IrFe/ZSM-5 Synergistic Catalyst for Selective Oxidation of Methane to Formic Acid
Yu Xing, Bo Wu, Min Huang, Zhengxing Lu, Jiong Li, Liangshu Zhong, Yuhan Sun
Abstract
Selective conversion of methane to value-added products with high activity and high selectivity to the target products under mild reaction condition remains a great challenge. Herein, bicomponent IrFe supported on ZSM-5 (IrFe/Z-5) was investigated for the selective oxidation of methane. Compared with the 0.7Fe/Z-5 catalyst, the 0.1Ir-0.6Fe/Z-5 exhibited much higher oxygenate yield (3192 vs 971 μmol/g/h). In addition, higher H2O2 utilization efficiency was obtained, and the selectivity toward formic acid was enhanced from 54% to 71.3%. It was found that the activation of the C–H bond was improved by the introduction of Ir single atoms. The superior catalytic performance of 0.1Ir-0.6Fe/Z-5 can be attributed to the synergistic effect between Ir and Fe species with high C–H bond activation capacity and high H2O2 utilization efficiency.