Manufacturing an‎d eva‎luation of magnesium spinel aluminate nano powder an‎d its application in methane dry reforming

10/23/2025 12:00:00 AM

Dry reforming of methane, as a route for the simultaneous conversion of CH₄ an‎d CO₂ to syngas, has industrial an‎d environmental significance; nevertheless, catalyst stability an‎d carbon deposition remain major challenges in this process. This study has been conducted to enhance the activity an‎d stability of the MgAl₂O₄ spinel support an‎d to reduce coking. Given its suitable intrinsic activity in DRM, lower cost compared with noble metals, an‎d industrial availability, nickel oxide was selec‎ted as the active phase. In the first step, various nickel oxide loadings were eva‎luated in terms of activity an‎d stability, an‎d a loading of 12.5 wt.% was determined as the optimum. Subsequently, to improve performance, barium oxide was added to the catalyst. TPR results have shown a shift of reduction peaks to lower temperatures, an‎d TPO data have confirmed a marked decrease in coke formation compared with the sample without barium oxide. Reactor tests were carried out over the temperature range of 550–700 °C, an‎d at 700 °C under the test conditions, the methane conversion was about 78% an‎d the carbon dioxide conversion was about 79%. In a 10-hour stability test, the activity dro‎p was 3% for the barium-free sample an‎d 1% for the Ba-promoted sample. Examination of calcination temperature in the 550–650 °C range has shown that the specific surface area decreases by approximately 30% an‎d the metal–support adhesion has improved. In summary, the results indicate that adding 3 wt.% barium an‎d selec‎ting an appropriate calcination temperature (650 °C) have jointly improved activity, stability, an‎d resistance to coke formation in the Ni/MgAl₂O₄ catalyst.

ريفرمينگ خشك متان , گاز سنتز , اكسيد نيكل , اسپينل MgAl₂O₄ , اكسيد باريوم

Dry reforming of methane , Syngas , ، Nickel oxide (NiO) , Magnesium aluminate spinel (MgAl₂O₄) , Barium oxide (BaO)

mohammadali chaji

Dr.mehran rezaei