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• W1566366703 abstract "As a part of an experimental program aimed at the systematic analysis of the controlled deposition of Pd/SiO2 on well characterized macroporous and microporous silica gels (Davison G-59, 254 m2 g−1 and G-03, 558 m2 g−1) the nature of the surface species upon drying and thermal decomposition of the tetramminepalladium complex (TPSiO) obtained by ion exchange (IE) of palladium acetate in aqueous ammonium hydroxide (Pd loading: 0.5–11%Pd ww), has been systematically followed by the combined use of diffuse reflectance spectroscopy (DRS), differential scanning calorimetry (DSC), thermogravimetric analysis (TG), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). DRS indicates that drying in air (T ≈ 393 K) leaves a stable diammmepalladium complex (DPSiO) on the surfaces. Decomposition of DPSiO upon calcination in inert and oxidizing atmospheres was studied from 308 to 773 K, with heating rates of 4–64 K min−1 (N2) and 2–32 K min−1 (air). Two decomposition zones are identified with DSC and TG. (1) In the low-temperature region (308–473 K) endothennal signals which correspond to a liberation of NH3 around 359 K (G-59) or 371 K (G-03) were observed; (2) the high-temperature region (473–773 K) only shows endothennal peaks when N2 is used, but in air several signals indicate that a sequence of transformations of the Pd occurs. Ultradispersed Pdo is the final product on both catalyst types when N2 is the decomposing atmosphere, whereas either a mixture of Pd°+[(SiO)2]2−Pd2+ (on the microporous G-03) or pure [(SiO)2]2− Pd2+ (on the macroporous G-59) are the final products when air is employed." @default.
• W1566366703 created "2016-06-24" @default.
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• W1566366703 date "1991-11-01" @default.
• W1566366703 modified "2023-10-11" @default.
• W1566366703 title "Preparation of Pd/SiO2 catalysts for methanoi synthesis" @default.
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• W1566366703 doi "https://doi.org/10.1016/0040-6031(91)87238-r" @default.
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