Preparation and characterisation ofPt/Al2O3 aerosol precursors as model Pt-emissions from catalytic converters

Autor: T. Rühle, H. Schneider, J. Find, D. Herein, N. Pfänder, U. Wild, R. Schlögl, D. Nachtigall, S. Artelt, U. Heinrich
Rok vydání: 1997
Předmět:
Zdroj: Applied Catalysis B: Environmental. 14:69-84
ISSN: 0926-3373
DOI: 10.1016/s0926-3373(97)00013-1
Popis: A model catalyst to simulate inorganic emissions from automotive catalyst was developed to study the toxicological potential of platinum particles. A 3–5% systemPt/Al2O3 was selected in order to achieve sufficient analytical sensitivity in later toxicological studies. A genuine support material (alumina), which was used in industrial automotive catalyst production, was impregnated, calcined and activated. The preparation procedure was optimised in a series of experiments in order to fulfil the special conditions imposed by the toxicology testing program. As the toxicological investigations represent a separate program, these experiments will not be discussed here but in separate work to be published by the co-authors. Sample were characterised by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray-photoelectron spectroscopy (XPS) and X-ray fluorescence analysis (XRFA). Furthermore, the thermal effects during activation were studied by differential scanning calorimetry (DSC) and by thermogravimetry/differential thermoanalysis (TG/DTA). The catalytic activity of the sample was tested using a CO oscillation as model reaction, investigated by ion-molecule mass spectrometry (IMR-MS). All experimental results, including the catalytic activity, prove the authenticity of the sample as a real automobile catalyst.
Databáze: OpenAIRE
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