Preparation and Properties of MoO3−TiO2−SiO2 Composites with Spherical Shape of Agglomerates

Synthesis of nanostructured composite materials of MoO3/TiO2-SiO2 with spherical shape prepared with resins

“…The preparation of composites based on MoO 3 /TiO 2 -SiO 2 with spherical shape of agglomerates was done according to the procedure, which was proposed in our previous works [5,7]. In the first step, TOKEM-320Y and TOKEM-400 anion-exchange resins preliminarily loaded with Mo 7 O 6− 24 ions were prepared.…”

“…Hollow spheres of metal oxides are intensively investigated for applications, such as controlled release capsules for drugs, fillers, filters [1], gas sensitive materials [1,2], absorbents and separation materials, especially for fixed-bed reactors or chromatography columns [3]. In recent years, hollow spheres of metal oxides have also been intensively investigated for applications as catalysts [3][4][5][6][7]. This is because metal oxide with hollow micro and nanospheres only has low density and good porous structure (usually contain both mesopores and macropores [3]), but also provides a high surface area with more active acid-base oxide centers on the pore surface [4].…”

“…Many approaches to the preparation of oxide materials with spherical form of agglomerates have been proposed to date, such as emulsion approaches [8], spray pyrolysis techniques [2], and templating synthesis [1]. Among these numerous techniques of hollow spheres production, thermal decomposition of ion-exchange resins loaded with the metal ions is the most attractive one due to its simplicity, ease for scale-up (in industry), and high quality resulting materials [1,4,5]. In addition, templates and precursors are all commercially available and inexpensive.…”

“…This method was used for the first time for preparing plutonium oxide microspheres as early as 1989 [9]. Later it was successfully applied to obtain spherical particles of Fe 2 O 3 [3,10], porous Al 2 O 3 , TiO 2 [3] and ZrO 2 /Al 2 O 3 macrobeads [4], MoO 3 microspheres [1] and TiO 2 -SiO 2 /M x O y (M = Co, Cr) [6] and MoO 3 -TiO 2 -SiO 2 composites [5]. Resins with various compositions and structures were used in these studies.…”

“…We believe that the formation of strong spherical agglomerates is primarily influenced by the mechanism of thermal destruction of the ion-exchange resin. In a previous study [5], we demonstrated a route to prepare spherical particles of MoO 3 -TiO 2 -SiO 2 composites using TOKEM-400 and TOKEM-840 anion-exchange resins of the gel structure. It was established that the resin type influenced the surface morphology of the composites.…”