A composite photocatalyst, comprising V.sub.2C@V.sub.2O.sub.5/TiO.sub.2, is disclosed herein. Additionally, a process for producing this composite, particularly V.sub.2C@V.sub.2O.sub.5/TiO.sub.2, involves the steps of preparing V.sub.2C@V.sub.2O.sub.5/TiO.sub.2 composite; grinding the V.sub.2C@V.sub.2O.sub.5/TiO.sub.2 composite; and calcining the ground product to obtain the composite photocatalyst V.sub.2C@V.sub.2O.sub.5/TiO.sub.2. Furthermore, the disclosure encompasses utilizing the composite photocatalyst in a CO.sub.2 reduction process, wherein the photocatalyst is irradiated in a photoreactor system.

The claimed solution relates to catalysts for the hydrocarbons dehydrogenation, and particularly relates to a novel catalyst having a structure that makes it possible to provide high olefin selectivity and a high yield of olefins in a dehydrogenation process. The aim of the present solution is to develop a catalyst structure that provides greater selectivity and a higher yield of olefins in hydrocarbons dehydrogenation processes. The effect of the present solution includes providing high catalytic activity and selectivity in hydrocarbons dehydrogenation processes, and expanding the range of products applicable in hydrocarbons dehydrogenation processes.