fulltext.study @t Gmail

Preparation, active phase composition and Pd content of perovskite-type oxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
48199 46496 2008 9 PDF Available
Title
Preparation, active phase composition and Pd content of perovskite-type oxides
Abstract

Perovskite-type oxides, containing Pd, were prepared via a combined sol–gel and combustion synthesis method and were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and BET specific surface area (SSA). Their activity as three-way catalysts for the abatement of carbon monoxide, methane and nitrogen oxides, emitted from stoichiometrically operating natural-gas-fuelled vehicles, was investigated under simulated exhaust conditions. The preparation conditions concerning the complexing agent, the use of additives and the thermal treatment of the precursor solutions, were investigated. The La0.91Mn0.85Ce0.24Pd0.05Oz and La1.034Mn0.966Pd0.05Oz phases were the most active. Their activation by high-temperature hydrothermal treatment was ascribed to the migration of Pd out of the perovskite lattice and the formation of segregated PdO. The role of Pd was crucial for the catalytic activity of the active phase. A low Pd content favored the dispersion of oxidized Pdx+, 2 ≤ x ≤ 4, and thus, enhanced catalytic activity. Oxidized Pdx+ with x > 2 appeared to be less active than Pd2+. The catalytic activity of La1.034Mn0.966Pd0.05Oz increased significantly when 8 ppm SO2 were introduced in the reaction mixture.

Keywords
Pd catalyst; Pd-perovskites; Natural gas vehicles
First Page Preview
Preparation, active phase composition and Pd content of perovskite-type oxides
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 3–4, 1 December 2008, Pages 607–615
Authors
, , , ,
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