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- W2020134832 abstract "Abstract Pt-TiO2 Degussa catalysts are produced by a deposition-precipitation technique which continuously makes available hydroxyl ions via urea hydrolysis. The Pt dispersions, obtained with fairly uniform size distributions as seen by electron microscopy, consist of Pt clusters 25 ±4 A in size. Through photoelectron spectroscopy (ESCA), various Pt 4f 7 2 peaks have been detected which show different oxidation states for catalysts obtained under different experimental conditions. In situ measurements performed on these catalysts revealed Pto, Pt+2 and P+2 species, proving that positive centers Pt+n are formed and stabilized at the catalyst surface. Mesoporosity develops on TiO2 due to Pt deposition, showing 128 and 158 A mesopores. These discretely sized pores contribute to the specific pore volume of the TiO2 P-25 substrate, increasing the specific pore volume from 0.116 to 0.384 cm3 g−1 for a 1% Pt-loaded catalyst." @default.
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- W2020134832 date "1989-03-01" @default.
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- W2020134832 title "Porosity studies on an active Pt-Tio2 hydrogenation catalyst prepared by deposition techniques" @default.
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