Qin Yong research team of Shanxi Institute of coal and chemical industry, Chinese Academy of Sciences uses Cu / TiO2 catalyst to realize photothermal conversion of CO2 and H2O to olefin

Artificial photosynthesis can convert CO2 and H2O into hydrocarbons, which is a new way to realize carbon cycle How to transform CO2 into high value chemicals such as low-carbon olefins is a hot and difficult research topic Qin Yong research team of Shanxi Institute of coal chemistry, Chinese Academy of Sciences prepared a kind of Cu single atom layer cluster catalyst with TiO 2 tube confinement by atomic layer deposition technology, which realized the high selectivity of CO 2 and H 2O to produce low-carbon olefins The results were published in appl Catalyst B: environment (DOI: 10.1016 / j.apcatb 2019.118133) under the title of "photocatalytic conversion of CO 2 into light solutions over TiO 2 nanotube defined Cu clusters with high ratio of Cu +" The first author is Dr Ge Huibin, and the corresponding author is researcher Qin Yong and associate researcher Zhang Bin In this work, a new method of atomic layer deposition of copper using trimethyl aluminum and bis (hexafluoroacetylacetone) copper as precursors was developed The catalyst of Ti nanotube confined Cu monolayer cluster was prepared by using this method combined with template, reduction and reoxidation strategy The activity of Cu (100) / TiO 2-ro catalyst for CO 2 and H 2O can be increased with the increase of reaction temperature and light intensity The selectivity of light olefins can reach 60% at 150 ℃ High light intensity and temperature are not conducive to the formation of low-carbon olefins, and effective photo thermal co catalysis is the key to achieve high selectivity of olefins The results of systematic control experiments and characterization show that zero valent copper species are beneficial to the formation of methane, and the selectivity of low-carbon olefins is positively correlated with Cu + / (Cu 0 + Cu +) in Cu clusters The highly dispersed Cu + species on TiO2 nanotubes can control the hydrogenation of surface carbon species, promote carbon carbon coupling and improve the selectivity of low-carbon olefins This work has been supported by NSFC, NSFC, youth innovation promotion association of Chinese Academy of Sciences, open project of Key Laboratory of low carbon transformation science and engineering of Chinese Academy of Sciences, 100 person plan of Shanxi Province and Shanghai light source, which can provide new ideas for further design of high performance artificial photosynthesis catalyst.