Iron incorporated Ia3d mesostructured silicate prepared at room temperature: Excellent Friedel–Crafts benzylation catalyst

Vasudevan, Srinivasan Vinju; Imran, Gaffar; Maheswari, R. Uma

doi:10.1016/j.matchemphys.2015.08.055

Cited by 5 publications

(2 citation statements)

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“…They have concluded that the presence of silica in any form can perform CTH reaction under base-free conditions. Similarly, base-free transfer hydrogenation of ketones and alkenes over Pd(0)@SBA-15 using 2-propanol or formic acid has been reported . In both the works, the presence of silica assisted base-free CTH.…”

Section: Resultsmentioning

confidence: 76%

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Unmodified Maghemite from River Sand as a Selective Catalyst for Base-Free Transfer Hydrogenation of Furfural, Levulinic Acid, and o-Vanillin: A Pathway for Sustainable Biomass Conversions

Vasanthakumar

Karvembu

2020

ACS Sustainable Chem. Eng.

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Iron is one of the cheapest and abundant metals on the earth’s crust. Both its oxides and metallic form are highly active as oxidation and reduction catalysts. Its oxide forms such as Fe2O3 and Fe3O4 are magnetically active at room temperature, making them easy for separation and reuse. Fe2O3 exists in 14 different phases; among them, α, β, and γ are well known. We have separated phase-pure γ-Fe2O3 from the river sand and confirmed it by X-ray diffraction and selected area electron diffraction analyses. Its morphology was understood by scanning electron microscopy and high-resolution transmission electron microscopy analyses. The unmodified γ-Fe2O3 obtained from the natural source was employed as a catalyst for the transfer hydrogenation of carbonyl and nitro compounds and biomass derivatives such as levulinic acid, furfural, and vanillin, without using a base. Further, to understand the advantage of γ-Fe2O3 recovered from the natural source, phase-pure α-, β-, and γ-Fe2O3 were synthesized and characterized and their catalytic activity was studied under identical conditions. To our delight, γ-Fe2O3 recovered from the natural source exhibited superior activity under base-free conditions.

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Section: Resultsmentioning

confidence: 76%

“…Similarly, base-free transfer hydrogenation of ketones and alkenes over Pd(0)@ SBA-15 using 2-propanol or formic acid has been reported. 62 In both the works, the presence of silica assisted base-free CTH. From the XPS analysis of R-γ-Fe 2 O 3 , it was found to contain about 12% of Fe and 7% of Si.…”

Section: ■ Results and Discussionmentioning

confidence: 96%