Dehydration of glycerol to acrolein over Wells–Dawson and Keggin type phosphotungstic acids supported on MCM-41 catalysts

Ma, Tianlin; Ding, Jianfei; Shao, Rong; Xu, Wei; Liu, Yang

doi:10.1016/j.cej.2017.02.018

Cited by 90 publications

(69 citation statements)

References 62 publications

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“…According to the results of pyridine‐FTIR, the Cat‐2 exhibits more Brønsted, fewer Lewis acid sites, and a higher B/(L + B) ratio than Cat‐1. Therefore, we speculate that the Brønsted acid site is beneficial to produce acrolein, and that the Lewis acid site facilitates the formation of hydroxyacetone and acetaldehyde …”

Section: Resultsmentioning

confidence: 98%

“…According to the results of the NH 3 ‐TPD and the FTIR spectra of pyridine adsorption, the total acidity and amount of Brønsted acid sites increased and the intensity of acidity became weak with the modification by an appropriate amount of DTMS. The weaker acidic intensity and the Brønsted acid site are beneficial to the acrolein formation, therefore, the glycerol conversion, the acrolein selectivity, and the yield increase. However, the NaHSO 4 phase may be covered by the excess DTMS loadings, which results in the decrease of the total acidity, specific surface area, pore volume, and pore size of the catalyst, and the hydrophobicity of catalyst is enhanced.…”

Section: Resultsmentioning

confidence: 99%

“…The operation method of the performance evaluation experiment of the catalysts was conducted according to our previous work . The gas dehydration of glycerol was evaluated at 0.1 MPa in a vertical fixed‐bed reactor (50 cm length, 8 mm i.d.)…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, research regarding the effective use of glycerin has become increasingly popular. A significant amount of research related to this topic has been reported, such as dehydration to acrolein, reforming to hydrogen, hydrogenation to 1,2‐propanediol, oxidation to glyceric acid, esterification to monoacylglycerol, etc. Acrolein is a versatile chemical product.…”

Section: Introductionmentioning

confidence: 99%

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Gas phase dehydration of glycerol to acrolein over NaHSO₄@Zr‐MCM‐41 catalyst

Ding

Yan²,

Ma³

et al. 2018

Can J Chem Eng

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The NaHSO 4 @Zr-MCM-41 catalyst modified by dodecyltrimethoxysilane (DTMS) showed excellent performance during the dehydration of glycerol to acrolein. The glycerol conversion and acrolein selectivity and yield on NaHSO 4 -DTMS@Zr-MCM-41 (Cat-2) are higher than that of NaHSO 4 @Zr-MCM-41 (Cat-1). The dispersity of NaHSO 4 is remarkably improved by an appropriate amount of DTMS modification on Cat-2 because of the steric effect between DTMS and NaHSO 4 . Therefore, the total acidic amount of Cat-2 is more than that of Cat-1, but its acidic intensity is weaker than that of Cat-1. The more total amount of acidity is beneficial to improve the glycerol conversion, and weaker acid strength leads to less carbon deposition. The amount of Brønsted acid sites is more than that of Cat-1; however, the amount of Lewis acid sites is less, so the B/(B þ L) of Cat-2 is higher, which is beneficial and improves the acrolein selectivity. The Cat-2 catalyst has proper hydrophobicity by grafting the silane group on the support surface, which can suppress the leaching of NaHSO 4 because the water that existed in the glycerol aqueous solution and that was produced in the reaction is not easily adsorbed on the catalyst surface. The appropriate hydrophobicity is beneficial to the quick desorption of products, which can also suppress the coke formation. The stability of Cat-2 is obviously higher than that of Cat-1 because the coke that was deposited and the S elemental leaching on Cat-1 are more serious than that of Cat-2. The reaction pathway of the dehydration of glycerol was proposed, and the reaction conditions were optimized on the Cat-2 catalyst.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Gas phase dehydration of glycerol to acrolein over NaHSO₄@Zr‐MCM‐41 catalyst

