Preparation of a fiberglass‐supported Ni‐Si‐Ti oxide catalyst for oxidation of hydrocarbons: effect of SiO₂

Abstract

BACKGROUND: Preparation of homogeneous oxide coatings on the surface of fiberglass is a difficult task due to hydrophobicity of the fiberglass support. NiO-TiO 2 cannot coat the fiberglass surface homogeneously. In the present study, SiO 2 was added in the NiO-TiO 2 . A sol-gel method was used to prepare Ni-Si-Ti sol and this was used to coat fiberglass and form a complex Ni-Si-Ti oxide system supported on its surface. The catalyst was tested for hydrocarbon oxidation reaction. RESULTS: The as-prepared material is a mixture of TiO 2 in the anatase modification and SiO 2 in the amorphous phase. UV-visible diffusion reflectance spectroscopy confirmed the presence of Ni 2+Oh cations in the film bulk. Introduction of silica to the sample ensured a uniform distribution of the Ni-Ti oxide system on the fiberglass surface and its durable retention there at 600 ∘ C. The Ni-Si-Ti mixed oxide supported on fiberglass demonstrated a higher catalytic activity in the oxidation of n-heptane, compared to Ni-Ti oxide/fiberglass catalyst. It is stable even at 600 ∘ C, the temperature at which the maximum n-heptane conversion of 93% was reached. CONCLUSION: Adding SiO 2 in NiO-TiO 2 can coat fiberglass homogeneously as SiO 2 can coat hydrophobic surfaces such as fiberglass. This research provides a method with which to coat metal oxide catalyst on fiberglass that is very active and stable for oxidation of hydrocarbons even at high temparatures, compared to that without adding SiO 2 .

Improving Mechanical Properties of Glass Fiber Reinforced Polymers through Silica-Based Surface Nanoengineering

“…Surprisingly, advanced approaches to produce nanostructured silica coatings have been seldom adopted on top of GFs for enhancing the mechanical properties of GFRPCs. , For instance, silica nanoparticles have been grown on top of different substrates, achieving control over the coverage and final porosity. , Nonetheless, silica interfaces on GFRP are generally created by attaching silica nanoparticles to GFs through molecular ligands. , In this regard, there is a wide number of smart strategies addressing this concept for several applications. , Thin film mesoporous silica have been also produced on top of different substrates with an extraordinary level of control over channel size, showing great potential as membranes for sensing and molecular separation. − However, to the best of our knowledge, such structures have never been grown on top of GFs nor used as an interface in GFRPs. Besides, while silica gels and aerogels have been reinforced with GFs to improve their mechanical stability, , such interconnected porous networks have been barely used as a GF–polymer interface in GFRPs …”

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

“…In the second stap, the dried resins loaded with Mo 7 O 6− 24 ions were placed in the sol based on tetrabutoxytitanium (TBT, Acros, USA) and tetraethoxysilane (TEOS, Ecos-1, Russia). The aggregatively stable sol was prepared in accordance with a procedure proposed earlier by Shamsutdinova et al [24,25]. The mixture of TBT and TEOS was dissolved in a solution consisting of C 4 H 9 OH (Ecos-1, Russia), H 2 O and HNO 3 .…”