V₂O₅/TiO₂ 촉매의 Ball Milling에 따른 산소 거동 특성 연구

권동욱,박광희,이상문,장두훈,홍성창,Kwon, Dong Wook,Park, Kwang Hee,Lee, Sang Moon,Jang, Du Hun,Hong, Sung Chang 한국공업화학회 2011 공업화학 Vol.22 No.6

Ball milling을 이용하여 제조한 $NH_3-SCR$용 $V_2O_5/TiO_2$ 촉매의 산소 거동 특성을 연구하였다. Ball milling으로 인한 촉매 $TiO_2$의 결정구조, 비표면적 변화는 없지만 $H_2-TPR$분석에서는 최대 환원온도가 저온으로 이동한다. 산소농도를 달리한 반응성 실험에서 모든 촉매는 산소가 없을 때 매우 낮은 NOx 전환율을 보이고, 산소 농도에 따라 BMC (Ball Milling Catalyst)의 활성이 더 우수한 경향을 나타낸다. 이는 격자산소와 기상산소의 반응참여 정도가 NMC (No Milling Catalyst) 보다 더 크기 때문이다. We study on the oxygen behavior of $V_2O_5/TiO_2$ catalysts in the $NH_3$-selective catalytic reduction (SCR) prepared by the ball milling processing. There are not any changes in crystal structure and surface area of the $TiO_2$ catalyst by ball milling, but the maximal reduction temperature decreased in $H_2$-temperature programmed reduction (TPR) analysis. Experimental observations with various concentrations of oxygen indicate that all catalysts showed a very low NOx conversion rate in the absence of oxygen and the reactivity of ball milled catalyst higher depending on the oxygen. It is occurred because the degree of participation of atmospheric oxygen and lattice oxygen is great than that of the not-milled catalyst.

Pd/TiO2 촉매를 이용한 CH4, CO의 동시산화 연구

이현희 ( Hyun Hee Lee ),장두훈 ( Du Hun Jang ),홍성창 ( Sung Chang Hong ) 한국공업화학회 2012 공업화학 Vol.23 No.3

본 연구는 Pd/TiO2 촉매를 이용한 CH4, CO 동시 산화반응에서 활성점 및 Pd의 산화 상태에 대한 영향을 조사하였다. Pd 함량이 증가할수록 Pd 종(PdO)의 결정성장을 야기시켜 CH4 산화반응 활성을 증진시켰다. 열처리를 통해 제조된 촉매표면의 Pd 산화상태에 따라 CH4과 CO의 산화반응 활성이 상이한 결과를 나타내었다. XRD와 H2-TPR 분석으로 소성촉매는 Pd 2+ 종, 환원촉매는 Pd 0 종이 우점하고 있음을 확인하였다. 또한, BET분석을 통해 촉매 활성인자인 비표 면적 및 기공부피보다는 Pd의 산화상태가 촉매 활성에 미치는 중요한 인자임을 알 수 있었다. FT-IR 분석을 이용하여 Pd의 산화상태에 따른 CH4과 CO의 반응 메커니즘을 확인할 수 있었다. The effects of active sites and valence states were investigated over Pd/TiO2 catalyst on simultaneous oxidation of CH4 and CO. The Pd species (PdO) crystallite size increased with increasing Pd loadings, which results in enhancement of the activity of CH4 oxidation. Different results from the activity of CH4 and CO oxidation were shown to be dependent on the Pd valence state on the surface of the catalyst prepared through a thermal treatment. XRD and H2-TPR analysis confirmed that Pd 2+ species was predominated in the calcination catalyst, while Pd 0 species was predominated in the reduction catalyst. Additionally, it could be found that the valence state of Pd was a more important factor on the catalytic activity than that of factors as the surface area and pore volume. The reaction mechanism of CH4 and CO followed by the valence state of Pd could be identified using FT-IR analysis.

