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Effects of preparation and structure of cerium-zirconium mixed oxides on diesel soot catalytic combustion

Paper ID Volume ID Publish Year Pages File Format Full-Text
41121 45877 2012 9 PDF Available
Title
Effects of preparation and structure of cerium-zirconium mixed oxides on diesel soot catalytic combustion
Abstract

Mixed oxides of CexZr1−xO2 (0.1 ≤ x ≤ 0.9) were prepared by sol–gel method, in aqueous ammonia solution with CeCl3·7H2O and ZrOCl2·8H2O as precursors, and employed in diesel soot combustion. The catalysts were characterized by XRF/EDX, nitrogen adsorption, TGA/DTG, powder XRD, FTIR/DRIFTS and Raman. In addition, the acidity was evaluated by adsorption and desorption of pyridine. XRD indicated the formation of solid solutions that progressively distorted from cubic into tetragonal lattices. Raman studies confirmed that the Ce–O bonding was stronger in the mixed oxide series because of the cell contraction, as a result of the zirconium insertion. Ce0.8Zr0.2O2 was the most acidic and active material, shifting the combustion temperature (Tm) from 622 to 547 °C (loose contact) or 404 °C (tight contact). The calculated activation energy for the catalytic combustion of this optimized oxide attested that the combustion temperature was lower under all conditions, compared to the thermal process. The catalyst was utilized five times without any appreciable loss of activity and maintained its structural properties.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (146 K)Download as PowerPoint slideHighlights► Preparation of nanostructured materials. ► Mixed oxides of cerium-zirconium have distorted structures from cubic ceria. ► Raman spectra confirmed cell contraction as a result of zirconium insertion. ► Ce0.8Zr0.2O2 was the most acidic and had the best performance for soot combustion. ► Ce0.8Zr0.2O2 can be reutilized, with no loss of activity and maintenance of structure.

Keywords
Cerium-zirconium mixed oxide; Sol–gel method; Diesel soot combustion; Zirconia; Ceria
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Effects of preparation and structure of cerium-zirconium mixed oxides on diesel soot catalytic combustion
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 413–414, 31 January 2012, Pages 292–300
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