Preparation, characterization, and application of ordered mesoporous S2O82−/ZrO2–SiO2 with high specific surface area

Zhang, Zhi; Ke, Yi-Hu

doi:10.1007/s10934-019-00822-x

Cited by 8 publications

(5 citation statements)

References 49 publications

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“…The absorption bands typical of pyridine adsorbed at the Brønsted acid sites (1544 cm −1 , marked as B) and Lewis acid sites (1606 and 1446 cm −1 , marked as L) appear in the spectrum. [ 41,42 ] As shown in Table 3, the introduction of different sulphur sources indeed has a great effect on the acidity of catalysts. The L acid sites of catalysts impregnated with the S 2 O 8 2− group were significantly higher than those of

{normalS}_{0.5} {normalF}_{2.0} {normalC}_{0.5} Z

catalysts regardless of the metal promoter.…”

Section: Resultsmentioning

confidence: 99%

Acid‐free and highly efficient one‐step nitration of naphthalene with NO₂ promoted by O₂‐Ac₂O in Fe‐ and Cu‐modified S₂O₈²⁻/ZrO₂ catalyst to 1,5‐dinitronaphthalene under mild conditions

Yan,

Zhang,

Zhao

et al. 2024

Can J Chem Eng

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It is crucial to develop an acid‐free, mild, and efficient strategy for preparing 1,5‐dinitronaphthalene (1,5‐DNN) from naphthalene (NT). This work presented a one‐step NT nitration method using NO2 conjugated to an O2‐Ac2O system over Fe‐/Cu‐modified S2O82−/ZrO2 catalyst (). The effects of different nitration systems and Fe‐/Cu‐modified ZrO2 with various sulphur sources on NT nitration have been studied. Under optimal conditions, 99.5% of the NT conversion with 56.9% selectivity to 1,5‐DNN was obtained. Synergistic catalysis between the strong acid site and the current nitration system remarkably improved the 1,5‐DNN selectivity. The characterization results demonstrated that the appropriate Fe/Cu metals loadings combined with the covalent persulphates promoted the formation of more active tetragonal ZrO2. Chemical bonding of Zr4+ with S2O82− species allowed S6+ more electrons to withdraw than in SO42− species, which led to stronger acidity and better catalytic activity in the catalyst. Moreover, a plausible catalytic nitration reaction mechanism was proposed. The findings revealed that mild reaction conditions, combined with a solid superacid catalyst and NO2‐O2‐Ac2O system, offer significant advantages in reducing acid wastewater discharge and increasing target product selectivity.

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{normalS}_{0.5} {normalF}_{2.0} {normalC}_{0.5} Z

catalysts regardless of the metal promoter.…”

Section: Resultsmentioning

confidence: 99%

Acid‐free and highly efficient one‐step nitration of naphthalene with NO₂ promoted by O₂‐Ac₂O in Fe‐ and Cu‐modified S₂O₈²⁻/ZrO₂ catalyst to 1,5‐dinitronaphthalene under mild conditions

Yan,

Zhang,

Zhao

et al. 2024

Can J Chem Eng

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“…In addition, the peaks at 1490 cm À1 further confirmed the presence of Lewis acid sites in the catalysts. [28,53] Absorption peaks were observed at 1540 cm À1 , indicating the presence of Brønsted acid sites. [41,54] The proportion and quantity of Brønsted acid and Lewis acid sites are listed in Reaction time and temperature are vital factors that must be investigated to achieve optimal reaction conditions.…”

Section: The Pyridine Infrared Spectra (Py-ftir) Of the Three Catalystsmentioning

confidence: 99%

“…[ 24–27 ] However, the traditional M x O y /SO 4 2− catalysts exhibit small surface areas so the number of active sites is limited and the activity is low. [ 28 ]…”

Section: Introductionmentioning

confidence: 99%

“…[24][25][26][27] However, the traditional M x O y /SO 4 2À catalysts exhibit small surface areas so the number of active sites is limited and the activity is low. [28] Studies have reported that the existence of pores in heterogeneous catalysts has multiple benefits, including increasing their accessible surface area, improving tunability through manipulation of pore size, promoting the accessibility of active sites, reducing the mass transfer resistance of macromolecules in a limited space, and increasing the diffusion rates of reactants and products. [29,30] Current studies have indicated that various template methods can be used to prepare crystalline porous oxides.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of 5‐ethoxymethylfurfural from glucose catalyzed by porous tetra‐component metal oxides solid acid

