Study of PtOx/TiO2 Photocatalysts in the Photocatalytic Reforming of Glycerol: The Role of Co-Catalyst Formation

Materials

László Trif¹  Katalin Majrik¹  Zoltán Pászti¹  Emília Tálas¹  András Tompos¹  László Korecz¹  Attila Domján²  Francesco Frusteri³  Giuseppe Bonura³  Catia Cannilla³ 

[1] Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary;NMR Research Group, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary;National Council of Research—CNR-ITAE, “Nicola Giordano”, Via S. Lucia 5, 98126 Messina, Italy;

关键词: TiO2;    co-catalyst;    Pt(NH3)4(NO3)2;    high temperature H2 treatment;    high temperature N2 treatment;    calcination;    glycerol;    H2 evolution;   

DOI  :  10.3390/ma11101927

来源: DOAJ

【 摘 要 】

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 method were used as semiconductors. Pt co-catalysts were prepared by incipient wetness 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.

【 授权许可】

Unknown