Tailored Brønsted and Lewis surface acid sites of the phosphotungstic Wells Dawson heteropoly-acid

Matkovic, Silvana R.; Bosco, Marta V.; Collins, Sebastián E.; Briand, Laura E.

doi:10.1016/j.apsusc.2019.143565

Cited by 17 publications

(14 citation statements)

References 36 publications

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“…Figure b shows the nature of acid sites in the 50 (wt %) H 3 PW 12 O 40 /SiO 2 catalyst sample elucidated by pyridine-FTIR. The adsorption bands at 1455 cm –1 were attributed to coordinated pyridine adsorption on the Lewis acid sites (L), while the adsorption bands at 1545 cm –1 are attributed to the Bro̷nsted acid sites (B). , Active W metal sites of H 3 PW 12 O 40 /SiO 2 impart the Lewis acid sites, while the Bro̷nsted acid sites are imparted by the charge balancing protons within the H 3 PW 12 O 40 framework. , Thus, the H 3 PW 12 O 40 /SiO 2 catalyst revealed to comprise both Lewis and Bro̷nsted acid sites.…”

Section: Resultsmentioning

confidence: 97%

“…a Recovered after the fourth catalytic cycle.imparted by the charge balancing protons within the H 3 PW 12 O 40 framework 37,38. Thus, the H 3 PW 12 O 40 /SiO 2 catalyst revealed to comprise both Lewis and Bro̷ nsted acid sites.…”

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confidence: 99%

“…The catalyst was separated after each catalytic cycle and dried in a vacuum oven at 120 °C for 4 h to remove moisture or adsorbed compounds, if any. 38 The obtained catalyst sample was used in the next batch with a fresh reactant. The catalyst was found to be stable for three catalytic cycles with a nearly identical LA yield of ∼51%.…”

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confidence: 99%

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One-Pot Cascade Conversion of Renewable Furfural to Levulinic Acid over a Bifunctional H₃PW₁₂O₄₀/SiO₂ Catalyst in the Absence of External H₂

et al. 2020

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The conversion of biomass-derived furfural (FUR) to levulinic acid (LA), a versatile platform chemical, involves catalytic hydrogenation of FUR followed by acid hydrolysis to LA. However, this two-step process demands expensive separation and purification of the furfuryl alcohol (FAL) intermediate. Herein, we demonstrate an ingenious catalytic strategy for the one-pot cascade conversion of FUR to LA over a bifunctional catalyst without using pure external H2. Isopropyl alcohol (IPA) served a dual role as a hydrogen donor and solvent while inhibiting the side reactions. Catalysts with a tunable surface area and acidity were synthesized by impregnating different percentages of H3PW12O40 (heteropolyacid) over a SiO2 support. The bifunctionality of the H3PW12O40/SiO2 catalyst is ascribed to the mutual coexistence of Lewis and Bro̷nsted acid sites. The Lewis acid sites imparted by active W metal sites adsorb hydrogen proton for catalytic transfer hydrogenation of FUR to FAL, while the predominant Bro̷nsted acid sites catalyze the hydrolysis of FAL to LA. Consequently, H3PW12O40/SiO2 revealed to be a potential catalyst producing an ∼51% LA yield under optimized reaction conditions. Moreover, the catalyst was found to be reusable for three catalytic cycles. This study paves the way to develop future biorefinery, particularly direct conversion of FUR to LA over a bifunctional catalyst with a liquid H-donor, in an environmentally benign manner and comply with the green chemistry principles.

