The Pt-NiO catalysts over the metallic monolithic support for oxidation of carbon monoxide and hexane

The properties and catalytic activity of metallic monolithic 0.15%Pt/Al2O3/FeCr20Al5 catalysts with introduced by two different methods NiO addition in oxidation of CO and hexane were evaluated. The catalysts were prepared using a nitrate solution of Pt or chloroplatinic acid as metal precursors and characterized by BET, SEM, EDS, hydrogen chemisorption, TPR and XPS spectroscopy. It was found that the activity of the catalysts depends mainly on the preparation method, NiO content, platinum dispersion, the oxidation state of platinum and a type of the used Pt precursor. The best catalytic results, both for CO and hexane oxidation, were obtained using the chlorine-free platinum catalyst containing 0.13% NiO, deposited on Al2O3/FeCr20Al5 (0.15%Pt/0.13NiO/Al2O3/FeCr20Al5). The deposition of 0.13-0.39% NiO on the washcoat prevented deep Pt migration into the washcoat and' support. The activities of the 0.15%Pt/x%NiO-Al2O3 catalysts containing 5-15% of NiO in the washcoat in oxidation of CO and C6H14 were lower than the activity of the 0.15%Pt/x%NiO/Al2O3/FeCr20Al5 catalysts. (C) 2016 Elsevier B.V. All rights reserved.