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Lee, Kyungseok,Kosaka, Hidenori,Sato, Susumu,Yokoi, Toshiyuki,Choi, Byungchul,Kim, Daesuk Elsevier 2019 Journal of industrial and engineering chemistry Vol.72 No.-
<P><B>Abstract</B></P> <P>The objective of this study is to investigate the catalytic performance of Cu-zeolite catalysts supported on various types of zeolites (chabazite, MFI, and BEA) for selective catalytic reduction with C<SUB>3</SUB>H<SUB>6</SUB>. 2Cu/ZSM-5 exhibited a nearly 70% de-NOx performance at 360°C, Cu/SSZ-13 and Cu/BETA exhibited less than 60%. The loading of Cu also exhibited different de-NOx performances, which were related to the chemical states of Cu. The isolated Cu<SUP>2+</SUP> ion was favorable to the NOx reduction compared to the bulk CuOx species. The effects of O<SUB>2</SUB>, CO<SUB>2</SUB> concentrations and hydrothermal aging were investigated for the 2Cu/ZSM-5 catalyst.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Various amounts of Cu were impregnated into SSZ-13, ZSM-5 and BETA zeolite. </LI> <LI> 2Cu/ZSM-5 exhibited the highest NOx conversion. </LI> <LI> O<SUB>2</SUB> significantly affected temperature window of NOx reduction for C<SUB>3</SUB>H<SUB>6</SUB>-SCR. </LI> <LI> CO<SUB>2</SUB> negatively impacted on NOx conversion and partial oxidation of C<SUB>3</SUB>H<SUB>6</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
이경석,Hidenori Kosaka,Susumu Sato,Toshiyuki Yokoi,최병철,김대석 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
The objective of this study is to investigate the catalytic performance of Cu-zeolite catalysts supported on various types of zeolites (chabazite, MFI, and BEA) for selective catalytic reduction with C3H6. 2Cu/ZSM-5 exhibited a nearly 70% de-NOx performance at 360 °C, Cu/SSZ-13 and Cu/BETA exhibited less than 60%. The loading of Cu also exhibited different de-NOx performances, which were related to the chemical states of Cu. The isolated Cu2+ ion was favorable to the NOx reduction compared to the bulk CuOx species. The effects of O2, CO2 concentrations and hydrothermal aging were investigated for the 2Cu/ZSM-5 catalyst.
Novel angular evaluation method for radiation field using Lie derivative
Anetai Yusuke,Kinami Shinji,Koike Yuhei,Kamojima Takeo,Yokoi Masanori,Nishikawa Toshiyuki,Hirokawa Keiko,Ishii Yoshie,Takegawa Hideki 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.11
In radiotherapy, quality assurance (QA) for beam delivery from linear accelerator (linac) of treatment machine is a highly crucial factor for accurate radiotherapy because of the fuctuations in the conditions of the machine. The radiation feld is one of the important evaluation items, and this has been well-checked by crossline (right-to-left) and inline (caudal-to-cranial) profles. Diagonal or angular profles of the radiation feld are also an important component of irradiation feld; however, these are frequently omitted or not fully taken into account as it requires inefcient measurements. To detect the angular and radial conditions of the radiation feld, we proposed a novel evaluation method using Lie derivative analysis against radiochromic flm dosimetry in this study. This method directly compared the detected dose distributions with the calculations, obtained the discrepancy of the fow feld from the mathematical characteristic of Lie derivative, resulted in a detection of the radial and angular discrepancies that have not been handled by conventional gamma analysis.