Highly Catalytic Activity of Ba/γ-Ti–Al2O3 Catalyst for Aldol Condensation of Methyl Acetate with Formaldehyde

Bao, Qi; Qi, Hui; Zhang, Chunlei; Ning, Chunli; Zhang, Yi; Jiang, Ye; Wu, Yifan; Gui, Wenying; Wang, Zhenlü

doi:10.1007/s10562-018-2535-9

Cited by 16 publications

(9 citation statements)

References 42 publications

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“…Aldol condensation is a well-known C-C bond formation process which can occur in acidic or basic sites, the latter being more frequently reported in the literature [6][7][8][9][10][11][12][13][14][15]. It requires the existence of a reactive hydrogen in alpha position, with respect to a carbonyl compound able to form an enol, which reacts with another carbonyl compound, and after dehydration, yields a conjugated enone.…”

Section: Introductionmentioning

confidence: 99%

Aldol Condensation of Furfural with Acetone Over Mg/Al Mixed Oxides. Influence of Water and Synthesis Method

et al. 2019

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Aldol condensation of furfural and acetone (an important initial step to obtain diesel from biomass) was studied over MgAl mixed oxides. The influence of the utilization of microwaves and/or a surfactant (Pluronic 123) during the synthesis as well as the use of water (either pre-hydrating the solids before catalytic studies or in water/toluene mixtures as the reaction medium) is discussed. The combined use of Pluronic 123 and microwaves led to solids with bigger pore sizes, exhibiting lower basicity and higher acidity than the conventional synthetic method, thus resulting in an increase in the yield of the desired product of condensation, comprising two molecules of furfural and one of acetone (F2Ac). As for the influence of water, re-hydration of the mixed oxides was detrimental to activity, probably as a result of the partial blocking (solvation) of active sites. On the contrary, the increase in water percentage in the reaction medium resulted in higher conversions, though selectivity to F2Ac decreased. The weakening of the C=O bond of furfural in the presence of water as well as the higher solubility of the first condensation product (FAc) in toluene, as compared to water, could account for that. A 44.5% yield of F2Ac (66% conversion) after 16 h was obtained with the most active solid, which maintained the activity for three consecutive reactions.

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Section: Introductionmentioning

confidence: 99%

Aldol Condensation of Furfural with Acetone Over Mg/Al Mixed Oxides. Influence of Water and Synthesis Method

et al. 2019

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“…46 The bands around 1548 and 1638 cm −1 (Figure 6a) were assigned to the adsorbed B acid sites. 29,47 48 This result indicated that the part of Al was combined with the support silicon. L acid sites were observed at 1455 and 1623 cm −1 .…”

Section: Resultsmentioning

confidence: 84%

“…The peak at 1488 or 1493 cm –1 was assigned to both the Brφnsted (B) acid sites and Lewis (L) acid sites . The bands around 1548 and 1638 cm –1 (Figure a) were assigned to the adsorbed B acid sites. , Leyva et al reported that the source of B acid sites of the SiO 2 –Al 2 O 3 catalyst was from the formation of Si–O–Al linkages . This result indicated that the part of Al was combined with the support silicon.…”

Section: Results and Discussionmentioning

confidence: 95%

“…However, the intensity of SiO 2 peaks decreased after the Al and Cs loading, indicating a certain degree of active species incorporation inside the structure of silica . This phenomenon also implied that active species were well-dispersed on the catalyst …”

Section: Results and Discussionmentioning

confidence: 97%

“…28 This phenomenon also implied that active species were well-dispersed on the catalyst. 29 3.2. FT-IR Analysis.…”

Section: Resultsmentioning

confidence: 99%

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Cesium Loaded on an Al-Modified Silica Support Catalyst for Methyl Acrylate Synthesis by Aldol Condensation of Methyl Acetate and Formaldehyde

Yan

Deng

Ran

et al. 2022

Ind. Eng. Chem. Res.

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An Al-modified silica-supported cesium catalyst was prepared by an incipient wetness impregnation method for the gas-phase aldol condensation reaction of methyl acetate and formaldehyde. The effect of the Al-modified silica support on the structure, specific surface area, and the acid property was studied using X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption–desorption, NH3-temperature programmed desorption, X-ray photoelectron spectroscopy, and Py-IR. Adding the cesium species, the Cs–Al/SiO2 catalyst performed well based on the evaluation results in a fixed-bed reactor. A combination of these characterization and testing results manifests the influence of acid–base properties on the catalytic activity. It was found that the selectivity was related to the amount of weak acid sites and medium-strong base sites. The highest selectivity of methyl acrylate (MA) was obtained at T = 355 °C, LHSV = 0.6 h–1, and Ma/FA/MeOH molar ratio = 1:1:2 over the 10% Cs–3% Al/SiO2 catalyst. Finally, the performance of the optimized catalyst did not exhibit an obvious decrease via three times in situ regeneration.

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Higher Acetone Conversion Obtained Over a TiO2–Pd Bifunctional Catalyst for Liquid-Phase Synthesis of Methyl Isobutyl Ketone: The Role of Al2O3 Support

et al. 2019

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Highly Catalytic Activity of Ba/γ-Ti–Al2O3 Catalyst for Aldol Condensation of Methyl Acetate with Formaldehyde

Cited by 16 publications

References 42 publications

Aldol Condensation of Furfural with Acetone Over Mg/Al Mixed Oxides. Influence of Water and Synthesis Method

Aldol Condensation of Furfural with Acetone Over Mg/Al Mixed Oxides. Influence of Water and Synthesis Method

Cesium Loaded on an Al-Modified Silica Support Catalyst for Methyl Acrylate Synthesis by Aldol Condensation of Methyl Acetate and Formaldehyde

Higher Acetone Conversion Obtained Over a TiO2–Pd Bifunctional Catalyst for Liquid-Phase Synthesis of Methyl Isobutyl Ketone: The Role of Al2O3 Support

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