fulltext.study @t Gmail

The influence of promoters (Zr, La, Tb, Pr) on the catalytic performance of CuO-CeO2 systems for the preferential oxidation of CO in the presence of CO2 and H2O

Paper ID Volume ID Publish Year Pages File Format Full-Text
53430 46969 2015 11 PDF Available
Title
The influence of promoters (Zr, La, Tb, Pr) on the catalytic performance of CuO-CeO2 systems for the preferential oxidation of CO in the presence of CO2 and H2O
Abstract

•Ceria materials promoted with Zr, La, Tb, Pr have been prepared.•CuO (6 wt.% of Cu) supported on ceria promoted materials were tested in CO-PROX with λ = 2.•CO conversion follows the trend: 6CUZRCE > 6CUTBCE > 6CUPRCE > 6CUCE > 6CULACE.•Catalysts show resistance to the presence of CO2 and H2O in the feed.

CuO supported on CeO2 and Ce0.9X0.1O2, where X is Zr, La, Tb or Pr, were synthesized using nitrate precursors, giving rise ceria based materials with a small particle size which interact with CuO species generating a high amount of interfacial sites. The incorporation of cations to the ceria framework modifies the CeO2 lattice parameter, improving the redox behavior of the catalytic system. The catalysts were characterized by X-ray fluorescence spectrometry (XRFS), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, thermoprogrammed reduction with H2 (H2-TPR) and X-ray photoelectron spectroscopy (XPS). The catalysts were tested in the preferential oxidation of CO under a H2-rich stream (CO-PROX), reaching conversion values higher than 95% between 115 and 140 °C and being the catalyst with 6 wt.% of Cu supported on Ce0.9Zr0.1O2 (sample 6CUZRCE) the most active catalyst. The influence of the presence of CO2 and H2O was also studied simulating a PROX unit, taking place a decrease of the catalytic activity due to the inhibitor effect both CO2 and H2O.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (177 K)Download as PowerPoint slide

Keywords
Copper oxide; Cerium oxide; Rare earth doped ceria; Preferential CO oxidation; Hydrogen
First Page Preview
The influence of promoters (Zr, La, Tb, Pr) on the catalytic performance of CuO-CeO2 systems for the preferential oxidation of CO in the presence of CO2 and H2O
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 253, 15 September 2015, Pages 115–125
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis