Catalytic Dehydration of Ethanol to Ethylene over Alkali-Treated HZSM-5 Zeolites

Sheng, Qingtao; Guo, Shaojun; Ling, Kai Cheng; Zhao, Lei

doi:10.5935/0103-5053.20140118

Cited by 10 publications

(13 citation statements)

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“…At high temperatures, the main reaction product is ethylene which Varisli et al [36] suggest could result from the decomposition of diethyl ether. Sheng et al [37] have also reported that high reaction temperatures favor the production of ethylene while at low reaction temperatures diethyl ether formation is favored, consistent with the results obtained in this work. In these tests, there was no acetaldehyde production which indicated that there were no basic sites in the catalysts or if they existed they do not have the sufficient strength to direct the reaction toward the dehydrogenation of the alcohol.…”

Section: Ethanol Dehydration Reactionsupporting

confidence: 92%

Porous Silicates Modified with Zirconium Oxide and Sulfate Ions for Alcohol Dehydration Reactions

Benito

García-Alamilla

Enríquez

et al. 2015

Advances in Materials Science and Engineering

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Porous silicates were synthesized by a nonhydrothermal method, using sodium silicate as a source of silica and cetyltrimethylammonium bromide as a template agent. Catalysts were characterized using thermogravimetric analysis, N2physisorption, X-ray diffraction, FTIR spectroscopy, pyridine adsorption, potentiometric titration withn-butylamine, scanning electronic microscopy, and transmission electronic microscopy. The surface area of the materials synthesized was greater than 800 m2/g. The introduction of zirconium atoms within the porous silicates increased their acid strength from −42 to 115 mV, while the addition of sulfate ions raised this value to 470 mV. The catalytic activity for the dehydration of alcohols yields conversions of up to 70% for ethanol and 30% for methanol.

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Section: Ethanol Dehydration Reactionsupporting

confidence: 92%

Porous Silicates Modified with Zirconium Oxide and Sulfate Ions for Alcohol Dehydration Reactions

Benito

García-Alamilla

Enríquez

et al. 2015

Advances in Materials Science and Engineering

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“…ZM‐AT1 retained most of the crystallinity of the parent sample, whereas ZM‐AT2 decreased to 64%. This is probably because of the collapse of the zeolite crystal structure occurred after some degree of desilication …”

Section: Resultsmentioning

confidence: 99%

“…This is probably because of the collapse of the zeolite crystal structure occurred after some degree of desilication. 29 The SEM and TEM images ( Fig. 2) were conducted to investigate the morphology and inner structure changes in zeolite crystals.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Performances of Hierarchical Structured HZSM‐5 Washcoating on Stainless‐Steel Substrates

et al. 2016

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The washcoats of the hierarchical HZSM‐5 zeolite (through desilication) were prepared on the inner surface of SS304 stainless‐steel tubes. The properties of slurries and coatings were characterized by analysis of particle size, measurements of rheological property, loading, adhesion, and finally the catalytic cracking test. It was found that introducing mesoporosity on the zeolite crystals was beneficial for reducing the particle size during ball milling for slurries preparation, which was helpful for improving loading due to a significant change in the rheological property. As the interaction between the particles with different sizes was enhanced after ball milling, the adhesion of the prepared coatings was improved. The catalytic activity and stability of the hierarchical HZSM‐5 coatings for the catalytic cracking of n‐dodecane were 56% and 75% higher than that of the conventional one, respectively. This probably resulted from the enhanced diffusion rate of reactant and products in the crystals and the coatings.

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“…Attempts to stabilise the catalyst with alkali additives were not effective. By contrast, by increasing pore size the residence time in the pores can be decreased, so improving catalyst life, as in the case of the present BEA catalysts [68,69].…”

Section: -Durability Testmentioning

confidence: 86%

Ethylene production via catalytic dehydration of diluted bioethanol: A step towards an integrated biorefinery

Rossetti

Compagnoni

Finocchio

et al. 2017

Applied Catalysis B: Environmental

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After a preliminary thermodynamic investigation, proper operating conditions have been selected to maximise ethylene productivity by ethanol dehydration and limit side products such as coke and higher olefins or oxygenates. We focused on the possibility to operate with a diluted bioethanol solution (ca. 50 wt%), which represents a promising and convenient raw material, obtainable by simple flash concentration of the fermentation broth. Furthermore, water addition to the ethanol dehydration reactor may help preventing catalyst coking and diethyl ether formation, although affecting the thermodynamic products distribution. A proof of concept for an ethanol dehydration process using diluted ethanol is also provided through process simulation. Catalysts based on a BEA zeolite have been compared, characterised by different acidity imparted by dealumination treatments. Ni addition in variable loading helped suppressing undesired byproducts, difficult to separate from ethylene. For instance, no trace of diethyl ether nor acetaldehyde has been observed for the Ni-loaded samples under optimised working conditions. Catalyst characterisation by FT IR allowed correlating a high selectivity to ethylene with the acid sites nature of the catalyst, whereas the presence of extraframework Lewis acidic sites induced faster coke formation. Durability was finally checked on the most active and selective catalyst evidencing stable operation for 80 h-on-stream and without evidence of coke deposition, as determined after characterisation of the spent samples. A γ-Al2O3 catalyst has been tested as benchmark under the same conditions

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Catalytic Dehydration of Ethanol to Ethylene over Alkali-Treated HZSM-5 Zeolites

Cited by 10 publications

References 0 publications

Porous Silicates Modified with Zirconium Oxide and Sulfate Ions for Alcohol Dehydration Reactions

Porous Silicates Modified with Zirconium Oxide and Sulfate Ions for Alcohol Dehydration Reactions

Preparation and Performances of Hierarchical Structured HZSM‐5 Washcoating on Stainless‐Steel Substrates

Ethylene production via catalytic dehydration of diluted bioethanol: A step towards an integrated biorefinery

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