Pt-Fe bimetallic catalyst catalyzed the selective hydrolysis of furfural to produce 1, 2-pentanediol under mild conditions

   1, 2-pentanediol is an important fine chemical, widely used in fungicides, disinfectants and cosmetics, furfural is important
The preparation of 1, 2-pentanediol by selective hydrogenolysis of furfural is sustainable, environmentally friendly and achieved in a one-pot process
The path. In order to obtain a higher yield of 1, 2-pentanediol, the current literature usually uses a higher load of precious metals and phases
For higher hydrogen pressures, this requires additional energy input. In order to improve the atomic utilization of precious metals and can be more mild
The second metal Fe was introduced to modify the electronic and geometric properties of Pt, which improved the activity of the reaction
Sex and selectivity.
1. Synthesis and characterization of catalyst
In this work, Pt-Fe/MT(MT is MgTiO3) catalyst is prepared by impregnation method. Electron microscopy showed that for 0.8Pt/MT and 0.8Pt0.4Fe/MT catalysts, Pt was uniformly distributed on the carrier with a particle size of 1-2nm, and the introduction of Fe did not lead to particle growth. The linear scanning and mapping of 0.8Pt0.4Fe/MT catalysts showed that Fe was in direct contact with Pt. Instead of being dispersed on the carrier alone. The results of CO chemisorption showed that with the increase of Fe content, the adsorption amount of CO gradually decreased, which may be caused by the electronic modification of Fe to Pt, or the surface of Pt may be partially wrapped by Fe.
2. The electronic properties of Pt-Fe are characterized by CO-DRIFTS and XPS. In the co-Drifts characterization of 0.8Pt/MT, 0.8Pt0.4Fe/MT and 0.8Pt0.8Fe/MT catalysts, CO adsorption on 0.8Pt/MT is classified as linear adsorption in the 2000-2100cm-1 region. The adsorption in the 1700-1900cm-1 region is classified as bridge adsorption. Linear adsorption peaks can be further fitted to 3 peaks:
2084cm-1, 2061cm-1 and 2023cm-1 were attributed to the adsorption of CO at Pt sites with different coordination numbers, respectively. Compared with 0.8Pt/MT catalyst, 0.8Pt0.4Fe/MT catalyst showed similar characteristics, but the CO vibration peak was redshifted and the intensity was reduced. The redshift indicated that the electron density of Pt site increased, which was caused by Fe electron supply. The trend becomes more obvious with the increase of Fe content. Quasi-in-situ XPS showed that the binding energy of Pt 4f7/2 in 0.8Pt/MT catalyst was 71.4eV, mainly in metallic state, while the binding energy of Pt 4f7/2 in 0.8Pt0.4Fe/MT catalyst was 71.2eV, which further confirmed the electron transfer from Fe to Pt. Fe exists mainly in the form of Fe<+.