Toward understanding of the role of Lewis acidity in aldol condensation of acetone and furfural using MOF and zeolite catalysts

Kikhtyanin, Oleg; Kubička, David; Čejka, Jiřı́

doi:10.1016/j.cattod.2014.08.016

Cited by 96 publications

(71 citation statements)

References 37 publications

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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%

“…FAc-OH, as the initial product of aldol condensation, was easily dehydrated in the presence of strong acid centers of H-BEA to form FAc with selectivity exceeding 80%. According to [14,19], the presence (FAc) 2 , which is formed by the dimerization of FAc, is a distinctive feature of aldol condensation of furfural with acetone in the presence of acidic catalysts. Characterization of the TiO 2 materials by the TPD method using NH 3 and CO 2 indicated that these solids exhibited amphoteric character, i.e.…”

Section: Tablementioning

confidence: 99%

“…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]. Recently, zeolites have been reported as catalysts for aldol condensation of furfural with acetone [19]. It was shown that by using zeolites the disadvantages of basic catalysts i.e.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, their activity in aldol condensation of furfural with acetone is lower than that of hydrotalcites. Moreover, they are rapidly deactivated due to coke formation during the reaction [19]. Therefore, along with the optimization of the properties of the solid basic catalysts, attention is currently being focused on alternative solid catalysts for aldol condensation of furfural with acetone.…”

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

confidence: 99%

Section: Tablementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…[11] and metalorganic frameworks (MOFs) were also used to catalyze the condensation reaction between furfural and acetone [12]. The conversion of furfural and the selectivity of furfural to acetone were 38.5% and 79.5%, respectively, at 100˚C using an HBEA zeolite as catalyst.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Aldol Condensation of Furfural with Acetone Catalyzed by 1,8-Diazabicyclo[5.4.0]undec-7-ene

Jiang¹,

Cheng²,

Cheng³

2018

MSCE

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The kinetics of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-catalyzed aldol condensation of furfural with acetone was investigated under free solvent conditions from 50˚C -90˚C. The highest yield of 1,4-pentandien-3-on-1,5-di-furanyl catalyzed by DBU reached 98.0% under optimized conditions. According to the kinetic analysis, the reaction order of furfural was estimated as 1.0, the apparent activation energy was 17.7 kJ•mol −1, and the pre-exponential factor was 2.67 L•min −1 in fitting with the Arrhenius equation, which explains the high efficiency of the DBU catalyst. DBU-catalyzed aldol condensation with free solvent offers an alternative route to simplify aldol condensation and separation into a single step.

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Chemistry ofCCBond Formation Reactions Used in Biomass Upgrading: Reaction Mechanisms, Site Requirements, and Catalytic Materials

Bui

Duong

Anaya

et al. 2019

Chemical Catalysts for Biomass Upgrading

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Toward understanding of the role of Lewis acidity in aldol condensation of acetone and furfural using MOF and zeolite catalysts

Cited by 96 publications

References 37 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

Kinetics of Aldol Condensation of Furfural with Acetone Catalyzed by 1,8-Diazabicyclo[5.4.0]undec-7-ene

Chemistry ofCCBond Formation Reactions Used in Biomass Upgrading: Reaction Mechanisms, Site Requirements, and Catalytic Materials

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