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1CO2 UTILIZATION PHOTOKAT 1.11 PhotoKat – Developing active and selective photocatalysts for the reduction of CO2 to form C1 feedstock BMBF Project FKZ 033RC1007 Project Coordinator: Prof. Dr. Jennifer Strunk, Leibniz-Institut für Katalyse e.V. (Project enforcement at Ruhr-Universität Bochum) 1.11.1 Introduction The concept of simply using water and sunlight to transform the greenhouse gas carbon dioxide into fuels and other energy carriers represents an ideal way of reducing the effects of climate change and of boosting the use of sustainable raw materials. Even though this type of sustainable photocatalytic transfor- mation has been extensively studied around the world for more than 30 years, there is no system known at present that can produce the volumes necessary for it to be a viable industrial process. For example, methane production yields typically do not exceed 10 μmol gcat-1 h-1 [1]. Attempts to control selectivity in order to encourage the production of certain products such as methanol or longer chain hydrocarbons have also proved unsuccessful. Many of the pub- lications in this field do not study the full spectrum of products, choosing instead to focus on the formation of the main product over time. One possible reason why yields have not improved significantly over time may be due to the lack of systematic studies. There are also significant differ- ences in the reaction conditions and catalysts used in the published studies, which makes it very difficult to make meaningful comparisons. Furthermore, many materials have not been studied in detail with the exception of titanium dioxide-based based photocatalysts. For example, despite the fact that zinc ox- ide (possibly in mixtures with gallium oxide or gallium nitride) has a surface that appears ideally suited to activating CO2 by forming carbonates, there are almost no studies of this material in the scientific literature [2]. The objective of the ‘PhotoKat’ project was to close this knowledge gap and, by carrying out mechanistic studies of titanium dioxide-based and zinc oxide- based materials, to identify and optimise active and selective photocatalysts for reducing CO2. The research teams working on the project sought to iden- tify robust readily available catalytic systems based on oxide semiconductor composites that exhibited high photon yields and that had the potential to be used in large-scale industrial applications. 88PDF Image | Chemical Processes and Use of CO2
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