Catalyst selection for the catalytic dehydroaromation reaction of methane
Аннотация
In this article, the promoting properties of transition metals on a molybdenum-containing catalyst in the catalytic dehydroaromatization of methane were studied. The conversion of methane (99.9% purity) without oxidants was carried out in a flow reactor with a fixed-bed catalyst at 600-800 ℃ and atmospheric pressure, with a volumetric rate of methane of 100-1000 h-1 and CH4:Ar=1:1. In a quartz reactor, the volume of the catalyst is 1.0 cm3, and the size of its particles is 0.5-1.0 mm. The speed of the aromatization reaction of methane without oxidizing participation, the yield and selectivity of aromatic hydrocarbons, and the conversion of starting materials were studied, and the following optimum reaction conditions were selected as a result: T=750°, volumetric rate hour-1; the height of the catalyst layer was 10 cm. The highest activity of the catalyst in the methane dehydroaromatization reaction was shown when its volumetric rate was 1000 h-1. Methane conversion under these states extends 52.5%, and catalyst activity does not change for 260 minutes. Increasing the flow rate of methane from 1000 to 1500 h-1 led to a decrease in its conversion and the duration of stable operation of the catalyst.