Structure-Activity Relationships of Pt-WOx/Al2O3 Prepared with Different W Contents and Pretreatment Conditions for Glycerol Conversion to 1,3-Propanediol

Napaphut Dolsiririttigul, Thanapha Numpilai, Chularat Wattanakit, Anusorn Seubsai, Kajornsak Faungnawakij, Chin Kui Cheng, Dai Viet N. Vo, Supinya Nijpanich, Narong Chanlek, Thongthai Witoon

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Turning waste glycerol into a fundamental chemical used in the petrochemical industry offers an opportunity to reduce not only waste from biodiesel production but also the consumption of petroleum-based chemicals. In the present work, glycerol was converted to 1,3-propanediol over Pt-WOx/Al2O3 catalysts, while focusing on the influence of W loading contents (10–20 wt.%) and catalyst pretreatment conditions, specifically the calcination temperatures of WOx/Al2O3 (700–900 °C), calcination temperatures of Pt-WOx/Al2O3 (350–450 °C) and reduction temperatures of Pt-WOx/Al2O3 (300–400 °C). The characteristics of the catalysts were identified by applying N2-sorption, XRD, Raman, CO pulse chemisorption, NH3-TPD, H2-TPR, H2-TPD, SEM and TEM-EDS and XPS. The W loading contents and pretreatment conditions strongly affected the activity and products selectivity. The W content and calcination temperature of WOx/Al2O3 at 15 wt.% and 800 °C, respectively, were evaluated as the most suitable in providing optimum W-O-W clusters to generate Hδ+ which was a key parameter for the generation of 1,3-propanediol. The calcination and reduction temperatures of Pt-WOx/Al2O3 at 400 °C and 350 °C, respectively, were mandatory to sufficiently convert PtCl2 to Pt3O4 and Pt3O4 to metallic Pt, respectively. The optimized Pt-WOx/Al2O3 catalyst achieved a high glycerol conversion (44.7%) with high selectivity toward 1,3-propanediol (45.1%) under a reaction temperature and pressure of 220 °C and 60 bar, respectively.

Original languageBritish English
Pages (from-to)205-222
Number of pages18
JournalTopics in Catalysis
Volume66
Issue number1-4
DOIs
StatePublished - Jan 2023

Keywords

  • 1,3-Propanediol
  • Glycerol conversion
  • Pretreatment conditions
  • Pt-WO/AlO catalyst
  • W loading

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