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- W2058331375 abstract "Abstract Three Ni–Al 2 O 3 catalysts, with nickel loadings of 10–13 wt.%, were prepared by co-precipitation (Ni–Al co-precip), impregnation on an in-house sol–gel derived alumina (Ni/sol–gel Al 2 O 3 ), and impregnation on a commercial γ-Al 2 O 3 (Ni/γ-Al 2 O 3 ). The catalysts were characterized by N 2 physisorption, H 2 chemisorption, TPR, XRD, SEM and TEM. The Ni species, Ni particle size, and Ni reducibility depended on the preparation method. The Ni–Al co-precip and Ni/sol–gel Al 2 O 3 catalysts contained NiAl 2 O 4 species after calcination, while the Ni/γ-Al 2 O 3 catalyst contained NiO and NiAl 2 O 4 species after calcination. Although the Ni/γ-Al 2 O 3 catalyst was the easiest to reduce, according to TPR, this catalyst had the lowest hydrogen uptake over a 100 h temperature-staged reduction experiment. The Ni–Al co-precip and Ni/sol–gel Al 2 O 3 catalysts had Ni dispersions of over 7% with reduction at 550 °C for 31 h, and maximum dispersions of ∼10%, after reduction at 650 °C for 7 h. After reduction at 550 °C, the Ni particles were not evident by TEM examination. The results suggest that the formation of a surface NiAl 2 O 4 spinel phase during preparation is beneficial for a high Ni dispersion in the reduced catalyst." @default.
- W2058331375 created "2016-06-24" @default.
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- W2058331375 date "2006-02-01" @default.
- W2058331375 modified "2023-10-17" @default.
- W2058331375 title "Comparison of reducibility and stability of alumina-supported Ni catalysts prepared by impregnation and co-precipitation" @default.
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- W2058331375 doi "https://doi.org/10.1016/j.apcata.2005.11.013" @default.
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