Catalytic Oxidation of Lean Methane over Ni/MgAl₂O₄ Synthesized by a Novel and Facile Mechanochemical Preparation Method

ABSTRACT

In this artcile, methane catalytic oxidation was studied over the Ni/MgAl₂O₄ catalysts with different weight percentages of nickel oxide synthesized by a simple solid-state mechanochemical preparation method. The Mesoporous nanocrystalline Ni/MgAl₂O₄ catalysts with high specific surface area displayed high catalytic activity in methane catalytic oxidation. The obtained results demonstrated that the increment in Ni loading improved the CH₄ conversion and CO₂ selectivity. The influence of O₂:CH₄ molar ratio and gas hourly space velocity (GHSV) was investigated and the obtained results indicated that the increase in feed ratio and GHSV enhanced the CH₄ conversion. Moreover, the incarease in calcination temperature from 500 to 700°C had a negative influence on the catalytic activity because of the formation of agglomerated particles on the calcined catalysts at higher temperatures.

KEYWORDS:

• Methane catalytic oxidation
• Ni catalyst
• MgAl₂o₄
• mechanochemical preparation method

Acknowledgments

The authors gratefully acknowledge the financial support received from the Iran National Science Foundation (INSF) under the grant number of 97017638.

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.