Nickel-based catalysts: Dependence of properties on nickel loading and modification with palladium
Mihajlović, Aleksandar M.
Uljarević, Jelena B.
Article (Published version)
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The aim of this study was comparative analysis of catalysts with 5 and 20 wt.% Ni loading, with and without Pd additive, and it included: determination of reduction degrees, investigation on microstructure by scanning electron microscopy and chemical analysis by energy-dispersive spectroscopy. Ni/Al2O3 and Ni-Pd/Al2O3 catalysts supported on alpha-Al2O3-based foams were synthesized by aerosol assisted impregnation. Impregnation of the foams by ultrasonically aerosolized chlorides was followed by drying at 473 K and hydrogen reduction at 533 and 633 K. Lower Ni loading resulted in higher reduction degrees. Ni loading of 20 wt.% enabled relatively uniform coverage of the foam with a metallic coating. Nearly complete reduction was achieved at both temperatures with activity modifier (Pd). Reduction degrees reached 99.4 and 98.2 wt.% at 533 K for 5 and 20 wt.% of Ni, respectively.
Keywords:catalysts / Ni / Pd / modification / alpha-Al2O3-based foam / aerosol assisted impregnation
Source:Hemijska industrija, 2016, 70, 2, 137-142
- Assoc Chemical Engineers Serbia, Belgrade