Efficient Synthesis of Monomeric Fe Species in Zeolite ZSM‐5 for the Low‐Temperature Oxidation of Methane
Tao Yu, Yang Su, Aiqin Wang, Bert M. Weckhuysen, Wenhao Luo
Abstract
Abstract Direct oxidation of methane into value‐added C1 oxygenated products, such as methanol, is essential and remains a significant challenge in the field of catalysis. In this work, we have prepared Fe/ZSM‐5 materials via three different methods and investigated the influence of various preparation methods on the composition and catalytic performance of Fe/ZSM‐5 for the low‐temperature oxidation of methane. Through a combination of scanning transmission electron microscopy, ultraviolet‐visible diffuse reflectance and 57 Fe Mössbauer spectroscopy, we have found that the highest proportion of monomeric Fe species of 71 % could be achieved in the ZSM‐5 zeolite by the solid‐state ion‐exchange method, affording an excellent C1 oxygenates yield of 120 mol/mol Fe with a C1 oxygenates selectivity of 96 % at 50 °C for 30 min in the aqueous solution of H 2 O 2 .