Room temperature synthesis of solketal from acetalization of glycerol with acetone: Effect of crystallite size and the role of acidity of beta zeolite

Manjunathan, Pandian; Maradur, Sanjeev P.; Halgeri, A. B.; Shanbhag, Ganapati V.

doi:10.1016/j.molcata.2014.09.028

Cited by 150 publications

(93 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is a process of transesterification of triglycerides with methanol in the presence of acidic or basic catalysts. Biodiesel has been considered to be one of the most promising alternatives to fossil fuel resources [1][2][3][4]. In addition, the process produces substantial amounts of glycerol as the main by-product, which is equivalent to 10 wt% of the total biodiesel production [5].…”

Section: Introductionmentioning

confidence: 99%

“…Among the value addition processes of glycerol, the acetalization of glycerol with an aldehyde or a ketone is an important transformation to produce oxygenated compounds such as acetals and solketal [9]. In general, the acetalization of glycerol with acetone gives branched oxygenated compounds, namely (2,2-dimethyl- [1,3] dioxane-4-yl)-methanol (solketal) and 2,2-dimethyl- [1,3] dioxane-5-ol. Solketal is an excellent component for the formulation of gasoline, as ignition accelerator and antiknock additives in combustion engines, biodiesel fuels and also has great industrial applications in cosmetics, fragrances and pharmaceuticals [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acetalization of glycerol with acetone over various metal-modified SBA-15 catalysts

2018

View full text Add to dashboard Cite

Several catalysts containing metals such as Al, Zr, Ti and Nb were incorporated in SBA-15 with Si/M ratio = 20 using the hydrothermal process. These catalysts were evaluated for their reactivity during acid-catalyzed condensation of glycerol with acetone to yield a mixture of branched compounds, namely (2,2-dimethyl-[1,3] dioxane-4-yl)-methanol (solketal) and 2,2-dimethyl-[1,3] dioxane-5-ol, which are being used as fuel additives. The synthesised catalyst samples were characterized by ICP-AES analysis, N 2 adsorption-desorption measurements, X-ray diffraction, FT-IR, SEM-EDX, UV-visible diffuse reflectance spectroscopy, TPD of ammonia and ex situ pyridine-adsorbed FT-IR spectroscopy. The various characterization results confirm that metal oxides were incorporated in the pore wall of the SBA-15 matrices. The results of NH 3 -TPD and ex situ adsorbed pyridine FT-IR analyses showed that the acidity of the samples increased after incorporation of metal into the pure SBA-15 samples. Among various metals incorporated into the SBA-15, the Nb-SBA-15 (Si/Nb = 20) showed higher catalytic activity toward the acetalization of glycerol in liquid phase compared to that of other samples investigated. Under the optimal reaction conditions, the Nb-SBA-15 (Si/Nb = 20) exhibited 95% glycerol conversion with 100% solketal selectivity. The catalyst reusability studies indicated that the Nb-SBA-15 sample is regenerable and highly stable in the acetalization of glycerol.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acetalization of glycerol with acetone over various metal-modified SBA-15 catalysts

2018

View full text Add to dashboard Cite

show abstract

“…Many efforts have thus been made to develop chemical process technologies to convert glycerol into value‐added products, through oxidation, dehydrogenation, etherification, acetalization, and condensation …”

Section: Introductionmentioning

confidence: 99%

Relationship between Acid–Base Properties and the Activity of ZrO₂‐Based Catalysts for the Cannizzaro Reaction of Pyruvaldehyde to Lactic Acid

et al. 2017

View full text Add to dashboard Cite

The Cannizzaro reaction of pyruvaldehyde to lactic acid is investigated in a flow reactor with ZrO2 catalysts with different structures and acid–base properties. The results show that a difference in the crystalline structures of two ZrO2 polymorphs strongly affects the conversion of pyruvaldehyde. The monoclinic phase of zirconia is the most active for this reaction. A good correlation is observed between the reaction rate and the concentration of Lewis acid sites of sufficient strength, which shows that these sites play a major role in the reaction. A reaction mechanism is proposed involving coordinatively unsaturated Zr4+ cations as sites for activating pyruvaldehyde molecules, whereas Zr4+−O2− pairs generate terminal OH groups through water dissociation.

show abstract

“…So far, only H-Beta, thanks to its pore structure and hydrophobicity, has been suggested in the literature [11,15,16] as a promising catalyst for the abovementioned process.…”

Section: Introductionmentioning

confidence: 99%

“…However, according to literature data [21][22][23], the yield of nanocrystalline zeolites in the synthesis procedure is less than 10 % in relation to the initial gel composition, while the yield of micron-particle products reaches 100 %. Due to the [16], different attempts are being made to prepare materials that possess the nanoparticles. It has been shown that small particles may be obtained from commercial zeolites by means of a grinding procedure [23,24].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the catalytic activity of H-ZSM-5 zeolites for glycerol acetalization by mechanical grinding

Kowalska-Kuś

Held

Nowiǹska

2015

Reac Kinet Mech Cat

View full text Add to dashboard Cite

The synthesis of 2,2-dimethyl-1,3-dioxolane-4-methanol (solketal) from acetalization of glycerol with acetone was carried out over two types of ZSM-5 zeolites of similar Si/Al ratio (=12.5 and 13.5) characterized with different particle sizes. The reaction was performed in a liquid phase, under mild reaction conditions. The applied samples showed very different glycerol conversion depending on the particle size of the catalysts. Using large particle materials results in relatively low activity in the studied reaction due to the long diffusion way of substrates and products. The modification of commercial zeolites by means of grinding results in the formation of fine agglomerates and brings about a significant increase in solketal yield.

show abstract

Room temperature synthesis of solketal from acetalization of glycerol with acetone: Effect of crystallite size and the role of acidity of beta zeolite

Cited by 150 publications

References 25 publications

Acetalization of glycerol with acetone over various metal-modified SBA-15 catalysts

Acetalization of glycerol with acetone over various metal-modified SBA-15 catalysts

Relationship between Acid–Base Properties and the Activity of ZrO₂‐Based Catalysts for the Cannizzaro Reaction of Pyruvaldehyde to Lactic Acid

Enhancement of the catalytic activity of H-ZSM-5 zeolites for glycerol acetalization by mechanical grinding

Contact Info

Product

Resources

About

Room temperature synthesis of solketal from acetalization of glycerol with acetone: Effect of crystallite size and the role of acidity of beta zeolite

Cited by 150 publications

References 25 publications

Acetalization of glycerol with acetone over various metal-modified SBA-15 catalysts

Acetalization of glycerol with acetone over various metal-modified SBA-15 catalysts

Relationship between Acid–Base Properties and the Activity of ZrO2‐Based Catalysts for the Cannizzaro Reaction of Pyruvaldehyde to Lactic Acid

Enhancement of the catalytic activity of H-ZSM-5 zeolites for glycerol acetalization by mechanical grinding

Contact Info

Product

Resources

About

Relationship between Acid–Base Properties and the Activity of ZrO₂‐Based Catalysts for the Cannizzaro Reaction of Pyruvaldehyde to Lactic Acid