Factors Affecting the Activity and Selectivity of Alumina Catalysts in the Dehydration of 1-Butanol

Ashour, Sheikha S.

doi:10.1260/0263617042879528

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…Zinc, manganese, and cobalt oxides exhibited high activity in alcohol dehydration, as already proven [15][16][17]29]. The modification of metal ions improved the acidity of the catalyst, and the Lewis acid sites played an important role in the catalytic dehydration of alcohols [30]. A synergistic effect between different metal ions and catalyst carriers improved the catalytic efficiency [23,31].…”

Section: Catalytic Activity Of γ-Al2o3 and Zn-mn-co/γ-al2o3supporting

confidence: 56%

Efficient Catalytic Dehydration of High-Concentration 1-Butanol with Zn-Mn-Co Modified γ-Al2O3 in Jet Fuel Production

Liu

Yan

et al. 2019

Catalysts

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It is important to develop full-performance bio-jet fuel based on alternative feedstocks. The compound 1-butanol can be transformed into jet fuel through dehydration, oligomerization, and hydrogenation. In this study, a new catalyst consisting of Zn-Mn-Co modified γ-Al2O3 was used for the dehydration of high-concentration 1-butanol to butenes. The interactive effects of reaction temperature and butanol weight-hourly space velocity (WHSV) on butene yield were investigated with response surface methodology (RSM). Butene yield was enhanced when the temperature increased from 350 °C to 450 °C but it was reduced as WHSV increased from 1 h−1 to 4 h−1. Under the optimized conditions of 1.67 h−1 WHSV and 375 °C reaction temperature, the selectivity of butenes achieved 90%, and the conversion rate of 1-butanol reached 100%, which were 10% and 6% higher, respectively, than when using unmodified γ-Al2O3. The Zn-Mn-Co modified γ-Al2O3 exhibited high stability and a long lifetime of 180 h, while the unmodified γ-Al2O3 began to deactivate after 60 h. Characterization with X-ray diffraction (XRD), nitrogen adsorption-desorption, pyridine temperature-programmed desorption (Py-TPD), pyridine adsorption IR spectra, and inductively coupled plasma atomic emission spectrometry (ICP-AES), showed that the crystallinity and acid content of γ-Al2O3 were obviously enhanced by the modification with Zn-Mn-Co, and the loading amounts of zinc, manganese, and cobalt were 0.54%, 0.44%, and 0.23%, respectively. This study provides a new catalyst, and the results will be helpful for the further optimization of bio-jet fuel production with a high concentration of 1-butanol.

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Section: Catalytic Activity Of γ-Al2o3 and Zn-mn-co/γ-al2o3supporting

confidence: 56%

Efficient Catalytic Dehydration of High-Concentration 1-Butanol with Zn-Mn-Co Modified γ-Al2O3 in Jet Fuel Production

Liu

Yan

et al. 2019

Catalysts

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“…With an increase in the temperature, selectivity toward 1-butene increases over dibutyl ether, and ether production becomes minimal above 400 °C . At high temperatures, such bimolecular reactions are generally slower than the monomolecular reactions leading to the production of alkenes …”

Section: Reactions Involvedmentioning

confidence: 99%

“…17 At high temperatures, such bimolecular reactions are generally slower than the monomolecular reactions leading to the production of alkenes. 30 Dehydration of Acetone. The above reaction products are based on experimental results as no specific reaction mechanism was found for the γ-Al 2 O 3 catalyzed dehydration of acetone in the literature.…”

Section: Reactions Involvedmentioning

confidence: 99%

Conversion of the Acetone–Butanol–Ethanol (ABE) Mixture to Hydrocarbons by Catalytic Dehydration

Nahreen

Gupta

2013

Energy Fuels

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An acetone−butanol−ethanol (ABE) mixture, containing 62.9 wt % n-butanol, 29.3 wt % acetone, and 7.8 wt % ethanol, can be produced from biomass through the well-established ABE fermentation process using genetically modified Clostridium acetobutylicum. In this work, the catalytic dehydration reactions of the ABE mixture are studied to deoxygenate the mixture. A feed of the ABE mixture was preheated and pumped through a catalytic packed bed tubular reactor in a continuous process at pressures of 3−13 bar. Experiments were run at different operating temperatures and feed flow rates to observe the effect on the dehydration products, which are mixtures of three phases: (1) a gas phase consisting of light hydrocarbons and carbon dioxide, (2) an organic liquid phase consisting of heavy hydrocarbons, and (3) an aqueous phase with dissolved oxygenated hydrocarbons. The products were analyzed and compared to those from the dehydration of pure n-butanol, acetone, and ethanol feedstocks. The conversion is examined on two different catalysts: an alumina (γ-Al 2 O 3 ) and a zeolite (ZSM-5). The dehydration products from the ABE mixture are mostly unsaturated hydrocarbon chains in the range of C 2 −C 16 . On the basis of the higher heating values (HHV) of the liquid products and infrared spectra of the gas products, it can be concluded that the products from the ABE feedstock are different from those from the individual components, which suggests a cross reactivity of the components during the reaction. HHV of the liquid product increases with a decrease in the feed flow rate, and the γ-Al 2 O 3 catalyst is better than ZSM-5 for getting a good conversion of ABE in terms of liquid product energy content at a moderate reaction time.

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Synthesis of spherical structured catalysts by dip‐coating: Application to n‐butane dehydrogenation

2017

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This work analyzes the deposition conditions of thin layers of γ‐Al2O3 by dip‐coating on a spherical substrate of α‐Al2O3 spheres. Results showed that under controlled deposition conditions, a structured support of α‐Al2O3 spheres coated by a uniform γ‐Al2O3 layer (thickness ≈ 15 µm) of good adherence can be attained. Optimal preparation conditions for the coating, that involved pretreatment of the substrate, gel formation, deposition conditions, and thermal treatments, were obtained. Pt catalysts supported on this structured material can be used as promising dehydrogenation systems. In this sense, a monometallic structured catalyst showed both good metallic dispersion and catalytic performance in n‐butane dehydrogenation reaction compared to another conventional catalytic system.

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Factors Affecting the Activity and Selectivity of Alumina Catalysts in the Dehydration of 1-Butanol

Cited by 5 publications

References 17 publications

Efficient Catalytic Dehydration of High-Concentration 1-Butanol with Zn-Mn-Co Modified γ-Al2O3 in Jet Fuel Production

Efficient Catalytic Dehydration of High-Concentration 1-Butanol with Zn-Mn-Co Modified γ-Al2O3 in Jet Fuel Production

Conversion of the Acetone–Butanol–Ethanol (ABE) Mixture to Hydrocarbons by Catalytic Dehydration

Synthesis of spherical structured catalysts by dip‐coating: Application to n‐butane dehydrogenation

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