Zhang

Sun

et al. 2022

Can J Chem Eng

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The production of 5-ethoxymethylfurfural (EMF) from cheap and abundant glucose feedstock has attracted a great deal of attention because of its potential applications. Herein, three porous tetra-component metal oxide solid acid catalysts (SO 4 2À /ZFSA-A, SO 4 2À /ZFSA-F-10, SO 4 2À /ZFSA-F-20)containing both Brønsted and Lewis acid sites have been successfully synthesized and can efficiently catalyze the synthesis of EMF from glucose.Particularly, the SO 4 2À /ZFSA-A, SO 4 2À /ZFSA-F-10, and SO 4 2À /ZFSA-F-20 catalysts were prepared under the template of sodium alginate, 10% F127, and 20% F127, respectively. The prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), N 2 -adsorption-desorption isotherm, X-ray photoelectron spectroscopy (XPS), thermogravimetry (TG), temperature-programmed desorption of ammonia (NH 3 -TPD), and pyridine infrared spectra (Py-FTIR). The characterization results indicated that all three catalysts have a porous structure. The pore distribution of the SO 4 2À /ZFSA-A catalyst is mainly macroporous and mesoporous, while the SO 4 2À /ZFSA-F-10 and SO 4 2À /ZFSA-F-20 catalysts are mainly mesoporous. The SO 4 2À /ZFSA-F-20 catalyst exhibited the highest catalytic performance due to its large specific surface area, desirable mesoporous structure, high total acidity (especially strong and super strong acidity), and appropriate Lewis/Brønsted acid ratio. By applying SO 4 2À / ZFSA-F-20, the formation of EMF from glucose was successfully catalyzed and EMF was obtained at a yield of 34.56% after 12 h at 160 C. This yield is much higher compared with most other results achieved by solid acids catalysis. In addition, the reaction parameters such as reaction temperature, reaction time, glucose amount, and catalyst dosage were shown to have a significant effect on the catalytic performance. Notably, the SO 4 2À /ZFSA-F-20 catalyst exhibited good reusability, as its activity did not significantly diminish after four rounds of repeated experiments and was successfully reactivated after calcination.

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“…These reveal that a feasible catalyst not only needs to be highly selective but also easy to recover. Other studies have discovered a multitude of bifunctional heterogeneous carbonaceous catalysts including S2O8 2-/ZrO2-SiO2-Sm2O3, HY zeolite, Ru-Al-SBA-15, AlNbOPO4, Fe-resin, CP-SO3H-1.69, and Amberlyst 70 [7] that have larger surface area for the exposure of actives sites to the feedstock, hence enhancing the conversion of cellulose to LA. Despite improved yield and extended lifespan of catalysts, carbonaceous catalysts are more costly than mineral acids.…”

Section: Introductionmentioning

confidence: 99%

The Interplay of Brønsted-Lowry and Lewis Acid Sites in Bifunctional Catalyst for the Biomass Conversion to Levulinic Acid

Azlan,

Yap,

Tiong

et al. 2023

JBBBE

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The integration of phosphotungstic acid and niobium oxide forms a bifunctional catalyst that demonstrates an interplay between Brønsted-Lowry and Lewis acid which is able to provide a synergistic effect for the conversion of biomass to LA. This bifunctional acid catalyst shows a higher yield of levulinic acid (LA) (16.4%) as compared to that of sole phosphotungstic acid (10.5%) or niobium oxide (13.2%), presumably caused by a higher selectivity at the tandem steps of the conversion reaction. The bifunctional catalyst was then doped to a lignin-derived carbon cryogel to mitigate the deactivation and leaching of the catalysts. The durability and thermal stability of the carbon cryogel allow the catalyst to recycle up to 3 times while retaining similar performance.

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Preparation, characterization, and application of ordered mesoporous S2O82−/ZrO2–SiO2 with high specific surface area

Cited by 8 publications

References 49 publications

Acid‐free and highly efficient one‐step nitration of naphthalene with NO₂ promoted by O₂‐Ac₂O in Fe‐ and Cu‐modified S₂O₈²⁻/ZrO₂ catalyst to 1,5‐dinitronaphthalene under mild conditions

Acid‐free and highly efficient one‐step nitration of naphthalene with NO₂ promoted by O₂‐Ac₂O in Fe‐ and Cu‐modified S₂O₈²⁻/ZrO₂ catalyst to 1,5‐dinitronaphthalene under mild conditions

Synthesis of 5‐ethoxymethylfurfural from glucose catalyzed by porous tetra‐component metal oxides solid acid

The Interplay of Brønsted-Lowry and Lewis Acid Sites in Bifunctional Catalyst for the Biomass Conversion to Levulinic Acid

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Preparation, characterization, and application of ordered mesoporous S2O82−/ZrO2–SiO2 with high specific surface area

Cited by 8 publications

References 49 publications

Acid‐free and highly efficient one‐step nitration of naphthalene with NO2 promoted by O2‐Ac2O in Fe‐ and Cu‐modified S2O82−/ZrO2 catalyst to 1,5‐dinitronaphthalene under mild conditions

Acid‐free and highly efficient one‐step nitration of naphthalene with NO2 promoted by O2‐Ac2O in Fe‐ and Cu‐modified S2O82−/ZrO2 catalyst to 1,5‐dinitronaphthalene under mild conditions

Synthesis of 5‐ethoxymethylfurfural from glucose catalyzed by porous tetra‐component metal oxides solid acid

The Interplay of Brønsted-Lowry and Lewis Acid Sites in Bifunctional Catalyst for the Biomass Conversion to Levulinic Acid

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Product

Resources

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Acid‐free and highly efficient one‐step nitration of naphthalene with NO₂ promoted by O₂‐Ac₂O in Fe‐ and Cu‐modified S₂O₈²⁻/ZrO₂ catalyst to 1,5‐dinitronaphthalene under mild conditions

Acid‐free and highly efficient one‐step nitration of naphthalene with NO₂ promoted by O₂‐Ac₂O in Fe‐ and Cu‐modified S₂O₈²⁻/ZrO₂ catalyst to 1,5‐dinitronaphthalene under mild conditions