Ding

Yan²,

Ma³

et al. 2018

Can J Chem Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…In general, HPAs have been introduced inside the pore structure of MCM-41 by common impregnation techniques involving passive diffusion of poly-oxometalate anions into the pores of mesoporous silica [72][73][74]. Unfortunately, the HPA/MCM-41 impregnated system commonly lacks of stability in polar medium because of species are not anchored strongly onto the surface.…”

Section: Mcm-41 As Support For Immobilization Heteropolyacidsmentioning

confidence: 99%

Functionalized Ordered Mesoporous Silicas (MCM-41): Synthesis and Applications in Catalysis

et al. 2018

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Mesoporous silica sieves are among the most studied nano-objects due to their stable pore structure and easy preparation. In particular, MCM-41 have attracted increasing research attention due to their chemical versatility. This review focuses on the synthesis and regioselective functionalization of MCM-41 to prepare catalytic systems. The topics covered are: mono and di-functionalized MCM-41 as basic and acid catalysts, catalysts based on metallic complexes and heteropolyacids supported onto MCM-41, metallic nanoparticles embed onto functionalized MCM-41 and magnetic MCM-41 for catalytic purposes.

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Selective Photoelectrochemical Oxidation of Glycerol to Glyceric Acid on (002) Facets Exposed WO₃ Nanosheets

Xiao,

Wang,

Liu

et al. 2024

Angewandte Chemie

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Glycerol is a byproduct of biodiesel production. Selective photoelectrochemical oxidation of glycerol to high value‐added chemicals offers an economical and sustainable approach to transform renewable feedstock as well as store green energy at the same time. In this work, we synthesized monoclinic WO3 nanosheets with exposed (002) facets, which could selectively oxidize glycerol to glyceric acid (GLYA) with a photocurrent density of 1.7 mA·cm‐2, a 73% GLYA selectivity and a 39% GLYA Faradaic efficiency at 0.9 V vs. reversible hydrogen electrode (RHE) under AM 1.5G illumination (100 mW·cm‐2). Compared to (200) facets exposed WO3, a combination of experiments and theoretical calculations indicates that the superior performance of selective glycerol oxidation mainly originates from the better charge separation and prolonged carrier lifetime resulted from the plenty of surface trapping states, lower energy barrier of the glycerol‐to‐GLYA reaction pathway, more abundant active sites and stronger oxidative ability of photogenerated holes on the (002) facets exposed WO3. Our findings show great potential to significantly contribute to the sustainable and environmentally friendly chemical processes via designing high performance photoelectrochemical cell via facet engineering for renewable feedstock transformation.

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Dehydration of glycerol to acrolein over Wells–Dawson and Keggin type phosphotungstic acids supported on MCM-41 catalysts

Cited by 90 publications

References 62 publications

Gas phase dehydration of glycerol to acrolein over NaHSO₄@Zr‐MCM‐41 catalyst

Gas phase dehydration of glycerol to acrolein over NaHSO₄@Zr‐MCM‐41 catalyst

Functionalized Ordered Mesoporous Silicas (MCM-41): Synthesis and Applications in Catalysis

Selective Photoelectrochemical Oxidation of Glycerol to Glyceric Acid on (002) Facets Exposed WO₃ Nanosheets

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Dehydration of glycerol to acrolein over Wells–Dawson and Keggin type phosphotungstic acids supported on MCM-41 catalysts

Cited by 90 publications

References 62 publications

Gas phase dehydration of glycerol to acrolein over NaHSO4@Zr‐MCM‐41 catalyst

Gas phase dehydration of glycerol to acrolein over NaHSO4@Zr‐MCM‐41 catalyst

Functionalized Ordered Mesoporous Silicas (MCM-41): Synthesis and Applications in Catalysis

Selective Photoelectrochemical Oxidation of Glycerol to Glyceric Acid on (002) Facets Exposed WO3 Nanosheets

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Product

Resources

About

Gas phase dehydration of glycerol to acrolein over NaHSO₄@Zr‐MCM‐41 catalyst

Gas phase dehydration of glycerol to acrolein over NaHSO₄@Zr‐MCM‐41 catalyst

Selective Photoelectrochemical Oxidation of Glycerol to Glyceric Acid on (002) Facets Exposed WO₃ Nanosheets