One-pot hydrothermal preparation and catalytic performance of porous strontium ferrite hollow spheres for the combustion of toluene

Strontium ferrite (SFO) hollow spheres with or without porous shells were fabricated via a novel one-pot hydrothermal route with the assistance of glucose and/or ethylenediamine. Physicochemical properties of the materials were characterized by means of a number of analytical techniques, and their catalytic performance was evaluated for the combustion of toluene. It is shown that the SFO samples possessed an orthorhombic structure and displayed a porous hollow spherical morphology with a surface area of 18–27 m2/g. The SFO sample (SFO-3) derived hydrothermally at 170 °C with a glucose/ethylenediamine volumetric ratio of 0.3/1.0 exhibited the highest surface area and oxygen adspecies concentration and the best low-temperature reducibility. Among the SFO samples, the SFO-3 sample showed the best catalytic activity for toluene combustion, and the T10%, T50%, and T90% were ca. 145, 255, and 298 °C at a space velocity of 20,000 mL/(g h), respectively. It is concluded that the good catalytic performance of SFO-3 was associated with its surface oxygen species concentration and better low-temperature reducibility.

Figure optionsDownload high-quality image (109 K)Download as PowerPoint slideHighlights
► Porous SrFeO3 hollow spheres are prepared by the one-pot hydrothermal method.
► Porous SrFeO3 hollow spheres are high in Oads content.
► Porous SrFeO3 hollow spheres are good in low-temperature reducibility.
► Porous SrFeO3 hollow spheres perform well in the combustion of toluene.
► Catalytic activity is governed by the Oads content and low-temperature reducibility.