Ethylene from ethanol over zeolite catalysts

Mao, R. Le Van; Levesque, P.; McLaughlin, G.; Dao, Lê H.

doi:10.1016/s0166-9834(00)82453-7

Cited by 77 publications

(64 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We performed no long term experiments in this field. From the literature it is known that H-ZSM-5 is dealuminated upon steam treatment [64] and a drop in activity is observed after a few reactiodregeneration cycles in the presence of very dilute aqueous solutions of ethanol [44]. It appears that with zeolites as catalysts a separation step to yield highly concentrated ethanol solutions is unavoidable.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Conversion of ethanol over zeolite H‐ZSM‐5

Schulz¹,

Bandermann²

1994

Chem Eng & Technol

View full text Add to dashboard Cite

The conversion of ethanol over H-ZSM-5 was studied as a function of ethanol partial pressure, reaction temperature, weight hourly space velocity and %/A1 ratio. The results obtained were in qualitative agreement with most of those in the literature. Combination with all published results to give a significant regression model was not possible due to the large scatter of the data from various scientific groups. In mechanistic investigations, temperature programmed reaction measurements of ethanol, diethyl ether and ethene were performed. The formation of ethene from ethanol via direct elimination or from diethyl ether as intermediate could be confirmed. In the conversion of ethanol/water mixtures, the product distribution did not change significantly up to a water content of 60 wt%. Then, a pronounced increase of ethene formation and a considerable decrease of the yields of, aromatics was observed. When several reaction mixtures from syngas conversion to ethanol were converted over H-ZSM-5, the coking rate depended on the product distribution in the feed. Product mixtures from processes with higher amounts of compounds having an unfavourable C/H ratio led to rapid deactivation of the zeolite.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Our results can only be compared with those of Oudejans et al [22], Costa et al [37] and Le van Mao et al [44], because only these authors also varied the water content in the ethanol feed over a wider range, i.e. from 0 to 61, from 4 to 30 and from 0 to 75 wt%, respectively.…”

mentioning

confidence: 88%

Conversion of ethanol over zeolite H‐ZSM‐5

Schulz¹,

Bandermann²

1994

Chem Eng & Technol

View full text Add to dashboard Cite

show abstract

“…Accordingly, the HZSM-5 zeolite is effective below 300 C and has been used with different modifications aimed at moderating its acid strength to avoid secondary reactions of ethylene conversion and to attenuate coke formation. [16][17][18][19][20] However, propylene and butene production takes place by transformation of ethylene through a oligomerization-cracking mechanism that requires temperatures above 350 C. [21][22][23] The main difficulty of this process is catalyst deactivation, although a distinction must be made between reversible deactivation (due to coke deposition) and the zeolite irreversible deactivation due to water content in the reaction medium (dealuminization). 24 In a previous study, the good performance of a catalyst based on a HZSM-5 zeolite treated with 0.2 M NaOH solution for 10 min has been proven.…”

Section: Introductionmentioning

confidence: 99%

Deactivation kinetics of a HZSM‐5 zeolite catalyst treated with alkali for the transformation of bio‐ethanol into hydrocarbons

et al. 2011

View full text Add to dashboard Cite

The kinetics of deactivation by coke of a HZSM-5 zeolite catalyst in the transformation of bioethanol into hydrocarbons has been studied. To attenuate deactivation, the following treatments have been carried out: (i) the zeolite has been subjected to a treatment with alkali to reduce the acid strength of the sites and (ii) it has subsequently been agglomerated into a macro and meso-porous matrix of bentonite and alumina. The experimental study has been conducted in a fixed bed reactor under the following conditions: temperature, between 300 and 400 C; pressure, 1 atm; space-time, up to 1.53 (g of catalyst) h (g of ethanol) À1; particle size of the catalyst, between 0.3 and 0.6 mm; feed flowrate, 0.16 cm 3 min À1 of ethanolþwater and 30 cm 3 (NC) min À1of N 2 ; water content in the feed, up to 75 wt %; time on stream, up to 31 h. The expression for deactivation kinetics is dependent on the concentration of hydrocarbons and water in the reaction medium (which attenuates the deactivation) and, together with the kinetics at zero time on stream, allows the calculation of the evolution with time on stream of the yields and distribution of products (ethylene, propylene and butenes, C 1 -C 3 paraffins, and C 4 -C 12 ). By increasing the temperature in the 300-400 C range the role of ethylene on coke deposition is more significant than that of the other hydrocarbons (propylene, butenes and C 4 -C 12 ), which contribute to a greater extent to the formation of coke at 300 C.

show abstract

“…At present, the authors are studying the dehydration of ethanol into ethylene. It is well known that this dehydration is catalyzed by various solid acid catalysts such as silica-alumina and zeolites [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Dehydration of Ethanol into Ethylene over Solid Acid Catalysts

et al. 2005

View full text Add to dashboard Cite

The dehydration of ethanol into ethylene was investigated over various solid acid catalysts, such as zeolites and silica-alumina, at temperatures ranging 453-573 K under atmospheric pressure. Ethylene was produced via diethyl ether during the dehydration process. H-mordenites were the most active for the dehydration. It was suggested that the catalyst activity could be correlated with the number of strong Brønsted acid sites in the catalyst. Further, the H-mordenite was more stable with a SiO 2 /Al 2 O 3 ratio of 90 than with a SiO 2 /Al 2 O 3 ratio of 20.

show abstract

Ethylene from ethanol over zeolite catalysts

Cited by 77 publications

References 8 publications

Conversion of ethanol over zeolite H‐ZSM‐5

Conversion of ethanol over zeolite H‐ZSM‐5

Deactivation kinetics of a HZSM‐5 zeolite catalyst treated with alkali for the transformation of bio‐ethanol into hydrocarbons

Dehydration of Ethanol into Ethylene over Solid Acid Catalysts

Contact Info

Product

Resources

About