Experimental and theoretical study of ZrMo-KIT-6 solid acid catalyst with abundant Brønsted acid sites

Mu, Jinglin; Liang, Manfen; Huang, Hong; Meng, Jian; Xu, Leilei; Song, Zhiling; Wu, Mei; Miao, Zhichao; Zhuo, Shuping; Zhou, Jin

doi:10.1039/d2ra00586g

Cited by 6 publications

(1 citation statement)

References 69 publications

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“…In addition to being moisture-sensitive, degradation, polymerization, and isomerization of products occur due to the highly acidic nature of these catalysts. This penalty induces a severe reduction in the expected primary product yield. − Particularly, we have to underline that Friedel–Crafts (FC) benzylation of anisole is generally favored while employing Brønsted acid sites. − However, new and both more sustainable and environmentally friendly catalytic methods are gradually replacing these traditional catalysts. As such, enzymes , and mesoporous materials such as zeolites , are also employed in Friedel–Crafts alkylation reactions.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Porous WO₃@SiO₂ Self-Standing Monolithic Catalysts and Their Efficient Cycling “Cosolvent-Free” Friedel–Crafts Alkylation/Acylation Catalytic Properties

Vardon,

Layan,

Louërat

et al. 2023

Chem. Mater.

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Taking advantage of tungsten oxide inherent Brønsted–Lewis acidity, the first series of WO3–SiO2(HIPE) monolithic (MUB-104(x) series) catalysts bearing multiscale porosity have been designed through integrative chemistry. At the microscopic length scale, beyond X-ray diffraction (XRD) revealing the WO3 monoclinic structure, local electron spin resonance (ESR) spectroscopy addresses g values clearly located at the frontier between extended WO3 phases and polyanion clusters, in agreement with scanning transmission electron microscopy high-angle annular dark field (STEM-HAADF) investigations. NH3-TPD shows that when the tungsten loading is increased from 10 wt % for MUB-104(1) to 24 wt % for MUB-104(3), the amount of acidic sites significantly decreases from 0.35 to 0.08 mmol of NH3 g–1, respectively, in agreement with the particle sizes. The MUB-104(x) series offers efficient cosolvent-less heterogeneous cycling catalysis toward both Friedel–Crafts alkylation and acylation syntheses. MUB-104(1) carries the highest turnover number (TON) of 121 and turnover frequency (TOF) of 20 h–1, while for acylation, MUB-104(1) carries the highest TON of 117 and TOF of 26 h–1. Besides, we find out that the catalysts offer good selectivity, where 30/70% of ortho- and para-substituted alkylated products are obtained. Considering the acylation reaction, the selectivity is even higher, reaching 100% toward the para-substituted acylated product. The catalyst, due to its intrinsic monolithic character, can be easily extracted from the reactive media, recycled, and re-employed further.

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Section: Resultsmentioning

confidence: 99%

Hierarchical Porous WO₃@SiO₂ Self-Standing Monolithic Catalysts and Their Efficient Cycling “Cosolvent-Free” Friedel–Crafts Alkylation/Acylation Catalytic Properties

Vardon,

Layan,

Louërat

et al. 2023

Chem. Mater.

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Conversion of Neem Oil (Azadirachta indica) to Biodiesel over SBA-15 Supported Sulphated Zirconia Catalysts

Dhinagaran,

Vijayakumar,

Prashanna Suvaitha

et al. 2023

Catal Lett

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Zr-KIT-6 catalyzed renewable synthesis of N-aryl pyrroles for producing bioactive synthetic compounds

Manal

Srivastava

2023

Applied Catalysis A: General

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Experimental and theoretical study of ZrMo-KIT-6 solid acid catalyst with abundant Brønsted acid sites

Abstract: Synergistic effect of Zr and Mo species in the formation of Brønsted acid sites is investigated by experimental and theoretical study.

Cited by 6 publications

References 69 publications

Hierarchical Porous WO₃@SiO₂ Self-Standing Monolithic Catalysts and Their Efficient Cycling “Cosolvent-Free” Friedel–Crafts Alkylation/Acylation Catalytic Properties

Hierarchical Porous WO₃@SiO₂ Self-Standing Monolithic Catalysts and Their Efficient Cycling “Cosolvent-Free” Friedel–Crafts Alkylation/Acylation Catalytic Properties

Conversion of Neem Oil (Azadirachta indica) to Biodiesel over SBA-15 Supported Sulphated Zirconia Catalysts

Zr-KIT-6 catalyzed renewable synthesis of N-aryl pyrroles for producing bioactive synthetic compounds

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Experimental and theoretical study of ZrMo-KIT-6 solid acid catalyst with abundant Brønsted acid sites

Abstract: Synergistic effect of Zr and Mo species in the formation of Brønsted acid sites is investigated by experimental and theoretical study.

Cited by 6 publications

References 69 publications

Hierarchical Porous WO3@SiO2 Self-Standing Monolithic Catalysts and Their Efficient Cycling “Cosolvent-Free” Friedel–Crafts Alkylation/Acylation Catalytic Properties

Hierarchical Porous WO3@SiO2 Self-Standing Monolithic Catalysts and Their Efficient Cycling “Cosolvent-Free” Friedel–Crafts Alkylation/Acylation Catalytic Properties

Conversion of Neem Oil (Azadirachta indica) to Biodiesel over SBA-15 Supported Sulphated Zirconia Catalysts

Zr-KIT-6 catalyzed renewable synthesis of N-aryl pyrroles for producing bioactive synthetic compounds

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Hierarchical Porous WO₃@SiO₂ Self-Standing Monolithic Catalysts and Their Efficient Cycling “Cosolvent-Free” Friedel–Crafts Alkylation/Acylation Catalytic Properties

Hierarchical Porous WO₃@SiO₂ Self-Standing Monolithic Catalysts and Their Efficient Cycling “Cosolvent-Free” Friedel–Crafts Alkylation/Acylation Catalytic Properties