산업체 발생 대기오염물질 저감을 위한 에너지절감형 융합시스템

이명화(Myong-Hwa Lee),장두훈(Du-Hun Jang),이승제(Seung-Je Lee),송재준(Jae-Jun Song),홍성희(Sung-Hee Hong),김상범(Sang Bum Kim) 한국열환경공학회 2010 한국열환경공학회 학술대회지 Vol.2010 No.추계

다양한 귀금속 촉매를 이용한 NOx의 탄화수소 선택적촉매환원 반응 특성에 관한 연구

김성수(Sung Su Kim),장두훈(Du Hun Jang),홍성창(Sung Chang Hong) 한국청정기술학회 2011 청정기술 Vol.17 No.3

다양한 귀금속 촉매를 이용한 hydrocarbon selective catalytic reduction 반응특성을 조사하였다. 가장 우수한 활성금속은 Pt, 지지체는 활성금속과 지지체간 강한 상호작용에 의하여 CeO₂, TiO₂였으며, NOx 전환율은 약 55%를 나타내었다. 활성금속으로서 Pd, Rh, Ag 촉매들은 20% 미만의 전환율을 보였으며, 지지체로서 SiO₂, ZrO₂ 또한 다른 지지체들보다 저조한 활성을 나타내었다. 조업조건에 따른 촉매의 성능을 조사하기 위하여 환원제의 종류, 양, 산소농도, 공간속도에 따른 실험을 수행하였다. 환원제로서 메탄이 프로판보다 우수함을 확인하였고, 메탄/질소산화물 비가 증가할수록 성능이 우수하였으며, 산소농도가 증가할수록, 그리고 공간속도가 감소할수록 촉매의 성능은 증가함을 확인할 수 있었다. Characteristics of hydrocarbon selective catalytic reduction of NOx using various noble metal catalysts were investigated. The best active metal is Pt, supports are CeO₂ and TiO₂ by strong interactions between active metals, and 55% of conversion rate of NOx is shown. Pd, Rh and Ag catalysts presented a conversion of less than 20% as active metals, and supports also showed the poor activity compared to SiO₂ and ZrO₂. Experiments were performed with different types of reducing agents, amount, concentration of oxygen and space velocity in order to investigate the performance of catalysts according to operating conditions. The results confirm that the methane is better than propane as a reducing agent, and as the ratio of methane/nitrogen oxide increases, the catalytic activity increased, as the concentration of oxygen increases and space velocity decreases, the performance of catalysts increased.

근원적인 화재예방을 위한 CHF 적용 가능성 연구

김영희(Young Hee Kim),장두훈(Du Hun Jang),서필원(Phil Won Seo),최재욱(Jae Wook Choi) 한국정보기술학회 2022 한국정보기술학회논문지 Vol.20 No.11

Due to industrial bodies requiring various chemical substances, todays industrial society has diversified chemical substances, and along with this, the chemical substances used are becoming more complex and larger. Accordingly, most industries discharge volatile organic compounds and mainly apply activated carbon adsorption method as a removal method. However, there is always a fire risk in the activated carbon adsorption process of organic solvents, and there are many cases where the site manager or designer is unaware of the fire phenomenon in the activated carbon adsorption tower. In 2015, a fire broke out in an activated carbon storage tank of a synthetic fiber manufacturer in Ulsan, and the fire spread to nearby junk stores. This study aims to confirm the possibility of preventing fire and explosion through experiments so that CHF(Carbon Honeycomb Filter) can be used as a fundamental fire prevention and renewable eco-friendly material.

