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The influence of monoethanolamine on the V-based catalyst activity for NH<sub>3</sub>-SCR reaction
( Danh Thi Huong ),하헌필,정영은,최현,( Pullur Anil Kumar ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
V-Sb/CeO<sub>2</sub>-TiO<sub>2</sub> catalyst was prepared by wet impregnation and deposition precipitation methods for the removal of NOx by NH<sub>3</sub>. The effect of MEA was examined by the number of acidic sites and reduction properties of catalyst by NH<sub>3</sub>-Temperature Programmed Desorption (NH<sub>3</sub>-TPD), H<sub>2</sub>-Temperature Programmed Reduction (H<sub>2</sub>-TPR). The specific functional groups on catalyst’s surface were determined by Fourier transform infrared spectroscopy (FTIR). The characterization studies revealed the enhancement of number of reducible species and acidic sites at low temperature on catalyst added MEA than other catalysts.
Effect of Mn, Fe to cerium vanadate catalyst for NOx reduction with NH3
( Danh Thi Huong ),하헌필,정영은,( Pullur Anil Kumar ),최현 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The effect of Mn- and Fe- to cerium vanadate supported on TiO2-WO3-SiO2 catalyst were prepared and applied to SCR reaction. The properties of these catalysts were characterized by BET surface area, temperature programmed desorption/ reduction, X-ray diffraction methods. The preparation methods were compared. The catalysts showed high activity at high temperatures by ball-mill method. Cerium vanadate catalyst with Fe loaded exhibited higher NOx conversion than Mn loaded one at broad temperature range (250-500°C). The effect of aging condition was also investigated. The redox and acid/base properties of catalyst played important roles on the performance of catalyst.
Vanadium oxide-based extruded honeycomb monolith catalyst for abatement of NOx with NH<sub>3</sub>
정영은,하헌필,이관영,( Danh Thi Huong ),( Pullur Anil Kumar ),최현 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Vanadium based monolith type catalyst was carried out for the selective catalytic reduction(SCR) of NO<sub>x</sub> by NH<sub>3</sub>. The monolith catalyst can be adjusted to reduce the simulate exhaust gas of marine engine at wide temperature (150~500°C). The characteristics of the monolith catalysts were thoroughly characterized by surface area, temperature programmed desorption (TPD) of NO, SO<sub>2</sub> and NH<sub>3</sub>, X-ray Fluorescence (XRF) spectrometer and scanning electron microscope (SEM). The Vanadum based monolith catalyst showed higher activity at low temperature about 200C under SO<sub>2</sub> and H<sub>2</sub>O condition than commercial catalyst.
Pure powder와 Precursor를 Ball milling하여 NH<sub>3</sub> SCR의 NO Conversion을 활성 비교
최현,하헌필,이관영,정영은,( Pullur Anil Kumar ),( Danh Thi Huong ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The object of this study is to check the ball milling effect on the catalytic activity of V-based catalysts for NH<sub>3</sub>-SCR. The catalysts prepared by varying the precursors and pure oxide of Ce through ball milling. X-ray diffraction (XRD) was used to analyze crystal size of oxides after ball milling. All the prepared catalysts were characterized by BET-SA, NH<sub>3</sub>-TPR, H<sub>2</sub>-TPR and XPS. Finally, the catalysts were evaluated for NOx reduction with NH<sub>3</sub> at different temperatures.
Nd promoted Vanadia-Ceria catalysts for low temperature NH₃-SCR
최현,하헌필,( Pullur Anil Kumar ),정영은,( Danh Thi Huong ),이관영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Composite catalysts by doping Nd into vanadia-ceria are prepared to obtain further improved catalytic properties by homogeneous precipitation method using urea as a precipitation agent which exhibits high NOx conversion at 150-400C. The results showed that the Nd help to increase the activity of vanadia-ceria for NH₃- SCR, The SCR mechanism is investigated through various characterizations, such as XRD, BET-SA,XPS, NH₃- TPD, H₂- TPD and FE-SEM.
Optimization of Spin-Valve Structure NiFe/Cu/NiFe/IrMn for Planar Hall Effect Based Biochips
Bui Dinh Tu,Le Viet Cuong,Tran Quang Hung,Do Thi Huong Giang,Tran Mau Danh,Nguyen Huu Duc,CheolGi Kim IEEE 2009 IEEE transactions on magnetics Vol.45 No.6
<P>This paper deals with the planar Hall effect (PHE) of Ta(5)/NiFe(t<SUB>F</SUB>)/Cu(1.2)/NiFe(t<SUB>P</SUB>)/IrMn(15)/Ta(5) (nm) spin-valve structures. Experimental investigations are performed for 50 mumtimes50 mum junctions with various thicknesses of free layer (t<SUB>F</SUB> = 4, 8, 10, 12, 16, 26 nm) and pinned layer (t<SUB>P</SUB> = 1, 2, 6, 8, 9, 12 nm). The results show that the thicker free layers, the higher PHE signal is observed. In addition, the thicker pinned layers lower PHE signal. The highest PHE sensitivity S of 196 muV/(kA/m) is obtained in the spin-valve configuration with t<SUB>F</SUB> = 26 nm and t<SUB>P</SUB> = 1 nm. The results are discussed in terms of the spin twist as well as to the coherent rotation of the magnetization in the individual ferromagnetic layers. This optimization is rather promising for the spintronic biochip developments.</P>