Abstract: The present application relates to an apparatus for producing magnesium oxide, a method for producing magnesium oxide by using same, magnesium oxide produced thereby, and use of the magnesium oxide. According to the apparatus for producing magnesium oxide, the method for producing magnesium oxide by using same and the magnesium oxide produced thereby of the present application, the magnesium oxide may have high thermal conductivity at low costs, a small spherical particle size, and a dense structure. Such magnesium oxide can be used as a heat-dissipating filler.

Abstract: Provided is a composite catalyst used in a dehydro-aromatization reaction of methane, the composite catalyst including a glasslike metal oxide catalyst which includes a supported catalyst including a porous support and a catalyst of a transition metal oxide supported on the support, and a nickel oxide (NiO) physically dispersed in the supported catalyst.