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Large-scale synthesis of carbon nanofibers on Ni–Fe–Al hydrotalcite derived catalysts: I. Preparation and characterization of the Ni–Fe–Al hydrotalcites and their derived catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43048 45952 2008 11 PDF Available
Title
Large-scale synthesis of carbon nanofibers on Ni–Fe–Al hydrotalcite derived catalysts: I. Preparation and characterization of the Ni–Fe–Al hydrotalcites and their derived catalysts
Abstract

A series of Ni2+–Fe2+–Al3+ hydrotalcite (HT) catalysts with varying compositions have been prepared by coprecipitation from Fe2+. The structure and properties of the catalysts were carefully characterized by various methods such as XRD, EXAFS, TGA, TPR, N2 adsorption/desorption, XPS and H2 chemisorption. It was shown that pure HT structures can only be prepared at low Fe2+ concentrations, while mixed oxide phases with spinel structure will form simultaneously at high Fe2+ concentrations. Pure HT structures are very important for small particle size, narrow size distribution and large surface area of the resulting catalysts. XPS study demonstrated Fe enrichment on the catalyst surfaces, which might have partly contributed to the low hydrogen chemisorption capacity for the Fe-containing catalysts.

Graphical abstractNi2+–Fe2+–Al3+ hydrotalcite catalysts have been prepared by coprecipitation from Fe2+. Pure hydrotalcite structures can only be prepared at low Fe2+ concentrations, while mixed oxide phases with spinel structure will form at high Fe2+ concentrations. Pure hydrotalcite structures are very important for small particle size, narrow size distribution and large surface area of the resulting catalysts.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ni–Fe–Al; Hydrotalcite; Preparation; Characterization; Surface enrichment
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Large-scale synthesis of carbon nanofibers on Ni–Fe–Al hydrotalcite derived catalysts: I. Preparation and characterization of the Ni–Fe–Al hydrotalcites and their derived catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 338, Issues 1–2, 1 April 2008, Pages 136–146
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
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