Study of PtOx/TiO2 photocatalysts in the photocatalytic reforming of glycerol: The role of co-catalyst formation

Katalin Majrik, Z. Pászti, L. Korecz, László Trif, Attila Domján, Giuseppe Bonura, Catia Cannilla, Francesco Frusteri, A. Tompos, Emília Tálas

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Abstract

In this study, relationships between preparation conditions, structure, and activity of Pt-containing TiO2 photocatalysts in photoinduced reforming of glycerol for H2 production were explored. Commercial Aerolyst® TiO2 (P25) and homemade TiO2 prepared by precipitation-aging methodwere used as semiconductors. Pt co-catalystswere prepared by incipientwetness impregnation from aqueous solution of Pt(NH3)4(NO3)2 and activated by calcination, high temperature hydrogen, or nitrogen treatments. The chemico-physical and structural properties were evaluated by XRD, 1H MAS NMR, ESR, XPS, TG-MS and TEM. The highest H2 evolution rate was observed over P25 based samples and the H2 treatment resulted in more active samples than the other co-catalyst formation methods. In all calcined samples, reduction of Pt occurred during the photocatalytic reaction. Platinum was more easily reducible in all of the P25 supported samples compared to those obtained from the more water-retentive homemade TiO2. This result was related to the negative effect of the adsorbed water content of the homemade TiO2 on Pt reduction and on particle growth during co-catalyst formation.

Original languageEnglish
Article number1927
JournalMaterials
Volume11
Issue number10
DOIs
Publication statusPublished - Oct 10 2018

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Keywords

  • Calcination
  • Co-catalyst
  • Glycerol
  • H evolution
  • High temperature H treatment
  • High temperature N treatment
  • Pt(NH)(NO)
  • TiO

ASJC Scopus subject areas

  • Materials Science(all)

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