Gas-phase dehydration of glycerol over calcined tungsten-modified Zn–Al–O hydrotalcite-type catalysts

Иванова, А. С.; Корнеева, Е. В.; Бондарева, В. М.; Glazneva, Tatiana S.

doi:10.1016/j.molcata.2015.07.009

Cited by 10 publications

(7 citation statements)

References 32 publications

(38 reference statements)

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“…Polyoxotungstates are a challenging and attractive part of the polyoxometalate possessing a variety of structures and topologies that can be used not only in catalysis, but also in photochemistry [104,110,[115][116][117] and electrochemistry [105,112].…”

Section: Layered Double Hydroxides Intercalated With High-nuclearity mentioning

confidence: 99%

Highlights on the Catalytic Properties of Polyoxometalate-Intercalated Layered Double Hydroxides: A Review

et al. 2020

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Layered double hydroxides (LDH) are an extended class of two-dimensional anionic materials that are known for their unique lamellar structure, versatile composition, and tunable properties. The layered architecture allows the intercalation between the positively charged sheets of a vast variety of anionic species, including oxometalates and polyoxometalates (POM). The hybrid composites that were developed using POM and LDH show great advantages when compared to both parent materials causing the appearance of new functionalities, which may lead to remarkable contributions in many areas of application, especially in catalysis. The current review paper emphases all of the crucial works already existing in literature that are related to the large group of POM-LDH solids and their use as catalysts for fine organic synthesis. The new trends in the development of the POM-LDH catalysts are highlighted based on the overview of 121 scientific articles that were published between 1984 and 2019. The main topics are focused primarily on the synthesis, characterization, and the catalytic applications of different LDH systems hosting polyoxometalates with low, medium, and high nuclearity. The intense exploration of the POM-LDH field has led to the obtaining of countless effective catalysts used in various types of reactions, from condensation, esterification, halodecarboxylation, to oxidation and epoxidation.

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Section: Layered Double Hydroxides Intercalated With High-nuclearity mentioning

confidence: 99%

Highlights on the Catalytic Properties of Polyoxometalate-Intercalated Layered Double Hydroxides: A Review

et al. 2020

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“…11 Such characteristics of glycerol enable it to undergo many reactions, 13 for example, oxidation, 14,15 hydrogenolysis, 16,17 etherification, 18,19 reforming, 20 and dehydration. 21,22 Among those reactions, catalytic glycerol dehydration has attracted considerable attention as the reaction can produce ethers, 23 acetals, 24 ethylene glycol, 25 and acrolein. 26 Acrolein, in particular, can be converted to many value-added chemicals and polymers (Figure 1a).…”

Section: Introductionmentioning

confidence: 99%

“…Physically, glycerol is a clear, colorless, odorless, hygroscopic, viscous, and sweet tasting liquid; , chemically, a glycerol molecule, with two primary and one secondary hydroxyl groups, is very reactive . Such characteristics of glycerol enable it to undergo many reactions, for example, oxidation, , hydrogenolysis, , etherification, , reforming, and dehydration. , Among those reactions, catalytic glycerol dehydration has attracted considerable attention as the reaction can produce ethers, acetals, ethylene glycol, and acrolein . Acrolein, in particular, can be converted to many value-added chemicals and polymers (Figure a).…”

Section: Introductionmentioning

confidence: 99%

Coking of Catalysts in Catalytic Glycerol Dehydration to Acrolein

Jiang

Zhou

Tesser

et al. 2018

Ind. Eng. Chem. Res.

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Catalytic glycerol dehydration provides a sustainable route to produce acrolein because glycerol is a bioavailable platform chemical. However, in this process catalysts are rapidly deactivated due to coking. This paper examines and discusses recent insights into coking of catalysts during catalytic glycerol dehydration. The nature and location of coke and the rate of coking depend on feedstock, operating conditions, and the acidity and pore structure of the solid catalysts. Several methods have been suggested for inhibiting the coking and slowing the deactivation of catalyst, including (1) cofeeding of oxygen, (2) tuning of the pore size of the solid acid catalysts, (3) doping noble metals (Ru, Pt, Pd) into the solid acid catalysts, and (4) designing new reactors. The present methods for inhibiting coking are still unsatisfactory. The deactivated catalysts can be regenerated by removing coke. Nevertheless, the rapid deactivation of the regenerated catalyst remains problematic. The literature survey indicates that the exact chemical compositions of the coke on the catalyst during glycerol dehydration remain elusive. The thermodynamics, kinetics, and mechanism of coking need to be probed so as to advance the development of a catalyst with high activity, selectivity, and resistance to coking to put the catalytic glycerol dehydration into practice.

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“…Freshly-prepared LDH materials showed the structure corresponding to the natural mineral hydrotalcite (JCPDS: 22-0700 [34,35,36], Figure 2a). After thermal treatment (Figure 2b), the diffraction patterns showed characteristic reflections that corresponded to the periclase phase (JCPDS: 00-042-1022), and for samples containing Zn, zincite phase was also observed (ZnO) (JCPDS: 00-036-1451) [37,38,39]. Figure 3 presents the obtained diffractograms for the materials after anion exchange with acrylic or oleic acids.…”

Section: Resultsmentioning

confidence: 99%

“…However, the diffractograms (Figure 3) present the characteristic peaks of the hydrotalcite phase. In the case of samples with Zn, an additional peak, corresponding ZnO phase is observed, except for the sample Mg2ZnAl-AAC, where a pure hydrotalcite like material is obtained and its crystalline degree is higher when compared to the rest of materials [37,38,40].…”

Section: Resultsmentioning

confidence: 99%

Thermal Stability Evaluation of Polystyrene-Mg/Zn/Al LDH Nanocomposites

et al. 2019

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A series of samples of Mg/Zn/Al LDHs (layered double hydroxides) materials was prepared by the co-precipitation and urea hydrolysis methods. They were modified with organic surfactants (acrylate and oleate anions) and characterized by X-ray diffraction, which corroborated the intercalation of anionic species into the interlayer space. The hydrophobized materials were incorporated at low contents (10 and 15 wt.%) to polystyrene, which was synthesized by emulsion polymerization techniques. The polymeric composites were analyzed by thermogravimetry to determine the decomposition temperature. The results demonstrated that the materials with Zn presented the greatest increment in the degradation temperature (7 °C < T < 54 °C). Moreover, the Friedman, Flynn–Wall–Ozawa, and Coats–Redfern models were compared to obtain the kinetic parameters of degradation process. The obtained order of decomposition of the Coats–Redfern model showed that the decomposition process occurs in at least two stages. Finally, the addition of environmentally friendly modified Layered Double Hydroxides (LDH) nanomaterials to the polystyrene (PS) matrix allowed for obtaining polymeric composites with higher thermal stability, retarding the decomposition process of PS.

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Gas-phase dehydration of glycerol over calcined tungsten-modified Zn–Al–O hydrotalcite-type catalysts

Cited by 10 publications

References 32 publications

Highlights on the Catalytic Properties of Polyoxometalate-Intercalated Layered Double Hydroxides: A Review

Highlights on the Catalytic Properties of Polyoxometalate-Intercalated Layered Double Hydroxides: A Review

Coking of Catalysts in Catalytic Glycerol Dehydration to Acrolein

Thermal Stability Evaluation of Polystyrene-Mg/Zn/Al LDH Nanocomposites

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