Сравнительное исследование фазового состава и активности катализаторов для окислительной конденсации метана: моно- и биметаллические модельные образцы

Abstract

Oxidative coupling of methane (OCM) is one of the perspective catalytic processes for the production of ethylene from natural and associated petroleum gas. In this work the comparative study of phase composition and activity of OCM catalysts using mono- and bimetallic model samples of Na-Mn-W-(La)/SiO2, as one of the standard catalysts, was conducted. X-ray diffraction (XRD) has revealed the peculiarities of crystal structures in the model catalysts Na(Mn,W,La)/SiO2, Na-Mn(W,La)/SiO2 and Mn-W(La)/SiO2. Catalyst activity measurements have demonstrated that methane conversion, C2 hydrocarbon product selectivity and yield are related with model catalyst composition and OCM reaction temperature. The obtained results show that the presence of Na is very beneficial for the structure formation and activity of standard and model catalysts, while each of the two other key metals, Mn and W (as well as added La), give their own contributions.