Comparative study of physico-chemical properties of laboratory and industrially prepared layered double hydroxides and their behavior in aldol condensation of furfural and acetone

Hora, Lukáš; Kikhtyanin, Oleg; Čapek, Libor; Bortnovskiy, Oleg; Kubička, David

doi:10.1016/j.cattod.2014.03.010

Cited by 58 publications

(42 citation statements)

References 31 publications

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“…This research group was also able to show that the aldolization reaction can be performed by using an industrial prepared Mg-Al HT-derived catalyst. 125 Despite the morphology and textural properties of the catalysts being different depending on the preparation method (a lower surface area was observed in the industrially prepared catalysts, which also affected the efficiency of the catalytic reaction), the basic properties of the samples were not influenced by this parameter. Still, the best catalytic performance was observed for the catalysts prepared with an Mg/Al molar ratio equal to 3.…”

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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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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“…Table 5 evidences that such in situ rehydration method could be really effective, since the pretreatment of calcined Mg-Al mixed oxide with aqueous acetone mixture containing 10% of water resulted in a dramatic increase in the activity of rehydrated Mg-Al hydrotalcites in aldol condensation. The observed improvement in the catalytic activity is caused by the transformation of Lewis basic sites which are present in calcined Mg-Al material to Brønsted basic sites which possess higher activity in different organic reactions in comparison with Lewis basic sites [19,23].…”

Section: The Properties Of Thermally Treated Tio 2 and Mg-al Htc Samplesmentioning

confidence: 99%

“…were used for synthesis of TiO 2 . Mg-Al hydrotalcites (HTC) with Mg to Al molar ratio of 3 was prepared according to [23]. BEA zeolite (Si/Al = 12.5) was received from Zeolyst Int.…”

Section: Methodsmentioning

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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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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“…DTG curves of analyzed samples show several decomposition steps that are accompanied by mass loss. Physically adsorbed and interlayer water is eliminated at 50-200 ∘ C, layer OH-groups and decomposition of the interlayer carbonates is observed at 200-500 ∘ C. 20 Laboratory prepared sample LAB 4:1 shows high loss of weight at 65 ∘ C; this is due to imperfect drying of filter cake after LDH synthesis. Laboratory samples released water at temperatures below 200 ∘ C, while industrial samples released the water at higher temperature, i.e.…”

Section: Characterization Of Materialsmentioning

confidence: 99%

Aldol condensation of benzaldehyde and heptanal: a comparative study of laboratory and industrially prepared Mg–Al mixed oxides

Vrbková

Tišler

Vyskočilová

et al. 2017

J of Chemical Tech & Biotech

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Comparative study of physico-chemical properties of laboratory and industrially prepared layered double hydroxides and their behavior in aldol condensation of furfural and acetone

Cited by 58 publications

References 31 publications

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

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

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

Aldol condensation of benzaldehyde and heptanal: a comparative study of laboratory and industrially prepared Mg–Al mixed oxides

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