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PHOTOCATALYTIC DECOMPOSITION OF N2O AND CU+/Y-ZEOLITE CATALYSTS PREPARED BY ION - EXCHANGE
Anpo, Masakazu,Matsuoka, Masaya,Hano, Kanami,Mishima, Hirotsugu,Ono, Takehiko,Yamashita, Hiromi 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.6
In situ characterization of Cu^+/Y-zeolite catalysts and their photocatalytic reactivities for the decomposition of N₂O into N₂and O₂have been investigated by means of in situ photoluminescence, XAFS, and ESR techniques along with an analysis of the reaction products. It was found that Cu(Ⅰ) ions included within the nanopores of Y-zeolite exist as the [Cu(Ⅰ)--Cu(Ⅰ)] dimer species as well as the isolated Cu(Ⅰ) monomer species, their ratio being much dependent on the SiO₂/Al₂O₃ratio of Y-zeolite. UV irradiation of these Cu^+/Y-zeolite catalysts in the presence of N₂O led to the photocatalytic decomposition of N₂O into N₂ and O₂at temperatures as low as 275 K. The electronically excited state of Cu(I) ion (3d^94s¹state) plays a vital role in the photocatalytic decomposition of N₂O into N₂and O₂. The photocatalytic reactivity of these Cu^+/zeolite catalysts was found to be strongly affected by the local structure of the Cu(Ⅰ) ions which could easily be modified by changing the SiO₂/Al₂O₃ratio of Y-zeolite. The isolated linear 2 coordinated Cu(Ⅰ) monomer species formed on Y-zeolite having a moderate SiO₂/Al₂O₃ratio exhibited a high photocatalytic reactivity for the direct decomposition of N₂O into N₂and O₂, clearly showing the importance of the coordinative unsaturation of the active sites.
Articles : Photocatalytic Decomposition of N2O on Cu(+)/Y-Zeolite Catalysts Prepared by Ion-Exchange
( Masakazu Anpo ),( Masaya Matsuoka ),( Kanami Hano ),( Hirotsugu Mishima ),( Takehiko Ono ),( Hiromi Yamashita ) 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.6
In situ characterization of Cu^+/Y-zeolite catalysts and their photocatalytic reactivities for the decomposition of N₂O into N₂and O₂have been investigated by means of in situ photoluminescence, XAFS, and ESR techniques along with an analysis of the reaction products. It was found that Cu(Ⅰ) ions included within the nanopores of Y-zeolite exist as the [Cu(Ⅰ)--Cu(Ⅰ)] dimer species as well as the isolated Cu(Ⅰ) monomer species, their ratio being much dependent on the SiO₂/Al₂O₃ratio of Y-zeolite. UV irradiation of these Cu^+/Y-zeolite catalysts in the presence of N₂O led to the photocatalytic decomposition of N₂O into N₂ and O₂at temperatures as low as 275 K. The electronically excited state of Cu(I) ion (3d^94s¹state) plays a vital role in the photocatalytic decomposition of N₂O into N₂and O₂. The photocatalytic reactivity of these Cu^+/zeolite catalysts was found to be strongly affected by the local structure of the Cu(Ⅰ) ions which could easily be modified by changing the SiO₂/Al₂O₃ratio of Y-zeolite. The isolated linear 2 coordinated Cu(Ⅰ) monomer species formed on Y-zeolite having a moderate SiO₂/Al₂O₃ratio exhibited a high photocatalytic reactivity for the direct decomposition of N₂O into N₂and O₂, clearly showing the importance of the coordinative unsaturation of the active sites.
Shul, Yong Gun,Yamashita, Hiromi,Anpo, Masakazu,Jung, Kyeong Taek 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.3
TS-1 zeolite film has been prepared by using nano sized TS-1 zeolite particles for the photocatalytic isomerization of cis-2-butene. TS-1 zeolite film showed optical transparent property and the thickness of film was 0.7 ㎛. UV irradiation of TS-1 zeolite film in the presence of cis-2-butene leads to the photocatalytic isomerization of cis-2-butene into trans-2-butene at the temperature of 275 K. The yield of trans-2-butene was linearly increased with UV-irradiation time.
Jie, HyunSeock,Park, Hoon,Chae, Keun-Hwa,Anpo, Masakazu,Park, Jong-Ku Elsevier 2009 Chemical physics letters Vol.470 No.4
<P><B>Graphical abstract</B></P><P>The variation of relative peak area between t<SUB>2g</SUB> and e<SUB>g</SUB> at each irradiation condition.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>An in-situ NEXAFS study was performed to directly investigate the change in the hole structures in the conduction band of TiO<SUB>2</SUB> nanopowders synthesized using a flame method under UV irradiation. The anatase/rutile phase boundary was found to suppress the hole–electron recombination, leading to improved photoreactivity of TiO<SUB>2</SUB> nanopowders.</P>
박훈,HyunSeock Jie,채근화,박종구,Masakazu Anpo,Dok-Yol Lee 한국물리학회 2008 Current Applied Physics Vol.8 No.6
Anatase-type TiO₂ nanopowders less than 10 nm in average diameter were synthesized by a chemical vapor synthesis method. The TiO₂ nanopowders showed very poor photocatalytic properties, in spite of their large surface area. With subsequent heat treatment of the TiO₂ powders, their photocatalytic properties determined by measuring the degradation of 2-propanol were improved at temperatures up to 600˚C and then diminished along with formation of a rutile phase. This improvement in the photocatalytic properties of TiO₂ nanopowders was attributed to both a morphology change and a change in the electronic surface characteristics of TiO₂ particles during heat treatment. Anatase-type TiO₂ nanopowders less than 10 nm in average diameter were synthesized by a chemical vapor synthesis method. The TiO₂ nanopowders showed very poor photocatalytic properties, in spite of their large surface area. With subsequent heat treatment of the TiO₂ powders, their photocatalytic properties determined by measuring the degradation of 2-propanol were improved at temperatures up to 600˚C and then diminished along with formation of a rutile phase. This improvement in the photocatalytic properties of TiO₂ nanopowders was attributed to both a morphology change and a change in the electronic surface characteristics of TiO₂ particles during heat treatment.
( Kyeong Taek Jung ),( Yong Gun Shul ),( Masakazu Anpo ),( Hiromi Yamashita ) 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.3
TS-1 zeolite film has been prepared by using nano sized TS-1 zeolite particles for the photocatalytic isomerization of cis-2-butene. TS-1 zeolite film showed optical transparent property and the thickness of film was 0.7 ㎛. UV irradiation of TS-1 zeolite film in the presence of cis-2-butene leads to the photocatalytic isomerization of cis-2-butene into trans-2-butene at the temperature of 275 K. The yield of trans-2-butene was linearly increased with UV-irradiation time.