Aldol condensation of furfural and acetone over MgAl layered double hydroxides and mixed oxides

Hora, Lukáš; Kelbichová, Vendula; Kikhtyanin, Oleg; Bortnovskiy, Oleg; Kubička, David

doi:10.1016/j.cattod.2013.09.022

Cited by 153 publications

(91 citation statements)

References 24 publications

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“…The calcination of this material at 450 • C resulted in a significant increase in its activity in the reaction so that furfural conversion reached 24%. According to previous studies, such increase in activity in base-catalyzed reactions observed for calcined Mg-Al materials is due to the decomposition of carbonate groups during the heat treatment of the as-prepared samples and formation of strong basic sites [15]. The presence of strong basicity in calcined Mg-Al mixed oxides was confirmed by CO 2 -TPD (see above).…”

Section: Tablementioning

confidence: 62%

“…In addition, solid catalysts with acid-base character are recognized as a promising alternative to homogeneous catalysts for aldol condensation of furfural with acetone. Among solid catalysts, double layered hydroxides (hydrotalcites) with basic character are considered as the most promising catalysts for this reaction [8,[11][12][13][14][15]. The essential disadvantages of such basic catalysts are their high sensitivity to ambient CO 2 , which transforms them into catalytically inactive carbonates, and the lack of reliable methods for recovering their catalytic properties after regeneration [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Nanosized TiO2—A promising catalyst for the aldol condensation of furfural with acetone in biomass upgrading

et al. 2016

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a b s t r a c t Nanosized TiO 2 catalyst was successfully prepared by a simple green procedure and used in liquid phase aldol condensation of furfural with acetone, a key step in bio-fuel processing. In order to determine the effect of calcination temperature on catalytic properties of TiO 2 , the as-prepared TiO 2 and calcined TiO 2 (150-900• C) were studied by XRD, BET, TPD-CO 2 /NH 3 , TGA/DTG and FTIR evaluation. The catalytic performance of TiO 2 samples in aldol condensation of furfural with acetone was evaluated and compared with that of Mg-Al hydrotalcites and a BEA zeolite. These experiments showed that uncalcined TiO 2 possessed reasonable activity in aldol condensation of furfural to acetone and resulted in commonly produced condensation products. The observed catalytic behavior of TiO 2 could be competitive with that reported for other inorganic solids. The calcination of TiO 2 resulted, however, in a decrease in its catalytic activity due to extensive dehydration and surface dehydroxylation as well as due to changes of textural properties resulting in a decrease in the amount of accessible active sites. Thanks to its advanced properties, nanosized TiO 2 is a promising catalyst for aldol condensation of furfural with acetone and could broaden possibilities for optimizing conditions for bio-fuel production.

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Section: Tablementioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Nanosized TiO2—A promising catalyst for the aldol condensation of furfural with acetone in biomass upgrading

et al. 2016

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“…More recently, Hora et al 124 presented an extensive study of the influence of different preparation parameters of HT-based catalysts on their activity and selectivity in the aldol condensation of furfural with acetone. Three different activation procedures of the LDH structure were applied in order to obtain the desired catalyst: (i) calcination at 450°C; (ii) ex situ rehydration of the calcined material (carried out in liquid or gas phase), and (ii) in situ rehydration of the calcined material (carried out in liquid phase).…”

Section: Aldol Condensationmentioning

confidence: 99%

Recent advances on the utilization of layered double hydroxides (LDHs) and related heterogeneous catalysts in a lignocellulosic-feedstock biorefinery scheme

et al. 2017

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Layered double hydroxides (LDHs) and derived materials have been widely used as heterogeneous catalysts for different types of reactions either in gas or in liquid phase. Among these processes, the valorization/upgrading of lignocellulosic biomass and derived molecules have attracted enormous attention because it constitutes a pivotal axis in the transition from an economic model based on fossil resources to one based on renewable biomass resources with preference for biomass waste streams. Proof of this is the increasing amount of literature reports regarding the rational design and implementation of LDHs and related materials in catalytic processes such as: depolymerization, hydrogenation, selective oxidations, and C-C coupling reactions, among others, where biomass-derived compounds are used. The major aim of this contribution is to situate the most recent advances on the implementation of these types of catalysts into a lignocellulosic-feedstock biorefinery scheme, highlighting the versatility of LDHs and derived materials as multifunctional, tunable, cheap and easy to produce heterogeneous catalysts.

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“…The efficiency of LDHs and mixed oxides obtained by the calcination of LDHs as aldolization catalysts has been demonstrated primarily in the reaction of furfural with acetone [31,32,[45][46][47][48]. As a rule, MgAl-and MgZr-(hydr) oxides are employed, whereas the data regarding with LDHs of other chemical composition, particularly, LDHs containing alkali metal cations and capable of providing a most basicity, are very scarce.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemically synthesized LiAlOx catalyst for aqueous aldol condensation of furfural with acetone

Степанова¹,

Mironenko²,

Belskaya³

et al. 2017

Catalysis for Sustainable Energy

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Abstract:In the present study, the mechanochemical method is proposed for synthesis of LiAl-layered double hydroxides (LDHs). This method is eco-friendly and allows obtaining LiAl-LDH under relatively mild conditions (centripetal acceleration of milling bodies 300 m s -2 ) and in a short period of time (15 minutes). The structures of as-prepared LiAl-LDH, LiAl-mixed oxide (calcined LDH) and "activated" LiAl-LDH obtained after rehydration of the corresponding mixed oxide were confirmed by X-ray diffraction. The basicity of LiAlO x was measured by temperature-programmed desorption of CO 2 and double isotherm technique. According to data obtained, LiAl-mixed oxide has a significant higher carbon dioxide adsorption capacity compared to MgAlmixed oxides prepared by conventional co-precipitation method. This indicates a large amount of basic surface sites with different strength (strong, medium and weak) for Li-containing systems. The formation of "activated" LiAl-LDH having Brønsted basic sites (OH groups in the interlayer space) provides an increased catalytic activity of LiAlO x in the reaction of aqueous-phase aldol condensation between furfural and acetone.

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Aldol condensation of furfural and acetone over MgAl layered double hydroxides and mixed oxides

Cited by 153 publications

References 24 publications

Nanosized TiO2—A promising catalyst for the aldol condensation of furfural with acetone in biomass upgrading

Nanosized TiO2—A promising catalyst for the aldol condensation of furfural with acetone in biomass upgrading

Recent advances on the utilization of layered double hydroxides (LDHs) and related heterogeneous catalysts in a lignocellulosic-feedstock biorefinery scheme

Mechanochemically synthesized LiAlOx catalyst for aqueous aldol condensation of furfural with acetone

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