Acta Chimica Sinica ›› 2025, Vol. 83 ›› Issue (4): 332-340.DOI: 10.6023/A25010018 Previous Articles     Next Articles

Article

复相氧化钛晶相比例对Pt-WOx/TiO2催化剂结构及甘油氢解性能的影响

陈建华, 姜兰, 曾杨, 谢颂海, 裴燕, 乔明华*()   

  1. 复旦大学化学系 多孔材料与分离转化全国重点实验室 上海市分子催化和功能材料重点实验室 上海 200438
  • 投稿日期:2025-01-13 发布日期:2025-03-24
  • 基金资助:
    国家自然科学基金(22272030); 上海市重点实验室专项经费(2024DZSYS02)

Effect of Crystal Phase Ratio of Bi-Phase Titania on Structure and Catalytic Performance of Pt-WOx/TiO2 Catalyst in Glycerol Hydrogenolysis

Jianhua Chen, Lan Jiang, Yang Zeng, Songhai Xie, Yan Pei, Minghua Qiao()   

  1. State Key Laboratory of Porous Materials for Separation and Conversion and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200438, China
  • Received:2025-01-13 Published:2025-03-24
  • Contact: E-mail: mhqiao@fudan.edu.cn; Tel.: 021-31244679
  • Supported by:
    National Natural Science Foundation of China(22272030); Science and Technology Commission of Shanghai Municipality(2024DZSYS02)

Driven by advances in the biodiesel industry, converting glycerol, the major byproduct, into valuable chemicals such as 1,3-propanediol (1,3-PDO) via selective hydrogenolysis has emerged as an important research topic. However, there is a dearth in the study of the effect of the bi-phase support on the catalytic performance of the Pt-WOx-based catalyst in glycerol hydrogenolysis. In this contribution, we synthesized bi-phase TiO2 (bp-TiO2) materials with varying rutile to anatase phase ratios using a coordination-mediated self-assembly method by adjusting the amount of HCl added. These materials were then used as supports for Pt-WOx catalysts to investigate the effect of crystal phase composition of the support on glycerol hydrogenolysis to 1,3-PDO. The Pt-WOx/bp-TiO2 catalysts were systematically characterized by techniques including X-ray diffraction (XRD), Raman spectrometry, N2 physisorption, CO pulsed adsorption, transmission electron microscopy (TEM), pyridine adsorption-Fourier transform infrared spectrometry (Py-IR), temperature-programmed desorption of NH3 (NH3-TPD), and H2 chemisorption, focusing on the phase composition, distribution and dispersion of the Pt and WOx species, acidic property, and ability of hydrogen spillover. The XRD results revealed that with the increase in the HCl dosage, the content of the rutile phase in the support increased first, and then decreased, reaching a maximum of 29%. The TEM and X-ray photoelectron spectroscopy (XPS) results disclosed that the Pt particles and WOx species were inclined to distribute on the rutile phase. The H2 chemisorption results demonstrated that the introduction of the rutile phase greatly enhanced the hydrogen spillover ability of the catalysts. In glycerol hydrogenolysis, it is identified that the glycerol conversion generally improved with the increase in the content of the rutile phase in the support, while the selectivity to 1,3-PDO remained virtually constant at around 60%. Over the Pt-WOx/bp-TiO2(4) catalyst with the highest rutile content of 29%, the yield of 1,3-PDO reached the highest value of 30.3%. This catalyst also displayed good stability. It is plausible that the preferential distribution of the Pt and WOx species on the rutile surface is conducive to the formation of more Pt-WOx interfaces, which greatly enhances hydrogen spillover and thus boosts the yield of 1,3-PDO. This work elucidates the important role of the phase composition of bi-phase TiO2 support on the catalytic performance of the Pt-WOx-based catalyst in glycerol selective hydrogenolysis, which opens up new avenue for the design of high-performance glycerol hydrogenolysis catalysts by means of engineering the phase composition of the support.

Key words: bi-phase TiO2, crystal phase composition, glycerol hydrogenolysis, 1,3-propanediol, hydrogen spillover