requires the development of more effective catalysts. In this context, the objective of this review is to present the latest progress achieved in the synthesis of bifunctional/hybrid catalytic systems for the CO2-to-DME process. For catalyst design, this process is challenging because it should combine metal and acid functionalities in the same catalyst, in a correct ratio and with controlled interaction. The metal catalyst is needed for the activation and transformation of the stable CO2 molecules into methanol, whereas the acid catalyst is needed to dehydrate the methanol into DME. Recent developments in the catalyst design have been discussed and analyzed in this review, presenting the different strategies employed for the preparation of novel bifunctional catalysts (physical/mechanical mixing) and hybrid catalysts (co-precipitation, impregnation, etc.) with improved efficiency toward DME formation. Finally, an outline of future prospects for the research and development of efficient bi-functional/hybrid catalytic systems will be presented.

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Section: Al 2 O 3 -Based Catalystsmentioning

confidence: 72%

“…The spent catalyst exhibited an absence of changes in the chemical oxidation states of Cu and Fe after the reaction confirmed by XPS. The methanol conversion was maintained after catalyst regeneration at 600 °C for 2 h in air, showing the reusability of the Cu-Fe2O3/γ-Al2O3 catalyst [101].…”

Section: Zeolite-based Catalystsmentioning

confidence: 84%

Direct Synthesis of Dimethyl Ether from CO2: Recent Advances in Bifunctional/Hybrid Catalytic Systems

et al. 2021

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“…Once the methanol is obtained, the formation of DME is carried out over a variety of acidic solid catalysts at 200-300°C and typically gives DME in high yield and selectivity through methanol dehydration. Example catalysts include supported iron and copper oxides and copper/zinc/zirconica catalysts, typically used in CO 2 hydrogenation to methanol (Armenta et al, 2020). These catalysts can approach the maximum theoretical yields and selectivities for the reaction, which are limited by the presence of water (Migliori et al, 2020).…”

Section: Dimethyl Ether From Methanementioning

confidence: 99%

Synthetic Fuels Based on Dimethyl Ether as a Future Non-Fossil Fuel for Road Transport From Sustainable Feedstocks

2021

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In this review we consider the important future of the synthetic fuel, dimethyl ether (DME). We compare DME to two alternatives [oxymethylene ether (OMEx) and synthetic diesel through Fischer-Tropsch (FT) reactions]. Finally, we explore a range of methodologies and processes for the synthesis of DME.DME is an alternative diesel fuel for use in compression ignition (CI) engines and may be produced from a range of waste feedstocks, thereby avoiding new fossil carbon from entering the supply chain. DME is characterised by low CO2, low NOx and low particulate matter (PM) emissions. Its high cetane number means it can be used in CI engines with minimal modifications. The key to creating a circular fuels economy is integrating multiple waste streams into an economically and environmentally sustainable supply chain. Therefore, we also consider the availability and nature of low-carbon fuels and hydrogen production. Reliable carbon dioxide sources are also essential if CO2 utilisation processes are to become commercially viable. The location of DME plants will depend on the local ecosystems and ideally should be co-located on or near waste emitters and low-carbon energy sources. Alternative liquid fuels are considered interesting in the medium term, while renewable electricity and hydrogen are considered as reliable long-term solutions for the future transport sector. DME may be considered as a circular hydrogen carrier which will also be able to store energy for use at times of low renewable power generation.The chemistry of the individual steps within the supply chain is generally well known and usually relies on the use of cheap and Earth-abundant metal catalysts. The thermodynamics of these processes are also well-characterised. So overcoming the challenge now relies on the expertise of chemical engineers to put the fundamentals into commercial practice. It is important that a whole systems approach is adopted as interventions can have detrimental unintended consequences unless close monitoring is applied. This review shows that while DME production has been achieved and shows great promise, there is considerable effort needed if we are to reach true net zero emissions in the transport sector, particularly long-haul road use, in the require timescales.

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“…There is thus an increasing requirement for a large scale of DME production. A number of solid acid catalysts involving acidic zeolites, ,− γ-Al 2 O 3 or modified γ-Al 2 O 3 , , composite oxides, , heteropolyacids, − etc., have been developed for the catalytic synthesis of DME. Among them, γ-Al 2 O 3 demonstrates a competitive power because of its economic efficiency and high selectivity.…”

Section: Introductionmentioning

confidence: 99%

Highly Dispersed CrO_x Nanoparticle-Modified NaZSM-5 for Dehydration of Methanol to Dimethyl Ether

et al. 2023

Ind. Eng. Chem. Res.

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In this work, CrO x nanoparticle-and H + -modified NaZSM-5 was prepared by impregnating in chromium nitrite aqueous solution to form Cr/HNaZSM-5 composites. They were characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet− visible (UV−vis), XPS, 29 Si and 27 Al MAS NMR, NH 3 −(CO 2 −) TPD, and N 2 adsorption/desorption measurements, revealing that the Cr/ HNaZSM-5 composites possessed moderate surface acidity and basicity due to the Cr species or H + partly substituting for the counter Na + and highly dispersed CrO x nanoparticles on zeolites. The obtained composites thus provided promoting performance for catalyzing methanol dehydration to dimethyl ether with >90% conversion and ca. 100% selectivity at a lower reaction temperature. The promoted performance comes from acidic and basic sites for activating methanol to produce CH 3 + and CH 3 O − intermediates, respectively. Moreover, as the catalyst works in succession over 500 h, the reactivity abatement is not found, suggesting excellent running stability.

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Dimethyl ether production via methanol dehydration using Fe3O4 and CuO over γ–χ–Al2O3 nanocatalysts

Cited by 36 publications

References 51 publications

Direct Synthesis of Dimethyl Ether from CO2: Recent Advances in Bifunctional/Hybrid Catalytic Systems

Direct Synthesis of Dimethyl Ether from CO2: Recent Advances in Bifunctional/Hybrid Catalytic Systems

Synthetic Fuels Based on Dimethyl Ether as a Future Non-Fossil Fuel for Road Transport From Sustainable Feedstocks

Highly Dispersed CrO_x Nanoparticle-Modified NaZSM-5 for Dehydration of Methanol to Dimethyl Ether

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Dimethyl ether production via methanol dehydration using Fe3O4 and CuO over γ–χ–Al2O3 nanocatalysts

Cited by 36 publications

References 51 publications

Direct Synthesis of Dimethyl Ether from CO2: Recent Advances in Bifunctional/Hybrid Catalytic Systems

Direct Synthesis of Dimethyl Ether from CO2: Recent Advances in Bifunctional/Hybrid Catalytic Systems

Synthetic Fuels Based on Dimethyl Ether as a Future Non-Fossil Fuel for Road Transport From Sustainable Feedstocks

Highly Dispersed CrOx Nanoparticle-Modified NaZSM-5 for Dehydration of Methanol to Dimethyl Ether

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Highly Dispersed CrO_x Nanoparticle-Modified NaZSM-5 for Dehydration of Methanol to Dimethyl Ether