Vapor-phase reaction of polyols over copper catalysts

Ceria has been the subject of thorough investigations, mainly because of its use as an active component of catalytic converters for the treatment of exhaust gases. However, ceria‐based catalysts have also been developed for different applications in organic chemistry. The redox and acid–base properties of ceria, either alone or in the presence of transition metals, are important parameters that allow to activate complex organic molecules and to selectively orient their transformation. Pure ceria is used in several organic reactions, such as the dehydration of alcohols, the alkylation of aromatic compounds, ketone formation, and aldolization, and in redox reactions. Ceria‐supported metal catalysts allow the hydrogenation of many unsaturated compounds. They can also be used for coupling or ring‐opening reactions. Cerium atoms can be added as dopants to catalytic system or impregnated onto zeolites and mesoporous catalyst materials to improve their performances. This Review demonstrates that the exceptional surface (and sometimes bulk) properties of ceria make cerium‐based catalysts very effective for a broad range of organic reactions.

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“…[60] 2.3. Other dehydrations 4-Hydroxy-2-butanone has been converted into 3-buten-2-one over various oxide catalysts at 160 8C.…”

Section: Dehydration Of Diolsmentioning

confidence: 99%

Ceria‐Based Solid Catalysts for Organic Chemistry

Vivier¹,

Duprez²

2010

ChemSusChem

362

244

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“…Conversion of glycerol into useful chemicals is widely studied [6][7][8][9][10][11][12][13][14][15][16]. Most of the works report on converting glycerol into acrolein [6][7][8], acetol [9], or 1,2-and 1,3-propanediol [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Most of the works report on converting glycerol into acrolein [6][7][8], acetol [9], or 1,2-and 1,3-propanediol [10][11][12]. Acrolein and acetol are produced through gas-phase dehydration of glycerol over acidic catalysts including Nb 2 O 5 , heteropolyacids, and zeolites, and copper metal catalysts, 10 respectively.…”

Section: Introductionmentioning

confidence: 99%

Conversion of glycerol into allyl alcohol over potassium-supported zirconia–iron oxide catalyst

Konaka¹,

Tago²,

Yoshikawa³

et al. 2014

Applied Catalysis B: Environmental

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The catalytic conversion of glycerol was performed with iron oxide-based catalysts for production of allyl alcohol using a fixed-bed flow reactor at 623 K under atmospheric pressure.The glycerol dehydration proceeds on acid sites of catalysts while the allyl alcohol production is assumed to be catalyzed by non-acidic sites of catalysts through a hydrogen transfer mechanism.Different alkali metals, including Na, K, Rb, and Cs were supported on ZrO 2 -FeO X and all of them gave impressively higher allyl alcohol yield and suppressed glycerol dehydration due to the reduced catalyst acidic property. K-supported ZrO 2 -FeO X (K/ZrO 2 -FeO X ) was chosen for further studies, and allyl alcohol yield remarkably increased up to 27 mol%-C at the K content of 3-5 mol%. Since no external hydrogen gas is supplied to the system, the hydrogen transfer mechanism should take place between the reaction of glycerol and either hydrogen atoms derived from formic acid forming during the reaction, or active hydrogen species produced from the decomposition of H 2 O by ZrO 2 .Addition of Al 2 O 3 to K/ZrO 2 -FeO X (K/Al 2 O 3 -ZrO 2 -FeO X ) was examined in order to improve structure stability during the glycerol conversion. Al 2 O 3 addition to the catalyst was effective to achieve higher structure stability, leading to high glycerol conversion with stable allyl alcohol yield of above 25 mol%-C. Moreover, K/Al 2 O 3 -ZrO 2 -FeO X can be applicable to the conversion of crude glycerol which is the waste solution obtained from biodiesel production.3

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“…Usually the mixed metal-oxide (predominantly Cu/oxide) catalysts were utilized. The two-stage mechanism of PG obtaining with intermediate acetol formation is considered [3][4][5][6][7][8][9][10][11][12][13][14]. M. Akiyama et al [5] have proposed to use a temperaturegradient reactor for hydrogenation of glycerol.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, many investigators have attended to perspective ways of propylene glycol obtaining via hydrogenation of accessible and low-cost glycerol (GL-PG process) [3][4][5][6][7][8][9][10][11][12][13][14]. Usually the mixed metal-oxide (predominantly Cu/oxide) catalysts were utilized.…”

Section: Introductionmentioning

confidence: 99%

Two-stage Conversion of Glycerol into Propylene Glycol over Cu/Al2O3 Catalyst

Sharanda¹,

Sontsev²,

Bondarenko³

et al. 2015

ChChT

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Abstract. The conversion of 30 % glycerol mixture in ethanol over Cu/Al 2 O 3 catalyst at 493 K/0.1MPa was studied under Ar-H 2 flow with different H 2 content. It was shown, that 84 % selectivity towards hydroxyacetone is achieved at using 2.5 % H 2 concentration in a carrier gas. Then the product obtained at 493 K has been hydrogenated into a propylene glycol at 448 K in pure H 2 flow under 1.2 MPa. 89 % selectivity towards propylene glycol was achieved at moderate consumption of hydrogen H 2 /C 3 H 6 O 2 = 4 (mol). Two-stage conversion of glycerol into the propylene glycol at different pressure is proposed.

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Vapor-phase reaction of polyols over copper catalysts

Cited by 160 publications

References 36 publications

Ceria‐Based Solid Catalysts for Organic Chemistry

Ceria‐Based Solid Catalysts for Organic Chemistry

Conversion of glycerol into allyl alcohol over potassium-supported zirconia–iron oxide catalyst

Two-stage Conversion of Glycerol into Propylene Glycol over Cu/Al2O3 Catalyst

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