Effect of precipitants during the preparation of Cu-ZnO-Al2O3/Zr-ferrierite catalyst on the DME synthesis from syngas

Bae, Jong Wook; Kang, Suk-Hwan; Lee, Yun-Jo; Jun, Ki‐Won

doi:10.1016/j.jiec.2009.01.014

Cited by 50 publications

(22 citation statements)

References 26 publications

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“…c-Al 2 O 3 was easily synthesized by using the carbon black-alumina composites, where carbon black acts as an adjusting material of the pore size and surface area of c-Al 2 O 3 . Even though the contributions of the surface area of metallic copper and acidity of solid-acid components were well reported in our previous works [7,11,12,14], the acidic and structural contribution of the easily tunable c-Al 2 O 3 structures to the catalytic activity and the dispersion of copper-containing particles were not sufficiently reported as far as we know. Therefore, the effects of the acidity and the structure of c-Al 2 O 3 derived from carbon black-alumina composites on the dispersion of Cu-ZnO-Al 2 O 3 and the catalytic activity were explained by measuring the acidity and the surface area of the hybrid catalysts with the enhanced stability of the active copper-containing particles after reaction.…”

Section: Introductionmentioning

confidence: 67%

“…The solid-acid component of alumina for the preparation of hybrid catalysts has been more generally used than zeolites because it shows a higher selectivity to DME due to its lower amount of strong acidic sites, which can possibly produce hydrocarbon byproducts by the reforming reaction of DME and (or) methanol at an uncontrolled high reaction temperature in an adiabatic condition [10,11]. In addition, the easily tunable pore size, surface area, and acid sites of alumina have been more attractive for preparing hybrid catalysts by incorporating copper-based hydrogenation catalysts [12,13].…”

Section: Introductionmentioning

confidence: 99%

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The role of the acidity of alumina prepared by aluminum-carbon black composite for CO hydrogenation to dimethyl ether on hybrid Cu–ZnO–Al2O3/alumina

Ham

Jeong

Koo

et al. 2015

Reac Kinet Mech Cat

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The effects of surface area and the acidity of mesoporous c-Al 2 O 3 , which is prepared by calcining aluminum-carbon black composite (Al/CB) of the precipitated aluminum nitrate on carbon black at different weight ratios, were investigated to verify the roles of carbon black in the surface properties and stability of Cu-ZnO-Al 2 O 3 for the direct synthesis of dimethyl ether (DME) from syngas. A high surface area of *100 m 2 /g with a large pore diameter of *25 nm originated from the occupied spaces of carbon black enhanced the dispersion of the active Cu-ZnO-Al 2 O 3 particles by forming a strong and stable interaction with mesoporous solid acid c-Al 2 O 3 surfaces. The enhanced dispersion of copper-containing particles, being strongly interacted with the acid sites of the hybrid Cu-ZnO-Al 2 O 3 / Al 2 O 3 catalyst using c-Al 2 O 3 prepared at an optimal Al/CB weight ratio of 10, is mainly responsible for the high CO conversion with a high yield to oxygenates and a suppressed aggregation of active copper species during the direct synthesis of DME from syngas.Keywords Dimethyl ether (DME) Á Syngas Á Cu-ZnO-Al 2 O 3 Á Hybrid catalyst Á Composite of carbon black and alumina Á Acid sites Electronic supplementary material The online version of this article (

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Section: Introductionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

The role of the acidity of alumina prepared by aluminum-carbon black composite for CO hydrogenation to dimethyl ether on hybrid Cu–ZnO–Al2O3/alumina

Ham

Jeong

Koo

et al. 2015

Reac Kinet Mech Cat

Self Cite

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“…33,34 The structural properties of nanocatalysts synthesized via this method have been influenced by several factors, such as pH of solution during of precipitation process, aging temperature and type of precipitant. 35 One of the important factors that have a significant effect on precipitation method is the aging time. Aging of the precipitates which obtained by co-precipitation leads to phase changes towards thermodynamically more stable structures.…”

