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Transformation of alumina supported nickel catalysts during hydrodechlorination of 1,2-dichloroethane

100%
Juszczyk W., Karpiński Z.
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
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2011
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vol. 66
4-11
EN
Our previous work with Sibunit carbon supported nickel catalysts investigated in the reaction of 1,2-dichloroethane hydrodechlorination showed the transformation of nickel to an fcc NiCx solution and/or even to an hcp Ni3C carbide phase during reaction. Carbon entering to nickel was considered to originate from the organic molecule, not from the carbon support. To substantiate this interpretation we decided to carry out the title reaction in the presence of alumina supported nickel catalysts. Hydrodechlorination of 1,2-dichloroethane performed on differently metal loaded Ni/Al2O3 catalysts resulted in a massive carbiding of nickel, leading to the Ni3C carbide phase. This effect was better marked for the catalysts with a higher Ni loading (≥2 wt.%). However, for very high Ni loading (20 wt.%) characterized by bigger metal crystallites (~30 nm), only a portion of Ni was carbided.
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Effect of Uniaxial Pressure on the Ferroelectric Phase Transition in Pb_5Ge_3O_{11}:Ba Crystals

81%
Molak A., Koralewski M., Saunders G., Juszczyk W.
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2005
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vol. 108
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issue 3
513-520
EN
The effect of uniaxial pressure up to 1 kbar applied perpendicular and parallel to c-axis, on the Curie temperature and electric permittivityε_c of Ba-doped Pb_5Ge_3O_{11} single crystals was investigated. The Curie temperature decreases with uniaxial pressure and the coefficientγ_i (γ_i ≡ δ T_{c}/δ X_i) is determined as -7 and -11 K kbar^{-1} for the b- and c-axes, respectively. It was found that uniaxial pressure increases the phase transition diffuseness and the tricritical point cannot be achieved for this pyroelectric and ferroelectric single crystal.
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