Remarkable acceleration of the fructose dehydration over the adjacent Brønsted acid sites contained in an MFI-type zeolite channel

Wang, Meng; Xia, Yifen; Zhao, Li; Song, Chenhai; Peng, Luming; Guo, Xuefeng; Xue, Nianhua; Ding, Weiping

doi:10.1016/j.jcat.2014.08.008

Cited by 18 publications

(16 citation statements)

References 45 publications

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“…Adjacent acid sites are common on solid surfaces with high acid site concentrations. We demonstrated previously that the simultaneous interaction of two adjacent Brønsted acid sites with one fructose molecule in MFI-zeolites increased the dehydration rate for HMF production [38] . Similarly, it was established that adjacent Brønsted acid sites in zeolites cooperatively activate alkanes to change the reaction pathways and rates of protolytic alkane cracking [39] .…”

Section: Introductionmentioning

confidence: 84%

Adjacent acid sites cooperatively catalyze fructose to 5-hydroxymethylfurfural in a new, facile pathway

Xia

Zhang

Shi

et al. 2020

Journal of Energy Chemistry

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Section: Introductionmentioning

confidence: 84%

Adjacent acid sites cooperatively catalyze fructose to 5-hydroxymethylfurfural in a new, facile pathway

Xia

Zhang

Shi

et al. 2020

Journal of Energy Chemistry

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“…Thus, the strongest acidic sites act to generate the highest dehydration rate and the higher rate of dehydration prevents fructose side reactions, as well as condensation reactions from HMF [43]. It is claimed that a higher density of Brønsted sites increases the number of positive charges in fructose, accelerating the catalytic process and increasing selectivity [44]. However, this amount of Brønsted sites should be of adequate strength, even though only the strength does not explain the observed selectivity or even the conversion order of the aluminosilicates.…”

Section: Crystalline and Amorphous Aluminosilicate Materialsmentioning

confidence: 99%

Dehydration of Fructose to 5-Hydroxymethylfurfural: Effects of Acidity and Porosity of Different Catalysts in the Conversion, Selectivity, and Yield

et al. 2021

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There is a demand for renewable resources, such as biomass, to produce compounds considered as platform molecules. This study deals with dehydration of fructose for the formation of 5-hydroxymethylfurfural (HMF), a feedstock molecule. Different catalysts (aluminosilicates, niobic acid, 12-tungstophosphoric acid—HPW, and supported HPW/Niobia) were studied for this reaction in an aqueous medium. The catalysts were characterized by XRD, FT-IR, N2 sorption at −196 °C and pyridine adsorption. It was evident that the nature of the sites (Brønsted and Lewis), strength, quantity and accessibility to the acidic sites are critical to the conversion and yield results. A synergic effect of acidity and mesoporous area are key factors affecting the activity and selectivity of the solid acids. Niobic acid (Nb2O5·nH2O) revealed the best efficiency (highest TON, yield, selectivity and conversion). It was determined that the optimum acidity strength of catalysts should be between 80 to 100 kJ mol−1, with about 0.20 to 0.30 mmol g−1 of acid sites, density about 1 site nm−2 and mesoporous area about 100 m2 g−1. These values fit well within the general order of the observed selectivity (i.e., Nb2O5 > HZSM-5 > 20%HPW/Nb2O5 > SiO2-Al2O3 > HY > HBEA).

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“…The same cooperative catalysis by adjacent Brønsted acid sites has been also recently observed in fructose dehydration catalysed by HZSM5. 38 The authors reported that the multiple nearby sites can interact simultaneously with one reactant molecule to favour its activation. In our case, the favourable interaction of the catalyst surface with the polyfunctional diacetins could explain the higher reactivity to promote the esterification of the third hydroxyl group of glycerol with the nearby activated acetic acid and hence provoking an increased triacetin selectivity.…”

Section: Comparison Of Several Solid Acid Catalystsmentioning

confidence: 99%

Biobased catalyst in biorefinery processes: sulphonated hydrothermal carbon for glycerol esterification

Calle

Fraile

García‐Bordejé

et al. 2015

Catal. Sci. Technol.

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Sulphonated hydrothermal carbon (SHTC), obtained from D-glucose by mild hydrothermal carbonisation and subsequent sulphonation with sulphuric acid, is able to catalyse the esterification of glycerol with different carboxylic acids, namely, acetic, butyric and caprylic acids. Product selectivity can be tuned by simply controlling the reaction conditions. On the one hand, SHTC provides one of the best selectivity towards monoacetins described up to now without the need for an excess of glycerol. On the other hand, excellent selectivity towards triacylglycerides (TAG) can be obtained, beyond those described with other solid catalysts, including well-known sulphonic resins. Recovery of the catalyst showed partial deactivation of the solid. The formation of sulphonate esters on the surface, confirmed by solid state NMR, was the cause of this behaviour. Acid treatment of the used catalyst, with subsequent hydrolysis of the surface sulphonate esters, allows SHTC to recover its activity. The higher selectivity towards mono-and triesters and its renewable origin makes SHTC an attractive catalyst in biorefinery processes.

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Remarkable acceleration of the fructose dehydration over the adjacent Brønsted acid sites contained in an MFI-type zeolite channel

Cited by 18 publications

References 45 publications

Adjacent acid sites cooperatively catalyze fructose to 5-hydroxymethylfurfural in a new, facile pathway

Adjacent acid sites cooperatively catalyze fructose to 5-hydroxymethylfurfural in a new, facile pathway

Dehydration of Fructose to 5-Hydroxymethylfurfural: Effects of Acidity and Porosity of Different Catalysts in the Conversion, Selectivity, and Yield

Biobased catalyst in biorefinery processes: sulphonated hydrothermal carbon for glycerol esterification

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