The MoO3 Nano-Belt Supported Iron Molybdate Catalyst Prepared by Deposition-Precipitation Method
1. State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China；
2. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
Abstract：In order to adjust the size of Fe2(MoO4)3 particles supported on the MoO3 and to enhance the intimate contact between them, ferrous composition was precipitated and deposited on the MoO3 nano-belt which was synthesized in the hydrothermal system, and then calcined to ferric molydbate. The prepared catalysts were characterized by inductive coupled plasma-atomic emission spectrometry (ICP-AES), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), N2 physical adsorption and scanning electron microscope (SEM), and were evaluated for the selective oxidation of methanol to formaldehyde. It was showed that the catalyst prepared by deposition-precipitation method (DP) consisted of Fe2(MoO4)3 and MoO3, the islands of fine particles which is Fe2(MoO4)3 were densely distributed on the surface of the MoO3 nano-belt, different from the impregnation method (IM) which will lead to the agglomerate Fe2(MoO4)3. The DP catalyst gave the significantly superior activity and the better selectivity. Moreover, the pH value to the end of the precipitation affected the catalyst remarkably, with higher pH value, the Fe2(MoO4)3 increased and offered more reactivity, yet the by-product of CO may also be promoted. The modest pH value was 2.5-3.0, which optimized the selectivity to formaldehyde. As a conclusion, it will be beneficial to the Mo-Fe catalyst to reduce the size of Fe2(MoO4)3 and meanwhile intimately adhere them to MoO3.
WANG Chao1,ZHANG Heng2,LI Ping2 et al. The MoO3 Nano-Belt Supported Iron Molybdate Catalyst Prepared by Deposition-Precipitation Method[J]. 化学反应工程与工艺, 2019, 35(4): 296-305.