백금 코팅 메탈필터소재의 Soot 산화반응에 대한 활성 연구

홍성창 ( Sung Chang Hong ),김성수 ( Sung Su Kim ),이상문 ( Sang Moon Lee ),장두훈 ( Du Hun Jang ),배세현 ( Se Hyun Bae ) 한국공업화학회 2011 공업화학 Vol.22 No.4

백금이 코팅된 메탈 필터 소재의 NOx, soot 산화반응의 안정성 및 활성에 대하여 연구하였다. NOx와 soot 산화실험은 독립 또는 동시에 반응시킨 조건으로 수행되었다. 그 결과, 백금이 코팅된 소재는 20%의 NO의 NO2로의 전환반응, 약 10%의 NOx 분해반응 그리고 soot의 완전산화반응이 진행됨을 보였다. Soot 산화반응은 NO2의 생성으로 인하여 반응온도가 더 저온으로(약 30 ℃) 이동할 수 있었다. 코팅 소재는 Pt/Al2O3 또는 Pt/TiO2 촉매보다 표면구조의 안정성 으로 인하여 열충격에 대한 내구성이 우수하였다. The activity and stability of the metal filter material Pt coated on NOx and soot oxidation were examined. The catalytic reaction test for NOx and soot were also performed independently and simultaneously. As a result, it showed the NO to NO2 shift reaction with 20% conversion, NOx decomposition (about 10%) and perfect soot oxidation on the material Pt coated proceeded. Onset temperature of soot oxidation shift to lower temperature (about 30 ℃) by generated NO2. The material also was less affected by thermal shock than Pt/Al2O3 or Pt/TiO2 catalysts due to its stability of surface structure.

V2O5/TiO2 촉매의 Ball Milling에 따른 산소 거동 특성 연구

권동욱 ( Dong Wook Kwon ),박광희 ( Kwang Hee Park ),이상문 ( Sang Moon Lee ),장두훈 ( Du Hun Jang ),홍성창 ( Sung Chang Hong ) 한국공업화학회 2011 공업화학 Vol.22 No.6

Ball milling을 이용하여 제조한 NH3-SCR용 V2O5/TiO2 촉매의 산소 거동 특성을 연구하였다. Ball milling으로 인한 촉매 TiO2의 결정구조, 비표면적 변화는 없지만 H2-TPR분석에서는 최대 환원온도가 저온으로 이동한다. 산소농도를 달리한 반응성 실험에서 모든 촉매는 산소가 없을 때 매우 낮은 NOx 전환율을 보이고, 산소 농도에 따라 BMC (Ball Milling Catalyst)의 활성이 더 우수한 경향을 나타낸다. 이는 격자산소와 기상산소의 반응참여 정도가 NMC (No Milling Catalyst) 보다 더 크기 때문이다. We study on the oxygen behavior of V2O5/TiO2 catalysts in the NH3-selective catalytic reduction (SCR) prepared by the ball milling processing. There are not any changes in crystal structure and surface area of the TiO2 catalyst by ball milling, but the maximal reduction temperature decreased in H2-temperature programmed reduction (TPR) analysis. Experimental observations with various concentrations of oxygen indicate that all catalysts showed a very low NOx conversion rate in the absence of oxygen and the reactivity of ball milled catalyst higher depending on the oxygen. It is occurred because the degree of participation of atmospheric oxygen and lattice oxygen is great than that of the not-milled catalyst.

수소 제거 촉매의 잠수함 수소제거기 적용 가능성 연구

김영희(Young Hee Kim),이인식(In Sik Lee),장두훈(Du Hun Jang),서필원(Phil Won Seo),최재욱(Jae Wook Choi) 한국정보기술학회 2022 한국정보기술학회논문지 Vol.20 No.12

In Korea, starting with the ship Dolphin(SSM-051) in 1983, energy sources are diesel engines and diesel submarines, which are batteries. A diesel submarine uses electricity generated from a diesel generator to charge a storage battery and uses the charged electricity to drive an electric motor connected to a propeller for propulsion.. The rechargeable battery used here uses a lead-acid battery, and the lead-acid battery generates hydrogen by electrolysis of an electrolyte through a chemical reaction during charging. In 2019, an explosion occurred on a tourist submarine, injuring three employees, and it was confirmed that the cause was an explosion caused by a hydrogen gas leak. The purpose of this study is to confirm the applicability of the hydrogen removal catalyst to satisfy the lower limit of the explosion of hydrogen gas generated during the operation of a tourist submarine or a military submarine that uses a diesel engine and battery as an energy source.