Guerbet condensation of methanol with n-propanol to isobutyl alcohol over heterogeneous copper chromite/Mg–Al mixed oxides catalysts

Carlini, Carlo; Flego, C.; Marchionna, Mario; Noviello, Marilena; Galletti, Anna Maria Raspolli; Sbrana, Glauco; Basile, Francesco; Vaccari, Angelo

doi:10.1016/j.molcata.2004.05.034

Cited by 50 publications

(49 citation statements)

References 27 publications

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“…Strong acid sites are to be avoided due to their dehydration properties, yet a moderate amount of acidity facilitates coupling of the intermediates. 95,115,187 187 Carlini et al 82 substituted Mg/Al mixed oxides for the homogeneous alkali alkoxides previously used in the liquid phase Guerbet condensation of methanol and n-propanol. In combination with pre-activated copper chromite, Mg/Al mixed oxides obtained by calcination of the corresponding hydrotalcite precursors appeared to be active catalysts.…”

Section: -186mentioning

confidence: 99%

See 1 more Smart Citation

Review of catalytic systems and thermodynamics for the Guerbet condensation reaction and challenges for biomass valorization

Gabriëls

Hernández

Sels

et al. 2015

Catal. Sci. Technol.

249

233

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The Guerbet condensation reaction is an alcohol coupling reaction that has been known for more than a century. Because of the increasing availability of bio-based alcohol feedstock, this reaction is of growing importance and interest in terms of value chains of renewable chemical and biofuel production. Due to the specific branching pattern of the alcohol products, the Guerbet reaction has many interesting applications. In comparison to their linear isomers, branched-chain Guerbet alcohols have extremely low melting points and excellent fluidity. This review provides thermodynamic insights and unravels the various mechanistic steps involved. A comprehensive overview of the homogeneous, heterogeneous and combined homogeneous and heterogeneous catalytic systems described in published reports and patents is also given. Technological considerations, challenges and perspectives for the Guerbet chemistry are discussed.

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Section: -186mentioning

confidence: 99%

“…It is therefore often applied in the Guerbet reaction with ethanol or n-propanol for the production of isobutanol, a product which can be processed to isobutene and methyl-tert-butyl ether. [79][80][81][82][83][84][85] The latter is often used as a fuel additive to increase octane numbers. 86 Butanol can also serve as a source of C 4 -olefins.…”

mentioning

confidence: 99%

Review of catalytic systems and thermodynamics for the Guerbet condensation reaction and challenges for biomass valorization

Gabriëls

Hernández

Sels

et al. 2015

Catal. Sci. Technol.

249

233

View full text Add to dashboard Cite

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“…The selective synthesis of isobutyl alcohol (iBuOH) has recently gained an increasing interest because this substrate is a potential precursor of gasoline additives such as methyl-tertbutyl-ether or isooctane. iBuOH may be directly synthesized from syngas through the higher-molecular-weight alcohols synthesis carried out at high temperature and pressure over copper chromite catalysts [174].…”

Section: Clean Energy Productionmentioning

confidence: 99%

Applications and Preparation Methods of Copper Chromite Catalysts: A Review

Прасад

2011

Bull. Chem. React. Eng. Catal.

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In this review article various applications and preparation methods of copper chromite catalysts have been discussed. While discussing it is concluded that copper chromite is a versatile catalyst which not only catalyses numerous processes of commercial importance and national program related to defence and space research but also finds applications in the most concerned problem worldwide i.e. environmental pollution control. Several other very useful applications of copper chromite catalysts are in production of clean energy, drugs and agro chemicals, etc. Various preparation methods about 15 have been discussed which depicts clear idea about the dependence of catalytic activity and selectivity on way of preparation of catalyst. In view of the globally increasing interest towards copper chromite catalysis, reexamination on the important applications of such catalysts and their useful preparation methods is thus the need of the time. This review paper encloses 369 references including a well-conceivable tabulation of the newer state of the art.

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“…Carlini and co-workers [27,95] have studied various metals on the same Mg:Al mixed oxide support for the coupling of methanol with propan-1-ol in a batch reactor at 473 to 493 K and 3 MPa. The metals (Pd, Ni, Rh, and Cu) were either supported on the basic mixed metal oxide or supported on carbon and added as a physical mixture [95].…”

Section: Catalysts With Transition Metal Componentsmentioning

confidence: 99%

“…The second feature of a catalyst needed for alcohol coupling is the ability to facilitate dehydrogenation of the alcohol at the reaction temperature. Some typical metals used as dehydrogenating agents include platinum [11], nickel [13,24,25] and copper [26][27][28][29]. Some non-metals, such as the solid base MgO, can catalyze dehydrogenation of alcohols at sufficiently high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Carbon-Carbon Bond Forming Reactions Over Metal Oxide Catalysts

Kozlowski¹

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Alcohol coupling, also known as the Guerbet reaction, is a potentially important process to increase the value of short chain alcohols. Metal oxides, metal phosphates and supported transition metals like copper are some examples of heterogeneous catalysts for the reaction.However, the wide variety of catalyst compositions, reaction conditions, and reactor configurations used to study the reaction complicates a direct comparison of various catalysts.Herein, rates over different catalysts will be compared. One existing gap in the current literature is a thorough comparison of the surface acid and base properties of catalysts employed in the Guerbet coupling of alcohols. In this work, various bifunctional materials were synthesized, characterized, and used in Guerbet alcohol coupling and other probe reactions of acid and base catalysts.One well-studied reaction catalyzed by acids and bases is transesterification. Two series of Mg:Zr mixed oxides, prepared by either co-precipitation or sol-gel synthesis, were characterized and evaluated in the base-catalyzed transesterification of tributyrin with methanol.A co-precipitated Mg-rich mixed oxide catalyst with Mg:Zr 11:1 was approximately 300% more active than MgO on a surface area basis, whereas pure ZrO 2 was inactive for the reaction. To explore the nature of the activity enhancement, samples were characterized by X-ray diffraction, N 2 adsorption, CO 2 adsorption microcalorimetry and DRIFTS of adsorbed CO 2 and CH 3 OH.Although the sol-gel synthesis method provided better atomic-level mixing of Mg and Zr, the resulting catalysts were not as effective as mixed oxides prepared by co-precipitation. The most active mixed oxide (Mg:Zr 11:1) exhibited a high initial heat of CO 2 adsorption and modified modes of methanol adsorption compared to MgO. However, the CO 2 adsorption capacity did not correlate to catalyst activity.

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Guerbet condensation of methanol with n-propanol to isobutyl alcohol over heterogeneous copper chromite/Mg–Al mixed oxides catalysts

Cited by 50 publications

References 27 publications

Review of catalytic systems and thermodynamics for the Guerbet condensation reaction and challenges for biomass valorization

Review of catalytic systems and thermodynamics for the Guerbet condensation reaction and challenges for biomass valorization

Applications and Preparation Methods of Copper Chromite Catalysts: A Review

Carbon-Carbon Bond Forming Reactions Over Metal Oxide Catalysts

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