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Section: Resultsmentioning

confidence: 97%

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confidence: 99%

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One-Pot Cascade Conversion of Renewable Furfural to Levulinic Acid over a Bifunctional H₃PW₁₂O₄₀/SiO₂ Catalyst in the Absence of External H₂

et al. 2020

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“…9,10 The Brønsted solid acid catalyst primarily includes zeolite, MOF, ZrO 2 /SO 4 2À , WO 3 /ZrO 2 , and heteropoly acid. [11][12][13][14][15] Jiang et al…”

Section: Introductionmentioning

confidence: 99%

“…The Brønsted solid acid catalyst primarily includes zeolite, MOF, ZrO 2 /SO 4 2− , WO 3 /ZrO 2 , and heteropoly acid. 11–15 Jiang et al synthesized sulfated metal–organic framework-808, which was used in various acid-catalyzed reactions, including Friedel–Crafts (FC) acylation, esterification, and isomerization. 16 Nguyen et al fabricated tungstated zirconia solid acid catalysts for cellulose conversion in hydrothermal conditions and showed that uncalcined ZrW exhibited higher catalytic activity and stability than the calcined ZrW catalyst.…”

Section: Introductionmentioning

confidence: 99%

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

Liang

Huang

et al. 2022

RSC Adv.

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Al‐modified Mesoporous SiO₂‐matrix‐supported Uniform CeO₂ Nanodots with Superior Catalytic Efficiency in DCE Combustion

et al. 2022

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Adjusting the acidity and/or oxygen species on the surface of metal oxide nanostructures could fabricate the high active and durable catalysts for the combustion of chlorinated volatile organic compounds (CVOCs). Herein, Al‐modified mesoporous SiO2 matrix supported uniform CeO2 nanodots (CeO2@xAlSiO2) was synthesized and evaluated in dichloroethane (DCE) catalytic combustion. From the systematic study of the texture structure, surface properties, and catalytic activity, we deduced that the improved surface acidity and oxygen species activity enhanced the DCE conversion and reduced the formation of chlorinated organic byproduct, while increasing the formation of the desired product, HCl. The optimized CeO2@0.5AlSiO2 sample showed superior activity (90 % conversion of DCE at 260 °C), excellent durability (at 280 °C for 60 h) and good tolerance towards moisture (in 1 % and 3 % moisture for 10 h, respectively). Our work identified the important role of surface acidity and oxygen species over these functionalized catalysts, providing guidance for the advanced catalyst design.

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Tailored Brønsted and Lewis surface acid sites of the phosphotungstic Wells Dawson heteropoly-acid

Cited by 17 publications

References 36 publications

One-Pot Cascade Conversion of Renewable Furfural to Levulinic Acid over a Bifunctional H₃PW₁₂O₄₀/SiO₂ Catalyst in the Absence of External H₂

One-Pot Cascade Conversion of Renewable Furfural to Levulinic Acid over a Bifunctional H₃PW₁₂O₄₀/SiO₂ Catalyst in the Absence of External H₂

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

Al‐modified Mesoporous SiO₂‐matrix‐supported Uniform CeO₂ Nanodots with Superior Catalytic Efficiency in DCE Combustion

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Tailored Brønsted and Lewis surface acid sites of the phosphotungstic Wells Dawson heteropoly-acid

Cited by 17 publications

References 36 publications

One-Pot Cascade Conversion of Renewable Furfural to Levulinic Acid over a Bifunctional H3PW12O40/SiO2 Catalyst in the Absence of External H2

One-Pot Cascade Conversion of Renewable Furfural to Levulinic Acid over a Bifunctional H3PW12O40/SiO2 Catalyst in the Absence of External H2

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

Al‐modified Mesoporous SiO2‐matrix‐supported Uniform CeO2 Nanodots with Superior Catalytic Efficiency in DCE Combustion

Contact Info

Product

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One-Pot Cascade Conversion of Renewable Furfural to Levulinic Acid over a Bifunctional H₃PW₁₂O₄₀/SiO₂ Catalyst in the Absence of External H₂

One-Pot Cascade Conversion of Renewable Furfural to Levulinic Acid over a Bifunctional H₃PW₁₂O₄₀/SiO₂ Catalyst in the Absence of External H₂

Al‐modified Mesoporous SiO₂‐matrix‐supported Uniform CeO₂ Nanodots with Superior Catalytic Efficiency in DCE Combustion