Butadiene from Ethanol. Reaction Mechanism

Jones, Howard; Stahly, E. E.; Corson, B. B.

doi:10.1021/ja01173a084

Cited by 59 publications

(48 citation statements)

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“…Fig. 11 The ion intensity of BD with mole ratio of feed In the experiment of impulse response, the mixed ethanol-acetaldehyde feed leading to BD formation, as reported by the Soviet and American workers [7]. So the ethanol was fed after the acetaldehyde.…”

Section: The Drifts Of Acetaldehyde Reaction On the Mgo/sio 2 Catalystmentioning

confidence: 77%

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Study on the Mechanism of Butadiene Formation from Ethanol

et al. 2014

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An specific investigation has been carried out on the mechanism of the catalytic conversion of ethanol to 1,3-butadiene on magnesia-silica acidic-basic bifunctional catalysts. The magnesia-silica catalyst was prepared by wet-kneading and the reaction process was detected through Impulse Response and Diffuse Reflectance Infrared Fourier Transform Spectroscopy. The mechanism of 1,3-butadiene formation from ethanol was demonstrated through experiment in this time, and the process was proved as follows: Firstly, ethanol was dehydrogenated to form acetaldehyde; Then condensation of acetaldehyde formed acetaldol; Then dehydration of acetaldol to croton aldehyde; Finally, ethanol was involved a second time in a hydrogen transfer reaction with croton aldehyde to form 1,3-butadiene.

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Section: The Drifts Of Acetaldehyde Reaction On the Mgo/sio 2 Catalystmentioning

confidence: 77%

“…At the mechanistic point of view, the one-step of ethanol to BD is extremely complicated and is still a debatable subject. Gorin [7] suggests that the reaction mechanism may be represented as follows:…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanism of Butadiene Formation from Ethanol

et al. 2014

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“…First, the supposed intermediate acetaldol is seldom detected amongst the products of the reaction, arguably due to its facile dehydration. Second, the engineers at Union Carbide Corporation have reported that acetaldol was converted back to acetaldehyde when fed together with ethanol into a reactor packed with a 2% Ta/SiO2 catalyst without producing butadiene [15]. This suggests that …”

Section: The Kagan Mechanismmentioning

confidence: 99%

Recent Breakthroughs in the Conversion of Ethanol to Butadiene

et al. 2016

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1,3-Butadiene is traditionally produced as a byproduct of ethylene production from steam crackers. What is unusual is that the alternative production route for this important commodity chemical via ethanol was developed a long time ago, before World War II. Currently, there is a renewed interest in the production of butadiene from biomass due to the general trend to replace oil in the chemical industry. This review describes the recent progress in the production of butadiene from ethanol (ETB) by one or two-step process through intermediate production of acetaldehyde with an emphasis on the new catalytic systems. The different catalysts for butadiene production are compared in terms of structure-catalytic performance relationship, highlighting the key issues and requirements for future developments. The main difficulty in this process is that basic, acid and redox properties have to be combined in one single catalyst for the reactions of condensation, dehydration and hydrogenation. Magnesium and zirconium-based catalysts in the form of oxides or recently proposed silicates and zeolites promoted by metals are prevailing for butadiene synthesis with the highest selectivity of 70% at high ethanol conversion. The major challenge for further application of the process is to increase the butadiene productivity and to enhance the catalyst lifetime by suppression of coke deposition with preservation of active sites.

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“…(8)); and dehydration of crotyl alcohol to obtain 1,3-butadiene (Eq. (9)) [Makshina, 2012;Jones, 2011;Kvisle, 1988;Toussaint, 1947;Jones, 1949]. Nevertheless, to obtain the true kinetic behavior for this complex system of reactions it is necessary to conduct further studies involving the identification and monitoring of intermediate species of the reaction by analytical techniques in situ.…”

Section: Characterizationmentioning

confidence: 99%

VAPOR-PHASE CATALYTIC CONVERSION OF ETHANOL INTO 1,3-BUTADIENE ON Cr-Ba/MCM-41 CATALYSTS

La-Salvia

Lovón-Quintana

Valença

2015

Braz. J. Chem. Eng.

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-Al-MCM-41, 16%Ba/Al-MCM-41 and 1.4%Cr-16%Ba/Al-MCM-41 were used as catalysts in the vapor-phase catalytic conversion of ethanol. Physical-chemical properties of the catalysts and the effect of barium and chromium on the Al-MCM-41 activity and 1,3-butadiene yield were studied. The catalysts were characterized by X-ray diffraction (XRD), N 2 physisorption (BET method), CO 2 chemisorption and Fourier transform infrared spectroscopy (FT-IR). When ethanol was completely converted on Al-MCM-41 and 16%Ba/Al-MCM-41, the reaction products showed a high selectivity for ethylene (90-98%). However, on the 1.4%Cr-16%Ba/Al-MCM-41 catalyst, a greater number of reaction products were obtained such as ethylene, acetaldehyde, diethyl ether and 1,3-butadiene. The maximum 1,3-butadiene yield obtained from ethanol reaction was 25% at 723 K and W/F EtOH = 15 g h mol -1 . The latter result was obtained in a single step and without addition of reaction promoters (e.g., acetaldehyde, crotonaldehyde, hydrogen) in the feed stream to the reactor.

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Butadiene from Ethanol. Reaction Mechanism

Cited by 59 publications

References 0 publications

Study on the Mechanism of Butadiene Formation from Ethanol

Study on the Mechanism of Butadiene Formation from Ethanol

Recent Breakthroughs in the Conversion of Ethanol to Butadiene

VAPOR-PHASE CATALYTIC CONVERSION OF ETHANOL INTO 1,3-BUTADIENE ON Cr-Ba/MCM-41 CATALYSTS

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