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• W2064454806 abstract "Transition alumina, with different La loadings, were synthesized from boehmite (AlOOH) hydrosols containing a PEO/PPO/PEO triblock copolymer (Pluronics® P123) and lanthanum nitrate. After calcination at 500 °C, the xerogels prepared from these sols have large specific surface area (≈400 m2/g) and very large porous volumes, increasing with the amount of La to reach 2.5 cm3/g for La/(La + Al) = 0.036. This material still kept a surface area close to 180 m2/g and a pore volume of 2.3 cm3/g when it was calcined at 1000 °C. However, after calcination at 1200 °C, the best textural properties (70 m2/g and 0.6 cm3/g) were observed for La/(La + Al) = 0.015. Larger La loadings led to the formation of LaAl11O18 and LaAlO3 and the detection of these mixed oxides was associated with a decrease of surface area and pore volume. The improvement of the thermal stability of these materials can be explained by the synergy of two effects: (i) the adsorption of copolymer onto fiber-like boehmite nanoparticles, preventing their compact rearrangement during the drying and maintaining a large porosity after calcination; (ii) the inhibition of the sintering process through the formation of thermally stable species between reactive surface sites (strong Lewis acid sites) and lanthanum atoms." @default.
• W2064454806 created "2016-06-24" @default.
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• W2064454806 date "2014-09-01" @default.
• W2064454806 modified "2023-10-15" @default.
• W2064454806 title "Thermal stabilization of alumina modified by lanthanum" @default.
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• W2064454806 doi "https://doi.org/10.1016/j.micromeso.2014.05.016" @default.
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