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Nickel Content (nickel + content)

Distribution by Scientific Domains

Physics and Astronomy	50%

Selected Abstracts

Light FCC gasoline olefin oligomerization over a magnetic NiSo4/,-Al2o3 catalyst in a magnetically stabilized bed

AICHE JOURNAL, Issue 3 2009
Ying Peng
Abstract Magnetic NiSO4/,-Al2O3 catalysts were prepared by impregnating NiSO4 solutions onto the ,-Al2O3 support containing a magnetic material of Fe3O4. Characterization by XRD, NH3 -TPD, and thermal analysis showed that the magnetic NiSO4/,-Al2O3 catalyst with a nickel content of 7.0% by weight had a monolayer dispersion of NiSO4 and the largest number of moderate strength acid sites, and a high specific saturation magnetization. The magnetic catalyst was evaluated for light FCC gasoline olefin oligomerization in both fixed-bed and magnetically stabilized bed (MSB) reactors. Comparing with that in the fixed-bed reactor, the optimal reaction temperature in the MSB lowered to 443 K, and its space velocity ranged broadly from 2.0 to 6.0 h,1. The sulfur-free diesel distillate produced by operation of the MSB for 100 h had higher cetane number and good low-temperature flow property, which illuminates a promising application of the MSB to manufacture clean diesel fuels with high productivity and flexibility. © 2009 American Institute of Chemical Engineers AIChE J, 2009 [source]

The metallographic cooling rate method revised: Application to iron meteorites and mesosiderites

METEORITICS & PLANETARY SCIENCE, Issue 1 2001
W. D. HOPFE
This revision incorporates a better fit to the ,/, + , phase boundary and to the ,/, + , phase boundary particularly below the monotectoid temperature of 400 °C. A reevaluation of the latest diffusivities for the Fe-Ni system as a function of Ni and P content and temperature is made, particularly for kamacite diffusivity below the paramagnetic to ferromagnetic transition. The revised simulation model is applied to several iron meteorites and several mesosiderites. For the mesosiderites we obtain a cooling rate of 0.2 °C/Ma, about 10x higher than the most recent measured cooling rates. The cooling rate curves from the current model do not accurately predict the central nickel content of taenite halfwidths smaller than ,10 ,m. This result calls into question the use of conventional kamacite growth models to explain the microstructure of the mesosiderites. Kamacite regions in mesosiderites may have formed by the same process as decomposed duplex plessite in iron meteorites. [source]

Effect of palladium addition on the electrochemical properties of amorphous 2Mg + 3d alloys doped by nickel atoms (3d = Fe, Ni)

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 5 2010
Maciej Jarzebski
Abstract Amorphous 2Mg+ 3d/x wt% Ni materials were prepared by mechanical alloying (MA) of Mg and 3d elemental powders (3d = Fe, Ni x =0, 100 and 200 wt.%) under high purity argon atmosphere in SPEX 8000 Mixer Mill. The effect of the Ni addition on the electrochemical properties of the synthesized nanostructured alloys was investigated in details. The discharge capacity of amorphous 2Mg+Fe (Ni) high energy ball milled with Ni was improved. With increasing nickel content in the studied 2Mg+Fe (Ni) materials, at first cycle, the discharge capacity increases first and then decreases, and for example, for x = 100 in 2Mg+Fe reaches a maximum value of 155 mAh g,1. Additionally, when coated with palladium, the discharge capacity of an amorphous 2Mg+Fe (Ni) powders was increased as well. The catalytic elements (Ni, Pd) were distributed on the surface of ball milled alloy particles homogenously and role of these particles is to catalyze the dissociation of molecular hydrogen on the surface of studied alloy. Mechanical coating with palladium effectively reduced the degradation rate of the studied electrode materials. Compared to that of the uncoated powders, the degradation of the coated was suppressed. The amorphous Mg-based hydrides offer a breakthrough in prospects for practical applications (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Development of Diamond Machinable Films by Reactive Magnetron Sputtering

PLASMA PROCESSES AND POLYMERS, Issue S1 2007
Christian Schulz
Abstract Thin Ni-doped titanium nitride (Ti-Ni-N) films were deposited on X42Cr13 steel samples by reactive magnetron sputtering. By varying the nitrogen gas flow and target composition, films with different nickel and nitrogen contents were grown with a plastic universal hardness between 7.2 and 17.2 GPa. SEM analysis revealed amorphous, fine crystalline and columnar structure depending on the chemical composition. Furthermore, a contact test was carried out to investigate the reactivity between the film surface and single crystalline diamond. Analysis of the films and the diamond by SEM and EDX showed especially that films with an average nitrogen and nickel content did not react with diamond. [source]