Structural, thermal and thermodynamic properties of some Ln-Pd oxides and their behaviour as catalyst precursors
1999 (English)Doctoral thesis, comprehensive summary (Other academic)
The structural, thermal and thermodynamic properties of some Ln-Pd oxides of the Ln4Pd07 type are presented. The main results are; (i) Reduction of Ln4Pd07, either ex-situ by CO or in-situ by a synthetic car exhaust gas, results in a materialwith catalytic activity for car exhaust gas clean-up reactions. The obtained material consists of Pd nanoparticles situated on the surface of micron-sized grains of Ln2O3 Upon heat treatment of the reduced material in air, Lu4Pd07 i srapidly re-formed. This property May be utilised for reactivation/conditioning of aged Ln4Pd07-based catalysts; (ii) The Ln4Pd07 compounds with Ln = Nd, Sm, Eu and Gd dare isostructural and have a structure which is a triclinic distortion of the monoclinic La4Pd07 type; (iii) ΔH°, and ΔS ° f values for La4Pd07 and Nd4Pd07 have been calculated by a combination of data obtained from dissolution calorimetry and thermogravimetric analysis studies; ( iv ) Carbon nanotubes, having the so-called fishbone structure, can be prepared by heat treatment o f La4Pd07 in a 20% CO/He gas mixture for an extended period of time. Nanotubes have been extracted from the obtained La203/Pd/nanotube mixture, using a wet-chemical method.
Place, publisher, year, edition, pages
Stockholm: Stockholm University , 1999. , 62 p.
Research subject Inorganic Chemistry
IdentifiersURN: urn:nbn:se:su:diva-64279ISBN: 91-7153-988-3OAI: oai:DiVA.org:su-64279DiVA: diva2:456708
West, A.R., Professor
Härtill 5 uppsatser2011-11-152011-11-152016-10-20Bibliographically approved