Room temperature synthesis of glycerol carbonate catalyzed by spray dried sodium aluminate microspheres

Ramesh, Sreerangappa; Debecker, Damien P.

doi:10.1016/j.catcom.2017.04.034

Cited by 41 publications

(39 citation statements)

References 31 publications

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“…In the simple “spray drying” mode, the non‐volatile species which are present in the liquid system are dried or precipitated to the solid state. A successful example of catalyst preparation by spray drying is that of NaAlO 2 microspheres which consisted in the aggregation of relatively small crystallites, exhibiting enhanced surface basicity and outstanding activity in the base‐catalysed synthesis of glycerol carbonate . Spray drying can also be used to disperse active materials onto structured catalyst supports, as demonstrated recently in the case of soot combustion catalysts .…”

Section: Aerosol‐assisted Sol‐gel Processmentioning

confidence: 99%

Innovative Sol‐Gel Routes for the Bottom‐Up Preparation of Heterogeneous Catalysts

Debecker

2017

The Chemical Record

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Heterogeneous catalysts can be prepared by different methods offering various levels of control on the final properties of the solid. In this account, we exemplify bottom-up preparation routes that are based on the sol-gel chemistry and allow to tailor some decisive properties of solid catalysts. First, an emulsion templating strategy is shown to lead to macrocellular self-standing monoliths with a macroscopic 3D structure. The latter can be used as catalyst or catalyst supports in flow chemistry, without requiring any subsequent shaping step. Second, the aerosol-assisted sol-gel process allows for the one-step and continuous production of porous mixed oxides. Tailored textural properties can be obtained together with an excellent control on composition and homogeneity. Third, the application of non-hydrolytic sol-gel routes, in the absence of water, leads to mixed oxides with outstanding textural properties and with peculiar surface chemistry. In all cases, the resulting catalytic performance can be correlated with the specificities of the preparation routes presented. This is exemplified in catalytic reactions in the fields of biomass conversion, petro chemistry, enantioselective organic synthesis, and air pollution mitigation.

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Section: Aerosol‐assisted Sol‐gel Processmentioning

confidence: 99%

Innovative Sol‐Gel Routes for the Bottom‐Up Preparation of Heterogeneous Catalysts

Debecker

2017

The Chemical Record

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“…Only a small number of publications have reported NaAlO 2 as an active catalyst for a limited number of base‐catalyzed reactions (transesterification, isomerization, and condensation) . Recently, we showed that NaAlO 2 is an excellent active phase for the production of glycerol carbonate, especially if produced by spray drying, in the form of aggregates of small crystallites featuring a high density of strong basic sites . The catalyst exhibited record activity in the classical reaction conditions and was also very active at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…In its pure solid form, however, NaAlO 2 is highly hygroscopic and corrosive, making its handling problematic. Also, the commercially available form of NaAlO 2 or the solid obtained by simple drying of NaAlO 2 solution has a very low surface area (below 5 m 2 g −1 ) . Blending, supporting, or dispersing this highly reactive component would be a relevant strategy to optimize both catalytic activity and workability.…”

Section: Introductionmentioning

confidence: 99%

Hydrotalcites Promoted by NaAlO₂ as Strongly Basic Catalysts with Record Activity in Glycerol Carbonate Synthesis

et al. 2018

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A new type of highly basic catalysts is obtained by promoting Mg–Al layered double hydroxides with sodium aluminate. The Mg–Al mixed oxides obtained by the calcination of pristine hydrotalcites are poorly active in the synthesis of glycerol carbonate from glycerol and dimethyl carbonate (DCM). Pure sodium aluminate on the other hand is highly active in this reaction, but it is also highly corrosive, making its handling problematic. Remarkably, promoting hydrotalcites with low amounts of sodium aluminate is sufficient to reach high yields. At 90 °C, with 3 wt % catalyst and with a DMC/glycerol ratio of 2:1, a glycerol conversion of 92 % was achieved after 30 min over the 10 wt % NaAlO2/hydrotalcite catalyst with almost 100 % selectivity towards glycerol carbonate. The texture and the crystallinity of the catalysts were strongly affected by the addition of NaAlO2. The high activity was clearly correlated with the boost in basicity brought about by sodium aluminate promotion. Whereas pristine hydrotalcites possess only weak basic sites, the basicity of the catalysts increased drastically upon promotion with NaAlO2, both in amount and strength. Diffuse reflectance infrared spectroscopy coupled with CO2 adsorption measurements revealed the presence of surface carbonates arising from strongly basic sites. Importantly, our study demonstrates that these basic catalysts are truly heterogeneous, stable, and reusable.

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“…Ramesh et al. synthesized glycerol carbonate at the room temperature through spraying NaAlO 2 granules . Agafonov et al.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Dolomite Promoted by NaAlO₂ and Application as Catalyst in Transesterification by Response Surface Methodology

et al. 2019

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The effective heterogeneous base catalysts are synthesized to intensify the catalytic capacity of dolomite via the wet impregnation method with NaAlO2. Compared with the calcined natural dolomite, the catalyst promoted by 10% NaAlO2 possesses the higher basic density and more developed mesoporous structure, where the better catalytic activity is performed to transesterify palm oil with methanol. Response surface methodology with Box‐Behnken Design (RSM‐BBD) is used to investigate the combined effects of the catalyst loaded amount, molar ratio of methanol to oil, transesterification temperature and duration on biodiesel yield. Results show that the highest yield of 99.27% is achieved with the 5.30 wt.% catalyst loaded amount and 12.39 molar ratio of methanol to oil at 65.26 °C for 2.11 h. The catalyst shows superior stability and efficiency of 89.92% is achieved for the fifth reused cycle, where for the pure calcined dolomite it is 77.58%. Also, the physicochemical indices of the purified transesterification product are in accordance with ASTM D6751 standard.

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Room temperature synthesis of glycerol carbonate catalyzed by spray dried sodium aluminate microspheres

Cited by 41 publications

References 31 publications

Innovative Sol‐Gel Routes for the Bottom‐Up Preparation of Heterogeneous Catalysts

Innovative Sol‐Gel Routes for the Bottom‐Up Preparation of Heterogeneous Catalysts

Hydrotalcites Promoted by NaAlO₂ as Strongly Basic Catalysts with Record Activity in Glycerol Carbonate Synthesis

Characterization of Dolomite Promoted by NaAlO₂ and Application as Catalyst in Transesterification by Response Surface Methodology

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Room temperature synthesis of glycerol carbonate catalyzed by spray dried sodium aluminate microspheres

Cited by 41 publications

References 31 publications

Innovative Sol‐Gel Routes for the Bottom‐Up Preparation of Heterogeneous Catalysts

Innovative Sol‐Gel Routes for the Bottom‐Up Preparation of Heterogeneous Catalysts

Hydrotalcites Promoted by NaAlO2 as Strongly Basic Catalysts with Record Activity in Glycerol Carbonate Synthesis

Characterization of Dolomite Promoted by NaAlO2 and Application as Catalyst in Transesterification by Response Surface Methodology

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Product

Resources

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Hydrotalcites Promoted by NaAlO₂ as Strongly Basic Catalysts with Record Activity in Glycerol Carbonate Synthesis

Characterization of Dolomite Promoted by NaAlO₂ and Application as Catalyst in Transesterification by Response Surface Methodology