Green-Chemical Synthesis of ETS-4 Zeotypes for Photocatalytic Hydrogen Production

Abstract

Pristine ETS-4, a microporous titanosilicate zeotype material was successfully synthesized by using inorganic alkaline-sols as precursors for the first time. Use of halogen/organic free medium, drastic reduction in excess amount of alkali precursors and short synthesis time makes this methodology much more versatile. Sr-ETS-4 material was prepared using ion-exchange process. Structural, optical, bulk and surface properties of the synthesized materials were thoroughly examined and their properties are interpreted. The photocatalytic experiments were conducted under UV light irradiation. Further, Sr-ETS-4 material has showed ca. 4 times higher photocatalytic efficiency for photocatalytic methanol reforming as compared with pristine ETS-4 catalyst. The observed higher photocatalytic efficiency of Sr-ETS-4 catalyst might be attributed to better electron transfer properties of Sr-ion and semiconducting property of one-dimensional titanium chains within zeotype structure.

Hydrochloric Acidic Processing of Titanite Ore to Produce a Synthetic Analogue of Korobitsynite

“…The further steps in this direction will include reinforcing the SKR photocatalytic activity by means of Na substitution onto Au, Ag, Pt, Co, Mn and other noble and transition metals [12][13][14]. It must be noted also that Sr-substituted ETS-4 showed ca.4 times better photocatalytic hydrogen production then ETS-4 itself [27], thus we can expect analogue effect in Sr-substituted SKR.…”