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RISS 인기검색어
- 검색키워드
- 저자 : Docao, Son (검색결과 3 건)
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Solar photochemical-thermal water splitting at 140 °C with Cu-loaded TiO<sub>2</sub>
Docao, Son,Koirala, Agni Raj,Kim, Min Gyu,Hwang, In Chul,Song, Mee Kyung,Yoon, Kyung Byung Royal Society of Chemistry 2017 ENERGY AND ENVIRONMENTAL SCIENCE Vol.10 No.2
<P>Metal oxide based solar thermal water splitting is a promising approach for using solar energy to produce H2 and O2. The normal protocol employed for this process involves thermal reduction of a metal oxide (MOx) at around 1500 °C to produce the reduced form of the metal oxide (MOx−δ) and O2. This step is followed by steam treatment of MOx−δ at around 1000 °C to yield MOx and H2. Owing to the need to use high temperatures, the traditional approach has several important drawbacks. In a study designed to improve this process, we found that Cu-loaded TiO2 (Cu/TiO2) effectively expels O2 upon irradiation with AM 1.5 1 Sun solar simulated light and that treatment of the reduced form of the reduction product Cu/TiO2−δ with steam at 140 °C generates H2. This new approach, termed as solar photochemical-thermal water splitting, has the potential to become an important method for converting solar energy into chemical energy.</P>
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Koirala, Agni Raj,Docao, Son,Lee, Seong Beom,Yoon, Kyung Byung Elsevier 2015 CATALYSIS TODAY - Vol.243 No.-
<P><B>Abstract</B></P> <P>The experimental artificial photosynthesis (AP) systems, which have attempted AP by photo-irradiation of single-chamber reactors containing CO<SUB>2</SUB>, H<SUB>2</SUB>O, and metal-loaded TiO<SUB>2</SUB>, have received great attention during the last three decades. Such one-pot AP systems cannot be efficient because the catalysts have water oxidation sites which can oxidize the carbon-containing organic fuels more readily than water. Despite this, methanol has been the most desired product from such AP systems due to its many merits. However, CH<SUB>4</SUB> and CO have been produced as major products under normal conditions (1bar of CO<SUB>2</SUB>, 1sun, neutral condition, and irradiation wavelength>350nm). From a systematic study aimed to elucidate the fate of methanol in such one-pot AP systems with novel metal nanoparticle loaded TiO<SUB>2</SUB> (M<SUB> <I>n</I> </SUB>–TiO<SUB>2</SUB>, M=Pd, Pt, Cu and Au) as the catalyst we found that methanol and its related products formaldehyde and formic acid are not produced from such one-pot AP systems, indicating that the gaseous products should be produced from the pathways which do not involve methanol and the less-reduced products as intermediates or side products. We also elucidated that when methanol is added into the AP system, as many as fifteen different reactions take place as shown in Scheme 1. The reaction is initiated by photoinduced excitation of the charge-transfer (CT) band from methanol to TiO<SUB>2</SUB> surface, which appears in the UV region, by the UV part of the solar light. These reactions bear the potential to be used for production of various compounds.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Photocatalytic reaction of methanol and water vapors on M–TiO<SUB>2</SUB> was studied. </LI> <LI> Fifteen different reactions simultaneously take place during this reaction. </LI> <LI> One-pot photoreaction of CO<SUB>2</SUB> and H<SUB>2</SUB>O on M–TiO<SUB>2</SUB> has been studied for long time. </LI> <LI> Explains why CH<SUB>4</SUB> and CO are the major products from the above one-pot reaction. </LI> <LI> Explains why CH<SUB>3</SUB>OH, HCOH, and HCOOH cannot be intermediates in the above reaction. </LI> </UL> </P>
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CO<sub>2</sub> capture from humid flue gases and humid atmosphere using a microporous coppersilicate
Datta, Shuvo Jit,Khumnoon, Chutharat,Lee, Zhen Hao,Moon, Won Kyung,Docao, Son,Nguyen, Thanh Huu,Hwang, In Chul,Moon, Dohyun,Oleynikov, Peter,Terasaki, Osamu,Yoon, Kyung Byung American Association for the Advancement of Scienc 2015 Science Vol.350 No.6258
<P><B>Grabbing CO<SUB>2</SUB> from wet gas streams</B></P><P>It is a challenge to extract CO<SUB>2</SUB> from typical gas streams, such as the flue gas from a power plant. This is because any water in the stream tends to prevent CO<SUB>2</SUB> absorption and may also degrade the absorbing material. Datte <I>et al.</I> developed a microporous copper silicate that avoids these problems. Most other materials have sites that absorb both water and CO<SUB>2</SUB> at the same sites, and in that fight, the water tends to win. Although their material still absorbs water, it has separate sites for the CO<SUB>2</SUB> absorption. It also shows good stability despite the absorbed water and can be reused.</P><P><I>Science</I>, this issue p. 302</P><P>Capturing CO<SUB>2</SUB> from humid flue gases and atmosphere with porous materials remains costly because prior dehydration of the gases is required. A large number of microporous materials with physical adsorption capacity have been developed as CO<SUB>2</SUB>-capturing materials. However, most of them suffer from CO<SUB>2</SUB> sorption capacity reduction or structure decomposition that is caused by co-adsorbed H<SUB>2</SUB>O when exposed to humid flue gases and atmosphere. We report a highly stable microporous coppersilicate. It has H<SUB>2</SUB>O-specific and CO<SUB>2</SUB>-specific adsorption sites but does not have H<SUB>2</SUB>O/CO<SUB>2</SUB>-sharing sites. Therefore, it readily adsorbs both H<SUB>2</SUB>O and CO<SUB>2</SUB> from the humid flue gases and atmosphere, but the adsorbing H<SUB>2</SUB>O does not interfere with the adsorption of CO<SUB>2</SUB>. It is also highly stable after adsorption of H<SUB>2</SUB>O and CO<SUB>2</SUB> because it was synthesized hydrothermally.</P>
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