| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 55772 | Catalysis Today | 2011 | 5 Pages |
In this article, La–Al2O3 and Ce0.65Zr0.30La0.05O2 were used as support to prepare palladium catalyst for methanol decomposition to synthesis gas at low temperature. The catalysts were characterized by nitrogen adsorption, X-ray diffraction (XRD), temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS) and NH3-temperature-programmed desorption (TPD). XPS results confirm that palladium exists as oxidation state in the two catalysts and has strong interaction with ceria–zirconia solid solution. The result of H2-TPR reveals that the reduction temperature of PdO slightly shifts to high temperature due to the strong interaction between palladium and Ce0.65Zr0.30La0.05O2. For Pd/Ce0.65Zr0.30La0.05O2 catalyst, the higher oxygen storage capacity is beneficial to the Pd species in a more active Pdδ+ state. Furthermore, the results of the methanol decomposition reaction show that the Pd/Ce0.65Zr0.30La0.05O2 catalyst has high catalytic activity. The conversion of methanol achieves 100% at 220 °C over Pd/Ce0.65Zr0.30La0.05O2.
Graphical abstractThe Pd 3d5/2 binding energy of PCZ catalyst is higher by 0.7 eV than that of PA. The valence of Pd species may be between 0 and +2 in PCZ catalyst, while the cationic species is considered to be highly active in the methanol decomposition.Figure optionsDownload full-size imageDownload high-quality image (167 K)Download as PowerPoint slideHighlights► Pd/Ce0.65Zr0.30La0.05O2 has excellent catalytic activity for methanol decomposition to carbon monoxide and hydrogen. ► There is strong interaction between palladium particles and the support in Pd/Ce0.65Zr0.30La0.05O2. ► Palladium in Pd/Ce0.65Zr0.30La0.05O2 catalyst is in cationic state. ► Pd/Ce0.65Zr0.30La0.05O2 catalyst has large OSC and is well dispersed. ► Pd/Ce0.65Zr0.30La0.05O2 catalyst has great potential for practical application.
