One-Step Hydrothermal/Solvothermal Preparation of Pt/TiO2: An Efficient Catalyst for Biobutanol Oxidation at Room Temperature

• Published in: Molecules (Basel, Switzerland) Switzerland), 2024-04, Vol.29 (7), p.1450
• Main Authors: Lei, Lijun, Cao, Qianyue, Ma, Jiachen, Hou, Fengxiao
• Format: Article
• Language: English
• Subjects: Acids; Alcohol; Alternative energy; Ammonia; Aqueous solutions; biobutanol; Biomass energy; Carbon; Catalytic oxidation; Ethanol; Fossil fuels; hydrothermal/solvothermal; Ligands; Methods; Nanocrystals; Nanoparticles; Outdoor air quality; Particle size; Pt-TiO2; Raw materials; size effect; Solvents; Temperature
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules29071450

The selective oxidation of biobutanol to prepare butyric acid is an important conversion process, but the preparation of low-temperature and efficient catalysts for butanol oxidation is currently a bottleneck problem. In this work, we prepared Pt-TiO2 catalysts with different Pt particle sizes using a simple one-step hydrothermal/solvothermal method. Transmission electron microscopy and X-ray diffraction results showed that the average size of the Pt particles ranged from 1.1 nm to 8.7 nm. Among them, Pt-TiO2 with an average particle size of 3.6 nm exhibited the best catalytic performance for biobutanol. It was capable of almost completely converting butanol, even at room temperature (30 °C), with a 98.9% biobutanol conversion, 98.4% butyric acid selectivity, and a turnover frequency (TOF) of 36 h−1. Increasing the reaction temperature to 80 and 90 °C, the corresponding TOFs increased rapidly to 355 and 619 h−1. The relationship between the electronic structure of Pt and its oxidative performance suggests that the synergistic effect of the dual sites, Pt0 and Pt2+, could be the primary factor contributing to its elevated reactivity.