Importance of oxygen surface groups in catalytic dehydration and dehydrogenation of butan-2-ol promoted by carbon catalysts

Szymański, G.; Rychlicki, Gerhard

doi:10.1016/0008-6223(91)90112-v

Cited by 59 publications

(30 citation statements)

References 27 publications

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“…26 The evolution of the 2-butanol conversion and selectivities to different products with time on stream (TOS) at 568 K is shown in Figure 5. A very small change in conversion (from 96.8 to 93%), and selectivities is observed for the catalyst after 26 h on stream.…”

Section: -Butanol Decompositionmentioning

confidence: 99%

“…acidity of carbon catalysts for alcohol decomposition reactions, the carbons were usually oxidized in a supplementary step with different chemical compounds in order to introduce oxygen surface complexes of acidic character. 24,25,26 This increase in the surface acidity is associated with the formation of carboxylic and lactonic groups, which show a low to moderate thermal stability. 27 Chemical activation with phosphoric acid results in carbons with high surface acidity as a consequence of the oxygen-phosphorus groups formed on the carbon surface during the activation process.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic study of the decomposition of 2‐butanol on carbon‐based acid catalyst

et al. 2009

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in Wiley InterScience (www.interscience.wiley.com).The catalytic conversion of 2-butanol on a carbon-based acid catalyst prepared by chemical activation of olive stone with phosphoric acid was investigated. The carbon catalyst showed a considerable amount of surface phosphorus, presumably in form of phosphate groups, as revealed by XPS, despite a washing step carried out after the activation process. Conversion of 2-butanol yields mainly dehydration products, mostly cis-2-butene and trans-2-butene with lower amounts of 1-butene, and a very small amount of mek as dehydrogenation product. Kinetic interpretation of the experimental data was performed using two elimination mechanisms for the dehydration reaction; an E1-mechanism (two-step mechanism) and an E2-mechanism (one-step mechanism). The rate expressions derived from both models fit properly the experimental results, suggesting that probably the two mechanisms occur simultaneously. This is supported by the similar rate constant obtained for the formation of the carbocation and the olefins in the E1 and E2 mechanisms, respectively. V

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Section: -Butanol Decompositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetic study of the decomposition of 2‐butanol on carbon‐based acid catalyst

et al. 2009

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“…The literature on the alcohol decomposition on activated carbons is rather scarce, although it has been proved that activated carbons can catalyse many chemical reactions [16] including alcohol decomposition. The most attention has been devoted to the reactions of butanol, isopropanol, ethanol or methanol [17][18][19][20][21][22][23][24][25][26]. It has been found that the dehydration activity of carbons results from the presence of carboxyl groups of varying acid strength, whereas the dehydrogenation activity results from the simultaneous presence of Lewis acid and Lewis base sites [17,18].…”

Section: Introductionmentioning

confidence: 98%

“…The most attention has been devoted to the reactions of butanol, isopropanol, ethanol or methanol [17][18][19][20][21][22][23][24][25][26]. It has been found that the dehydration activity of carbons results from the presence of carboxyl groups of varying acid strength, whereas the dehydrogenation activity results from the simultaneous presence of Lewis acid and Lewis base sites [17,18]. Moreover, only those carboxyl groups that are characterised by low thermal resistance [21] or those that are easily accessible to the reagents [20] show catalytic activity in the reaction of dehydration.…”

Section: Introductionmentioning

confidence: 99%

Activated Carbon Modified with Different Chemical Agents as a Catalyst in the Dehydration and Dehydrogenation of Isopropanol

2008

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Activated carbons modified with different chemical agents such as HNO 3 , H 2 SO 4 , peroxyacetic acid (PAA), air, NH 3 and Cl 2 have been tested as catalysts in decomposition (dehydration and dehydrogenation) of isopropanol. The majority of the samples obtained have been characterised by well-developed microporous surface with a small contribution of mesopores (8-18%). The influence of the surface area of the samples on their catalytic performance has been insignificant. The carbon oxidation with oxidants in the liquid or gas phase leads to an increased catalytic activity and the dominant process is dehydration of the alcohol studied. Carbon modification by contact with gas ammonia or chlorine results in a decrease in the catalytic activity and a significant increase in the contribution of dehydrogenation of isopropanol. It has been shown that such behaviour of the catalysts has been a consequence of changes in the acid-base character of the carbons induced by their modification.

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“…As it is known, carbon materials catalyze dehydration and/or dehydrogenation of aliphatic alcohols [16][17][18][19][20]. The decomposition of ethanol on solid catalysts typically occurs through competing reactions [8,10,21]: (1) intermolecular dehydration, which gives diethyl ether (DEE) and water; (2) intramolecular dehydration, which yields ethylene and water; (3) dehydrogenation, which produces acetaldehyde and hydrogen; and (4) total decomposition into CO, H 2 , CH 4 , C, and O [7].…”

Section: Introductionmentioning

confidence: 99%

Bioethanol Transformations Over Active Surface Sites Generated on Carbon Nanotubes or Carbon Nanofibers Materials

Almohalla¹,

Morales²,

Asedegbega–Nieto³

et al. 2014

TOCATJ

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Catalytic bioethanol transformations over carbon nanomaterials (nanofibers and nanotubes) have been evaluated at atmospheric pressure and in the temperature range of 473-773 K. The pristine carbon materials were compared with these samples after surface modification by introducing sulfonic groups. The specific activity for ethanol dehydrogenation, yielding acetaldehyde, increases with the surface graphitization degree for these materials. This suggests that some basic sites can be related with specific surface graphitic structures or with the conjugated basic sites produced after removing acidic oxygen surface groups. Concerning the dehydration reaction over sulfonated samples, it is observed that catalytic activities are related with the amount of incorporated sulfur species, as detected by the evolution of SO 2 in the Temperature programmed Desorption (TPD) as well as by the analysis of sulfur by X-Ray Photoelectron Spectroscopy (XPS).

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Importance of oxygen surface groups in catalytic dehydration and dehydrogenation of butan-2-ol promoted by carbon catalysts

Cited by 59 publications

References 27 publications

Kinetic study of the decomposition of 2‐butanol on carbon‐based acid catalyst

Kinetic study of the decomposition of 2‐butanol on carbon‐based acid catalyst

Activated Carbon Modified with Different Chemical Agents as a Catalyst in the Dehydration and Dehydrogenation of Isopropanol

Bioethanol Transformations Over Active Surface Sites Generated on Carbon Nanotubes or Carbon Nanofibers Materials

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