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The size, shape, and dispersion of active sites on AC-supported copper nanocatalysts with polyol process: The effect of precursors

Paper ID Volume ID Publish Year Pages File Format Full-Text
43098 45955 2008 9 PDF Available
Title
The size, shape, and dispersion of active sites on AC-supported copper nanocatalysts with polyol process: The effect of precursors
Abstract

The polyol process is simple to conduct and can enhance the diffusion of active sites and control the shape of the active phase during catalyst preparation. Activated carbon (AC) was chosen as the support, and copper nitrate, copper acetate, and copper sulfate were used as precursors to prepare the AC-supported copper catalysts. Toluene was chosen as the pollutant for the activity test. The experimental results showed that the copper particles were nanosized and were highly dispersed on the AC; such dispersion improved the thermal stabilization of the AC-supported catalyst. The copper content observed in an inductively coupled plasma-mass spectrometer was the same even for increased amounts of copper sulfate; however, for the other two precursors, the copper content increased with the amount of precursor. Different precursors gave rise to different types of active phases. For example, when copper acetate was used as the precursor, the catalyst had pellet (50–70 nm)- and cubic (>1 μm)-shaped active phases. The activities of the copper catalysts were in the order copper nitrate > copper acetate > copper sulfate. Among the catalysts tested, Cu-N/Al2O3 with 5 wt.% Cu loading exhibited the highest activity at 158,720 h−1. For Al2O3-supported catalysts prepared by the polyol process, the Cu-A/Al2O3 catalyst exhibited the highest activity. Thus, the polyol process has the potential to be used in catalyst preparation along with various different precursors to control gaseous pollutants.

Graphical abstractThis study mainly focuses on the preparation of copper catalysts by the polyol process using different precursors (acetate, nitrate, and sulfate). The shapes and sizes of the particles of the catalysts formed with various precursors are not similar in the polyol process. The particle of Cu-A/AC contains two types of active phases: one is spherical (50–70 nm) and the other is cubic (>1 μm).Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Chemical synthesis; Electron microscopy; Diffusion; Oxidation
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The size, shape, and dispersion of active sites on AC-supported copper nanocatalysts with polyol process: The effect of precursors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 344, Issues 1–2, 15 July 2008, Pages 36–44
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us