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Carbon dioxide reforming of methane over Ni–In/SiO2 catalyst without coke formation
Johanna Károlyi,Miklós Németh,Claudio Evangelisti,György Sáfrán,Zoltán Schay,Anita Horváth,Ferenc Somodi 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.58 No.-
It was found that coke formation on Ni/SiO2, used in dry reforming of methane, can be eliminatedcompletely by addition of indium to the catalyst. The interaction of the two metals was suggested by theresults of TPR, CO-TPD and XPS measurements. The presence and uniform distribution of NiIn and Ni2Inalloy nanoparticles after reduction at 700 C of the calcined catalyst was shown by HAADF-STEM, HRTEMand EDX analysis. The indium atoms dilute the nickel surface inhibiting the formation of multiplebondedcarbon species thereby hindering the development of carbon nanostructures on the catalystsurface during dry reforming.
Hydrodynamic characteristics of activated carbon in air- and water-fluidized beds
Aurél Ujhidy,György Bucsky,Jenö Németh 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.5
The hydrodynamic characteristics of small hydrophobic activated carbon particles were determined in air flowing through both fixed and fluidized bed layers and water flowing through an inverse fluidized bed. Based on experimental data the Ergun-equation was corrected. A new relationship is proposed to predict the pressure drop in a fixed bed with gas flowing by using the minimum fluidizing velocity (umf) and particle terminal velocity (ut). Apparent density of oven-dried activated carbon increases with filling the internal pores by water. After the bed density reaches the density of water, the system switches from an inverse fluidized layer into the classical fluidized state. Finally, it has been demonstrated that the Reynolds number (Remf) at umf associated with the original Archimedes number (Ar) for gas-solid fluidized system and the modified Ar numbers characterizing the inverse fluidized beds lie on identical curves.