Influence of SnO_2-doped W-Mn/SiO_2 for oxidative conversion of methane to high hydrocarbons at elevated pressure

摘要

The SnO_2-doped 5% Na_2WO_4-2% Mn_2O_3/SiO_2 catalyst for oxidative conversion of methane to high hydrocarbons has been studied in a micro-stainless-steel reactor at leevated pressure; here the C_2, C_3 and C_4 hydrocarbons selectivities of 36.8, 14.2 and 22.1% are observed. On addition of SnO_2, conversion of methane and selectivities of C_3-C_4 hydrocarbons increase obviously. The observed results show the storage-oxygen capability in Na-W-Mn/SiO_2 catalyst is enhanced with adding SnO_2, for Mn and Na_2WO_4 migrate to near-surface to result in a marked shift to higher molecular weight products. The distribution of products at the operating conditions and content of SnO_2 loading has been described.