CO hydrogenation to higher alcohols over CuZnAl catalysts without promoters: Effect of pH value in catalyst preparation

Liu, Yongjun; Deng, Xuan; Han, Peide; Huang, Wei

doi:10.1016/j.fuproc.2017.08.012

Cited by 24 publications

(14 citation statements)

References 33 publications

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“…The excellent C 2+ alcohols selectivity and yield are obtained over the catalyst with weight ratio of Cu/Co = 0.5-2. Taking high C 2+ alcohols selectivity, low CO 2 selectivity and narrowed alcohols distribution into consideration, carbon nanotubesupported copper-cobalt catalyst turns to be better than CuZnAl 26 and Cu-Co/Mn 2 O 3 -Al 2 O 3 27 catalyst recently reported for higher alcohols synthesis.…”

Section: Catalytic Performance Evaluationmentioning

confidence: 98%

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

Wang

Zhuang

et al. 2017

J. Braz. Chem. Soc.

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A series of carbon nanotube (CNTs)-supported copper-cobalt catalysts were prepared and investigated in a slurry reactor for their ability to selectively convert syngas into higher carbon number alcohols. The 7.5Cu7.5Co/CNTs catalyst achieved superior selectivity towards the formation of ethanol (30.1%) and C 2+ alcohols (57.7%), while the 10Co5Cu/CNTs catalyst exhibited the largest alcohol space-time yield (372.9 mg g cat -1 h -1). However, the pure Cu (15Cu/CNTs) catalyst displayed negligible activity. Cobalt reduction was enhanced in the presence of copper. In addition to the Cu 0 -Co 0 center, Co 0 -Co 2+ also presented dual active sites for higher alcohols synthesis, the Co 2+ site could terminate carbon chain growth to produce alcohols. The ratio of Cu/Co considerably influences the metal particle properties-synergistically effecting the active species.

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Section: Catalytic Performance Evaluationmentioning

confidence: 98%

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

Wang

Zhuang

et al. 2017

J. Braz. Chem. Soc.

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“…Figure 2 shows, for the Ni catalyst, the evolution of the conversion level with time at constant hydrogen pressure (10 bars), temperature (363 K ) and weight of catalyst (50 g). Percent conversion was measured using dimethyl-nitrobenzene in the range 1-3 mol in 3500 cm 3 ethanol. After reaction time of 210 min, it was observed that with an increase in substrate concentration (dimethyl-nitrobenzene) percent conversion increased almost linearly up to 2.7 mol of dimethyl-aniline then surprisingly started decreasing.…”

Section: Effect Of the Dimethyl-nitrobenzene Concentrationmentioning

confidence: 99%

“…However, most of them lack the chemoselectivity over other functional groups and reduction of aromatic nitro compounds often yield a mixture of products. In addition, the reactions are performed in organic solvents or in the presence of acids, which pose wastehandling problems [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Hydrogenation of Dimethyl-Nitrobenzene to Dimethyl-Aniline in a Three-Phase Reactor: Reaction Kinetics and Operation Condition

Kazemimoghadam¹

2017

AJPC

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Abstract:The catalytic transfer hydrogenation of dimethyl-nitrobenzene (DN) to Dimethyl-aniline (DA) was studied in the temperature range 343-403 K , pressure range of 4-10 bar H 2 and ethanol as solvent using Ni on alumina-silicate as catalyst above agitation speed 800 rpm. The substrate feed concentration was varied in the range from 0.124 to 0.745 kmol/m 3 while catalyst loading was in the range 4-12% (w/w) of dimethyl-nitrobenzene. Dimethyl-aniline was the only reaction product, generated through the hydrogenation of the Nitro group of dimethyl-nitrobenzene. The effects of hydrogen partial pressure, catalyst loading, dimethyl-nitrobenzene concentration and temperature on the reaction conversion have been reported. Near first-order dependence on dimethyl-nitrobenzene concentration and hydrogen pressure were observed for the initial rate of dimethyl-nitrobenzene hydrogenation over the Ni catalyst. Furthermore, an increase in the catalytic activity as the reaction temperature, pressure and weight of catalysts was observed. Conventional Arrhenius behavior was exhibited by catalyst, Ni showed activation energies of 808 J/mol.

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“…The Cu/ZnO based catalysts are widely applied on various catalytic reactions involving synthesis of alcohols . Studies on the phases of Cu‐containing hydroxycarbonates revealed that some precursor phases play important role for the catalytic performance .…”

Section: Introductionmentioning

confidence: 99%

Oriented Isomorphous Substitution: An Efficient and Alternative Route to Fabricate the Zn Rich Phase Pure (Cu_1−x,Zn_x)₂(OH)₂CO₃ Precursor Catalyst for Methanol Synthesis

et al. 2020

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A new methodology has been demonstrated for the synthesis of a series of phase pure (Cu1−x,Znx)2(OH)2CO3 precursors by isomorphous substitution of Zn2+ in the malachite structure. By following the present protocol, it was possible to synthesize the pure phase (Cu1−x,Znx)2(OH)2CO3 with substitution level as high as x=0.5, which is better than the maximum possible value achieved by coprecipitation method, i. e. x=0.31. The isomorphous substitution by Zn2+ leads to the change in the morphology of malachite crystals from flake‐like to regular needle‐like shape with high Zn dispersion. The activity of the calcined catalysts was increased by ∼1.5–1.7 fold for the hydrogenation of syngas to methanol as compared with those prepared from the traditional coprecipitation route. The synergy between Cu and ZnO was further demonstrated quantitatively by characterization of the catalysts treated with syngas at 250 °C.

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CO hydrogenation to higher alcohols over CuZnAl catalysts without promoters: Effect of pH value in catalyst preparation

Cited by 24 publications

References 33 publications

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

Catalytic Hydrogenation of Dimethyl-Nitrobenzene to Dimethyl-Aniline in a Three-Phase Reactor: Reaction Kinetics and Operation Condition

Oriented Isomorphous Substitution: An Efficient and Alternative Route to Fabricate the Zn Rich Phase Pure (Cu_1−x,Zn_x)₂(OH)₂CO₃ Precursor Catalyst for Methanol Synthesis

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CO hydrogenation to higher alcohols over CuZnAl catalysts without promoters: Effect of pH value in catalyst preparation

Cited by 24 publications

References 33 publications

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

Catalytic Hydrogenation of Dimethyl-Nitrobenzene to Dimethyl-Aniline in a Three-Phase Reactor: Reaction Kinetics and Operation Condition

Oriented Isomorphous Substitution: An Efficient and Alternative Route to Fabricate the Zn Rich Phase Pure (Cu1−x,Znx)2(OH)2CO3 Precursor Catalyst for Methanol Synthesis

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Oriented Isomorphous Substitution: An Efficient and Alternative Route to Fabricate the Zn Rich Phase Pure (Cu_1−x,Zn_x)₂(OH)₂CO₃ Precursor Catalyst for Methanol Synthesis