Section: Introductionmentioning

confidence: 99%

Direct conversion of syngas to dimethyl ether as a green fuel over CuO-ZnO-Al2O3/HZSM-5 nanocatalyst: Effect of aging time on physicochemical and catalytic properties

Khoshbin

Haghighi

2015

Journal of Renewable and Sustainable Energy

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The effect of aging time on physicochemical and catalytic properties of CuO-ZnOAl 2 O 3 /HZSM-5 nanocatalyst for direct conversion of syngas to dimethyl ether (DME) has been investigated. Nanocatalysts were synthesized using co-precipitation method in which the aging time varied from 0 to 6 h. The physicochemical properties of the nanocatalysts were studied by X-ray diffraction, Brunauer, Emmett, and Teller, Field Emission Scanning Electron Microscopy (FESEM), energy dispersive X-ray, transmission electron microscopy, FTIR, and temperature-programmed reduction by hydrogen (TPR-H 2 ) techniques. Results showed that the crystallinity of CuO-ZnO-Al 2 O 3 has been increased significantly by increasing of aging time. FESEM analysis showed that, with extension of the aging time, the aggregation of CuO-ZnO-Al 2 O 3 over HZSM-5 has been increased. The size of the particles in the active phase was between 25.0 and 127.1 nm with an average size of 48.36 nm. TPR-H 2 profiles indicated that reducibility of nanocatalysts was enhanced with increasing of aging time. Catalytic performance was investigated at 200-300 C, 10-40 bar, GHSV ¼ 600 cm 3 g/h, and H 2 /CO ¼ 2. It was found that the increase of aging time had a great influence on the activity of nanocatalysts. Moreover, the 6 h aged nanocatalyst displayed the highest catalytic activity. It was also observed that the optimum operating conditions for syngas to DME reaction were 275 C and 40 bar. V C 2015 AIP Publishing LLC. [http://dx.

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“…Hybrid catalysts containing high-silica HMCM-22 zeolites have been used for this process [90]. Bi-functional catalysts made up of a mixture of a methanolsynthesis catalyst and a methanoldehydration catalyst can also be used for this process [90][91][92][93][94][95], a step, which is shown by Equation 21.…”

Section: Syngas To Dmementioning

confidence: 99%

Production of high-value products including gasoline hydrocarbons from the thermochemical conversion of syngas

Street

Yu²

2011

Biofuels

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This article reviews subjects dealing with the chemistry, catalytic poisoning, newer catalyst technologies and possible future solutions to increase the efficiency of creating high-value products by thermochemically converting gasified biomass (producer gas). This article puts emphasis on bi-functional catalysts containing transition metals coupled with zeolites for renewable-fuel production. High-value products such as gasolinerange hydrocarbons, dimethyl ether, aldehydes, isobutane, isobutene and other olefins can be produced with gasified biomass due to the gas containing syngas (H 2 + CO). The chemistry and production of these chemicals are discussed in this article. The importance of certain process variables, such as temperature, space velocity, gas ratios, and pressure are discussed along with the importance of reactor design. The subject of the importance of the cleanliness of the producer gas, so that maximum high-value product yield can be achieved with the greatest efficiency, is also discussed.

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Effect of precipitants during the preparation of Cu-ZnO-Al2O3/Zr-ferrierite catalyst on the DME synthesis from syngas

Cited by 50 publications

References 26 publications

The role of the acidity of alumina prepared by aluminum-carbon black composite for CO hydrogenation to dimethyl ether on hybrid Cu–ZnO–Al2O3/alumina

The role of the acidity of alumina prepared by aluminum-carbon black composite for CO hydrogenation to dimethyl ether on hybrid Cu–ZnO–Al2O3/alumina

Direct conversion of syngas to dimethyl ether as a green fuel over CuO-ZnO-Al2O3/HZSM-5 nanocatalyst: Effect of aging time on physicochemical and catalytic properties

Production of high-value products including gasoline hydrocarbons from the thermochemical conversion of syngas

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