Metal-Support Interactions in the Pt/MgO System
作者： J. Adamiec , S.E. Wanke , B. Tesche , U. Klengler
DOI: 10.1016/S0167-2991(09)61379-3
关键词:
摘要: Resume La comparaison des resultats de la chimisorption l'hydrogene et microscopie electronique a transmission catalyseurs Pt/MgO montre que temperature reduction agit fortement sur capacite adsorbe par le Pt. quantite d'hydrogene adsorběe est tres decroissante, si elevee, mais les MET ne montrent effets insignifiants distribution taille particules Donc, interactions electroniques doivent avoir lieu entre Pt MgO suite destemperatures plus elevees. Le traitement sous oxygene 550 650° C aboutit formation complexes PtO x -Mgo surfaces. Une diminution obtenue qui ont ete traites O 2 550° C. Abstract Comparison of hydrogen chemisorption and electron microscopy results for catalysts has shown that the strongly influences adsorption capacity platinum. Hydrogen uptakes decrease significantly when is increased from 300 to 500° C, but TEM show only minor effects on platinum crystallite size distributions. Hence, electronic have occur between as result at elevated temperatures. Treatment in oxygen -MgO surface complexes. Decreases sizes can be achieved by after treatment
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