Unveiling structure–property relationships of Fe-promoted Rh-Mn/UiO-66-drived catalysts for C2 oxygenates formation from syngas

• Published in: Fuel (Guildford) Vol. 319; p. 123737
• Main Authors: Chen, Guoqing, Xue, Xiaoya, Guo, Qiangsheng, Mao, Dongsen, Yu, Jun
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.07.2022; Elsevier BV
• Subjects: C2 oxygenates; Carbon monoxide; Catalysts; Catalytic activity; Catalytic converters; Conversion; Fe promoter; Fourier transforms; Infrared spectra; Iron; Manganese; Photoelectrons; Rh-Mn/UiO-66-drived; Rhodium; Selectivity; Surface reactions; Syngas conversion; Synthesis gas; Transmission electron microscopy; X ray photoelectron spectroscopy; X-ray diffraction; Fe promoter; C2 oxygenates; Rh-Mn/UiO-66-drived; Syngas conversion
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2022.123737

The effect of iron promoter on the catalytic properties of Rh-Mn/UiO-66-drived catalyst was investigated by syngas conversion. The appropriate addition of Fe can enhance the Rh-Fe interaction, resulting in the enhancement of CO dissociation ability and strength of the Rh-CO bond, which should be responsible for the higher CO conversion and selectivity of C2+ oxygenates. [Display omitted] •Fe-promoted Rh-Mn/UiO-66-drived catalysts were investigated by syngas conversion.•The Rh-Fe interaction can promote the reduction of Rh active sites.•The Rh0-rich state can enhance CO dissociation ability and Rh-CO bond strength. The effect of iron promoter on the catalytic performance of Rh-Mn/UiO-66-drived catalyst was studied by syngas conversion. The catalysts were completely characterized by means of X-ray diffraction (XRD), N2 sorption, transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS), diffuse reflectance infrared Fourier transform spectra (DRIFTS), and temperature-programmed surface reaction (TPSR). When the amount of Fe doping reached 0.3 wt%, the catalyst has the excellent catalytic activity with the highest C2+ oxygenates yield of 300.1 g/(kg·h). The results indicated that the appropriate addition of iron can enhance the Rh-Fe interaction, which promote the reduction of Rh active sites. The Rh0-rich state would be observed on the catalysts doped by the appropriate amount of Fe, resulting in the enhancement of CO dissociation ability and strength of the Rh-CO bond, which should be responsible for the higher conversion rate and selectivity of C2+ oxygenates.