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- W2106609247 abstract "Das Reduktionsverhalten durch Auffällen hergestellter NiOAl2O3/SiO2-Katalysatoren wird durch die Phasenzusammensetzung (amorphe Nickelschicht-und alumoschichtsilicate, Nickelspinelle, Nickeloxid) und durch die Unterschiede in der Zusammensetzung zwischen Volumen und Oberfläche bestimmt. TPR-Messungen, Bestimmungen des Reduktionsgrades und der Nickelpartikelgrößen durch statische magnetische Messungen zeigten, daß bei geringen Al2O3-Gehalten die Reduzierbarkeit der NiOAl2O3/SiO2-Katalysatoren erhöht und die Nickeldispersität vermindert wird. Die Abnahme der Reduzierbarkeit bei Al2O3-Gehalten >5 Mol-% wird durch die Bildung von Nickelspinellen und durch die Abnahme der NiII-Ionenoberflächenkonzentration verursacht. Studies on Nickel Oxide Mixed Catalysts. XVI. Reduction Behaviour of Amorphous NiOAl2O3/SiO2 Catalysts The reduction behaviour of NiOAl2O3/SiO2 catalysts prepared by precipitationdeposition is influenced by the phase composition (amorphous nickel layersilicates and nickel alumino layersilicates, nickel spinels, nickel oxide) and the differences of the composition between surface and bulk. TPR measurements, determinations of the reduction degree, and the nickel particle sizes by static magnetic measurements showed that the reducibility of the NiOAl2O3/SiO2 catalysts is enhanced and the nickel dispersity is decreased at low Al2O3 contents. The decrease of the reducibility at Al2O3 contents >5 mole% is caused by the formation of nickel spinels and the decrease of the NiII ion surface concentration." @default.
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- W2106609247 date "1987-07-01" @default.
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- W2106609247 title "Untersuchungen an Nickeloxid-Mischkatalysatoren. XVI. Reduktionsverhalten amorpher NiO?Al2O3/SiO2-Katalysatoren" @default.
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