\u25c6 There is a strong anticipation for the reduction of reliance on fossil fuel and the mitigation of carbon dioxide emissions toward the realization of carbon neutrality in 2050.<\/p>\n
\u25c6 New materials and processes that enable the chemical conversion of CO2<\/sub> to CO at temperatures around 100 \u00b0C, which conventionally required temperatures \u2265 700 \u00b0C, have been developed.<\/p>\n \u25c6 This technology involves the recycling of CO2<\/sub> as necessary, especially when there is surplus renewable energy, while greatly mitigating heat loss.<\/p>\n The research group led by Professor Yasushi Sekine<\/a> of the Faculty of Science and Engineering, Waseda University, identified new materials and processes that enable the chemical conversion of CO2<\/sub> to CO *1<\/sup>, which conventionally required \u2265 700 \u00b0C, to be achieved at low temperatures around 100 \u00b0C.<\/p>\n There is a high anticipation for the reduction of reliance on fossil fuel and the mitigation of CO2<\/sub> emissions toward the realization of carbon neutrality in 2050. Under these circumstances, if chemical products can be produced with hydrogen derived from renewable energy, using recovered CO2<\/sub> as a raw material, it will be possible to recycle CO2<\/sub> and reduce the reliance on fossil fuels. This technology enables the recycling of CO2<\/sub> as necessary, especially during the periods of surplus renewable energy, while greatly suppressing heat loss.<\/p>\n The results of this research were published on November 29, 2022 (local time), in the online version of EES Catalysis <\/a>by the Royal Society of Catalysis.<\/p>\n Article name: Non-conventional low-temperature reverse water\u2013gas shift reaction over highly dispersed Ru catalysts in an electric field<\/a><\/p>\n DOI: 10.1039\/D2CP04108A<\/p>\n Recovered CO2 reacts with hydrogen derived from renewable energy to produce CO in a reaction known as the reverse water-gas shift reaction*2, and this reaction is represented by the following formula.<\/p>\n CO2\uff0bH2\u2192CO\uff0bH2O<\/p>\n This reaction is endothermic, and hence, it requires a high temperature and has conventionally been conducted as a catalytic reaction at temperatures \u2265 700 \u00b0C. The high temperature associated with this reaction poses a challenge, which makes it difficult to drive the process on-demand using renewable energy.<\/p>\n The research group has been investigating a new technology to promote the reverse water-gas shift at a low temperature of around 150 \u00b0C, with a high reaction rate and high selectivity. The group developed a catalytic reaction with an externally applied electric field that can achieve this goal and identified catalysts and processes that can exhibit higher performance at low temperatures. The research group found that a heterogeneous catalyst, in which ruthenium metal particles are supported on a stable oxide called zirconium titanate, was very effective for this process.<\/p>\n The research group found that the application of an external direct current electric field and the induction of surface ionics facilitated the reaction at low temperatures by various operando spectroscopic analysis*3. The reaction was proceeded by a new reaction mechanism, as shown in the figure below.<\/p>\n This technology makes it possible to chemically convert CO2 to CO at a temperature around 100 \u00b0C, instead of the conventional temperatures of \u2265 700 \u00b0C, and it involves a temperature range close to that of subsequent organic synthesis reactions. Therefore, with this technology, the overall heat loss is greatly reduced, and the process is expected to be driven on-demand. This enables the recycling of CO2 as necessary, especially during the periods of surplus renewable energy.<\/p>\n It is expected that the results of laboratory tests at the university will be used as a basis for scaling up the process.<\/p>\n The reverse water-gas shift is an important reaction with an easily identifiable chemical formula. CO serves as an important building block for various raw chemical materials. However, the reverse water-gas shift reaction requires high temperatures higher than 700 \u00b0C. The newly developed technology enables this reaction to easily proceed at a temperature as low as 100 \u00b0C, and this has the potential for on-demand chemical synthesis using recovered carbon dioxide. We aim to develop this technology into an exceptional product through collaborations with private companies.<\/p>\n *1 Carbon monoxide<\/p>\n A molecule that can be written as CO. It is a very important molecule that could be used as a raw material for the synthesis of various kinds of fuels and chemical products.<\/p>\n *2<\/sup> Reverse water-gas shift<\/p>\n Reaction of carbon dioxide and hydrogen to produce carbon monoxide. It is an endothermic reaction of approximately 42 kJ\/mol; hence, high temperatures are required due to equilibrium constraints.<\/p>\n *3<\/sup> Operando spectroscopy<\/p>\n This involves live observation of the surface of a solid catalyst in the working environment. It is a technique that allows the viewer to see the nature of a working catalyst.<\/p>\n \u30fbJournal name\uff1aEES Catalysis<\/a> \uff08EES=Energy Environmental Science\uff09<\/p>\n \u30fbArticle name\uff1aNon-conventional low-temperature reverse water\u2013gas shift reaction over highly dispersed Ru catalysts in an electric field<\/a><\/p>\n \u30fbAuthor\u2019s name (name of affiliated institution)\uff1aRyota Yamano\uff08Waseda University\uff09, Shuhei Ogo\uff08Kouchi University\uff09, Naoya Nakano\uff08Waseda University\uff09, Takuma Higo\uff08Waseda University\uff09, Yasushi Sekine*\uff08Waseda University\uff09<\/p>\n \u30fbDate of publication (local time)\uff1aNovember 29, 2022<\/p>\n \u30fbURL\uff1ahttps:\/\/pubs.rsc.org\/en\/content\/articlelanding\/2023\/ey\/d2ey00004k<\/a><\/p>\n \u30fbDOI\uff1a10.1039\/D2EY00004K<\/a><\/p>\n(1) What is known from previous research<\/strong><\/h4>\n
\u00a0(2) What was newly attempted and clarified in the present research<\/strong><\/h4>\n
![\"\"](\"https:\/\/www.waseda.jp\/inst\/wcans\/assets\/uploads\/2023\/05\/36894356d1099d3fd45f900c7ad13163.png\")
<\/p>\n(3) Newly developed method<\/strong><\/h4>\n
![\"\"](\"https:\/\/www.waseda.jp\/inst\/wcans\/assets\/uploads\/2023\/05\/319377eb108d2d1d7dad3c7e9fd07077-610x160.png\")
<\/p>\n(4) Ripple effects and social impacts of this research<\/strong><\/h4>\n
(5) Future issues<\/strong><\/h4>\n
(6) Researcher comments<\/strong><\/h4>\n
(7) Glossary<\/strong><\/h4>\n
(8) Article information<\/strong><\/h4>\n
Links<\/h4>\n