Photocatalytic Hydrogenation of CO2 over PtTiO2-Based Photocatalyst
Nishat Khan, Seema Garg, Andras Sapi
Department of Applied and Environmental Chemistry, University of Szeged, Szeged, Hungary
Department of Chemistry, Amity Institute of Applied Sciences, Amity University, Sector-125, Noida 201313, Uttar Pradesh, India
Catalytic conversions of carbon dioxide (CO2) into carbon monoxide as well as other hydrocarbons through hydrogenation of carbon dioxide, which originates directly from energy sources that are renewable, are regarded as one of the most cost-effective strategies to mitigate global warming and force chemical and energy businesses toward more sustainable resource usage. The CO2 hydrogenation process has recently examined a wide range of heterogeneous catalysts. Due to its outstanding material qualities in several domains, including energy and the environment, TiO2 has received significant interest as a potential photocatalytic material for decades however, its broad bandgap (3-3.2 eV) inhibits light absorption in confined light wavelength ranges, and TiO2 relatively high charge carrier recombination rate is a barrier to efficient photocatalytic CO2 conversion. Similar to how nanostructures have benefits like enhanced light absorption, increased surface area, directed charge transport, and effective charge separation. In addition, methods including hydrogenation, junction creation, and doping have improved photocatalytic performance. Those tactics have the potential to significantly alter the electrical architecture behind the improved spectrum harvesting. Methanol, CO, ethanol, and many more derivatives are produced directly from the hydrogenation of CO2 by examining the catalytic efficiency and reaction mechanism over a variety of heterogeneous catalyst types with a focus on practical considerations. Using TiO2 as the support, Pt NP is able to promote the overall CO2 conversion to enhance the activity of Pt over PtTiO2 is originated from the sites at the Pt-oxide interface, where the synergy between Pt and oxide plays an important role. In this review, we highlight the work done to improve photocatalytic CO2 reduction via both the material and structural modification of TiO2 and TiO2-based photocatalytic systems. Also, we go over various methods for creating TiO2 photocatalysts with a nanostructure for effective CO2 conversion, photocatalyst structure design, and material modification.