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Structure and catalysis of layered Nb–W oxide constructed by the self-assembly of nanofibers

Paper ID Volume ID Publish Year Pages File Format Full-Text
54908 47030 2013 7 PDF Available
Title
Structure and catalysis of layered Nb–W oxide constructed by the self-assembly of nanofibers
Abstract

Treatment of crystalline Nb2O5–WOx fibers with an aqueous solution of oxalic or tartaric acid resulted in the formation of nanosheets with a layered structure in which fibers were self-assembled. The oxalic and tartaric acid-treated oxides had dense layered structures containing mesopores between the layers with mean diameters of 4.6 and 1.9 nm, respectively. These oxides exhibited much higher recyclability as catalysts for the Friedel-Crafts alkylation and acylation of anisole compared to untreated ones. Furthermore, no deactivation was observed in a continuous flow process for the reaction of anisole and benzyl alcohol at least over 87 days’ period in which turnover number = 33,000 was obtained. The improved catalytic performance was ascribed to the formation of layered structure, which was preserved during reactions.

Graphical abstractTreatment of crystalline Nb2O5–WOx fibers with an aqueous solution of oxalic or tartaric acid resulted in the formation of nanosheets with a layered structure in which fibers were self-assembled. The catalyst exhibited high activity and durability in the Friedel-Crafts reaction.Figure optionsDownload full-size imageDownload high-quality image (241 K)Download as PowerPoint slideHighlights► Nb2O5–WOx fibers were treated with an aqueous solution of oxalic or tartaric acid. ► The fibers self-assembled to yield nanosheet oxides with a layered structure having mesopores. ► No deactivation was observed in a continuous flow process.

Keywords
Niobium; Tungsten; Nano fibers; Layered structure; Friedel-Crafts reaction
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Structure and catalysis of layered Nb–W oxide constructed by the self-assembly of nanofibers
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 204, 15 April 2013, Pages 197–203
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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