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(A) study on performance enhancement and deactivation behavior of deNOx catalysts for NH3-SCR [전자자료]

(A) study on performance enhancement and deactivation behavior of deNOx catalysts for NH3-SCR [전자자료]

서명 / 저자사항
(A) study on performance enhancement and deactivation behavior of deNOx catalysts for NH3-SCR [전자자료] / Yeon Jae Park
Seoul :   Graduate School, Korea University,   2023  
전자책 1책(xv, 153 p.) : 삽화(일부천연색), 도표
0510   6D5   1243  
지도교수: 이정현  
지도교수: 하헌필  
본표제는 표제면 이미지의 표제임  
참고문헌: p. 141-153
NH3-SCR, catalysis, NOx reduction,,
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245 1 1 ▼a (A) study on performance enhancement and deactivation behavior of deNOx catalysts for NH3-SCR ▼h [전자자료] / ▼d Yeon Jae Park
246 1 1 ▼a NH3-SCR 탈질 촉매의 성능 증진과 피독 거동에 대한 연구
260 ▼a Seoul : ▼b Graduate School, Korea University, ▼c 2023
300 ▼a 전자책 1책(xv, 153 p.) : ▼b 삽화(일부천연색), 도표
500 ▼a 지도교수: 이정현
500 ▼a 지도교수: 하헌필
500 ▼a 본표제는 표제면 이미지의 표제임
502 0 ▼a 학위논문(석사)-- ▼b 고려대학교 대학원, ▼c 화공생명공학과, ▼d 2023. 2
504 ▼a 참고문헌: p. 141-153
653 ▼a NH3-SCR ▼a catalysis ▼a NOx reduction
900 1 0 ▼a Park, Yeon Jae, ▼e
900 1 0 ▼a 이정현, ▼g 李政炫, ▼d 1976-, ▼e 지도교수 ▼0 AUTH(211009)153260
900 1 0 ▼a Lee, Jung-hyun, ▼e 지도교수
900 1 0 ▼a 하헌필, ▼e 지도교수
900 1 0 ▼a Ha, Heon Phil, ▼e 지도교수
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991 ▼a E-Book(학위논문) ▼w (DCOLL211009)000000270364


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(A) study on performance enhancement and deactivation behavior of deNOx catalysts for NH3-SCR [전자자료] (14회 열람)
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No. 소장처 청구기호 등록번호 도서상태 반납예정일 예약 서비스
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Nitrogen oxides generated through various emission sources such as incinerators, power plants, and engines are emitted through the process of burning nitrogen contained in fuel. In accordance with the growing interest in the environment and strengthened environmental regulations, research to reduce pollutants is constantly being conducted. As part of this research, various applications are attempting conversion of fuel, and some conversion of fuel has been made from fossil fuel to liquefied natural gas (LNG) and biomass co-firing. However, even after such conversion of fuel, nitrogen oxides are inevitably generated. Nitrogen oxide is a precursor of particulate matter and causes damage to the environment and human being. These include particulate matter, acid rain, depletion of the ozone layer, photochemical smog, and various diseases. Therefore, NH3-SCR (Selective Catalytic Reduction) technology, which can remove these nitrogen oxides most efficiently and economically, is widely used. This is a technology that uses NH3 as a reductant to convert nitrogen oxides into N2 and H2O that are harmless to the environment and human being. Currently, commercial catalysts for SCR are V2O5/WO3/TiO2 and V2O5/MoO3/TiO2. However, it is necessary to develop a catalyst that is applicable in a low temperature range and has durability against poisonous substances.
We tried to overcome this by changing the surface properties of the catalyst by adding a promoter to the V2O5/TiO2 catalyst. In this study, the optimal contents of Nb and Mo as promoter were derived for the VOx/TiO2-based catalyst to improve activity performance at low temperature and durability against sulfur. Each metal was evenly dispersed in TiO2 without agglomeration. Catalysts to which Nb-Mo is added have abundant V non-stoichiometric species, which facilitates the access of reactants and enhances the performance of the catalyst. In addition, the improved redox property and the amount of active oxygen that can easily participate in the reaction were increased, and an increase in acidic site was also confirmed. In order to confirm that durability against sulfur is excellent compared to existing commercial catalysts, catalysts with the same V content were prepared and compared. When poisoning by injecting sulfur, the catalyst to which Nb-Mo was added maintained more than a certain performance for a longer time, and the ability to decompose and regenerate AS/ABS formed on the catalyst surface was also relatively excellent. It was confirmed that this was because Nb and Mo inhibited adsorption of SO2 on the catalyst surface. Therefore, through the synthesis of the promoters, not only the low-temperature performance was increased, but also the durability to SO2 was significantly increased. Through this enhanced catalyst surface property change (compared to existing commercial catalysts), it can be applied to low-temperature applications and can be used for a long time even when poisoned by SO2 contained in exhaust gas.


 1.1 Background 1
  1.1.1 Necessity of nitrogen oxides removal 1
  1.1.2 Status of various emission sources 10
 1.2 Properties and formation of nitrogen oxides 13
  1.2.1 Definition of nitrogen oxides 13
  1.2.2 Generation of nitrogen oxides 14
  1.2.3 Formation of nitrogen oxides 17
 1.3 Methods for nitrogen oxides removal 23
  1.3.1 Pre-combustion control 25
  1.3.2 Combustion control 26
  1.3.3 Post-combustion control 31
 1.4 Selective Catalytic Reduction 36
  1.4.1 Selective catalytic reduction with HC as a reductant (HC-SCR) 39
  1.4.2 Selective catalytic reduction with H2 or CO as a reductant (H2-SCR, CO-SCR) 40
  1.4.3 Selective catalytic reduction with NH3 as a reductant(NH3-SCR) 42
  1.4.4 Catalysts used in selective catalytic reduction 50
  1.4.5 Physiochemical property and reactivity of SCR catalysts 55
 1.5 SCR reaction mechanism 63
  1.5.1 Langmuir-Hinshelwood assumption mechanism 65
  1.5.2 Eley-Rideal assumption mechanism 69
  1.5.3 Dual Eley-Rideal Langmuir-Hinshelwood mechanism 71
 1.6 Research object and scope 75
 2.1 Catalyst preparation 78
 2.2 Catalytic activity tests 79
 2.3 Catalyst characterization 81
 3.1 Enhancement of catalytic activity doping Nb-Mo on V-based catalysts. 83
  3.1.1 Catalytic activities of catalysts 83
  3.1.2 Structural and textural properties 88
  3.1.3 Acidity 98
  3.1.4 Redox properties 112
  3.1.5 In-situ DRIFTS study 122
  3.1.6 Kinetic study 130
 3.2 Enhancement of SO2 resistance doping Nb-Mo on V-based catalysts. 133
  3.2.1 SO2 tolerance 133
  3.2.2 SO2 regeneration ability 137