تآثير اضافة آوكسيد السيريوم الثلاثي على قاعدية آوكسيد المغنيسيوم/نيكل وكذلك على فعاليته كعامل مساعد في تفاعل ثاني آوكسيد الكاربون مع الميثان. (تحويل غاز ثاني اوكسيد الكاربون الى وقود)

الملخص

The only way to stabilize the Earth’s climate is to stabilize the concentration of greenhouse
gases in the atmosphere. In this study, the conversion of methane and CO2 to synthesis gas
using dry reforming over catalysts Ni/Mg1-XCeXO (x= 0, 0.03, 0.07, 0.15; 1 wt% Ni each),
dry reforming of methane was performed. The catalysts were prepared by K2CO3 coprecipitation
from aqueous cerium nitrate hexahydrate and magnesium nitrate hexahydrate.
Impregnation of nickel (II) acetylacetonate onto MgO-Ce2O3 was then conducted. TEM,
XRD, FTIR, XRF, XPS, and BET characterizations of the catalysts were carried out.
Results showed that the catalysts were reduced at 700 °C by H2 prior to each reaction. CH4
and CO2 conversions at 900 °C of the catalysts after being tested for 200h decreased in the
order Ni/Mg0.85Ce0.15O, Ni/Mg0.93Ce0.07O, Ni/Mg0.97Ce0.03O, and Ni/MgO. The highest H2
and CO selectivities, was observed at a 1:1 CH4:CO2 mole ratio. We further performed a
dry reforming in the presence of low-concentration oxygen flow (1.25 Vol %) and found an
increased CH4 conversion.