Addition of V2O5-MnO2/USY-zeolite catalyst in PTFE fiber for bag filter and its catalytic activity tests for NH3-SCR at low-temperature

Jin Ho Boo,Eunseok Kim,Byung Chan Kwon,Myung Jo Seo,Ji Man Kim,Ji Bong Joo,Dohyung Kang,No-Kuk Park 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-

This study investigated the catalytic activity of vanadium-manganese supported on USY-zeolite as a catalystfor low-temperature NO removal, and embedded the powder catalyst in PTFE filter of bag filter. TheV2O5-MnO2/USY-zeolite catalyst was prepared using the co-impregnation method, and the V2O5/MnO2ratio was 0/10, 2.5/7.5, 5/5, 7.5/2.5, or 10/0. The catalytic activity test for NH3-SCR(selective catalyticreduction) of NO was performed at 150–230 C. An enhanced NO conversion above 60% was exhibitedin the low-temperature region below 230 C, and the NO removal efficiency increased as the MnO2 contentincreased. The NH3-TPD and NO-TPD(Temperature Programmed Desorption) analysis confirmed thatthe NH3 adsorption of the catalyst more significantly influences the NO removal performance than the NOadsorption. As the MnO2 content on the catalysts increased, the strength and amount of adsorbed NH3increased, resulting in enhanced NO conversion. The catalyst-embedded PTFE (polytetrafluoroethylene)fiber was prepared by extruding physically mixed PTFE and catalyst powder. Scanning electron microscopy/energy dispersive X-ray spectroscopy confirmed that the catalyst was well dispersed on the surfaceand inside the PTFE fiber. The NO removal performance of the catalyst included PTFE fiber increased asthe amount of the catalysts added was increased.

고온에서 황화수소 제거를 위한 Fe₂O₃탈황제의 반응성

박노국,김장희,이태진 嶺南大學校 環境問題硏究所 1994 環境硏究 Vol.14 No.1

석탄가스화의 고온건식탈황제 개발을 목적으로 철계 탈황제를 선정하여 Fe₂O₃의 함량을 61.8%, 30.0% 그리고 10.0%로 변화시킨 3종류의 탈황제에 대하여 탈황 및 재생반응을 조사하였다. 먼저 H₂S의 제거효율이 가장 최적인 반응온도를 찾기 위하여 출구에서의 농도변화를 GC-TCD로 분석하였으며, SEM 사진 분석결과 최적의 H₂S 제거효율을 나타내는 온도는 500℃로 나타났다. 탈황-재생반응을 반복적으로 수행하였으며, 황화반응은 H₂S와 (H₂+ CO + CO₂+ N₂)의 혼합가스를 사용하여 500℃에서, 재생반응은 O₂-N₂의 혼합가스로 800℃에서 각각 수행하였다. Fresh한 탈황제, 황화반응 및 재생반응 후의 탈황제 SEM사진과 XRD 특성도 비교 조사하였다. 그리고 반응기 출구에서 H₂S 농도의 파과곡선으로부터 탈황제의 성능을 비교하였다. Several Fe₂O₃sorbents were investigated as regenerable sorbents for the removal of H₂S at high temperature. To find optimal temperature of the reaction between H₂S gas and Fe₂O₃sorbent, the effluent gas from a fixed-bed reactor was analysed by GC-TCD. The experimental results showed that H₂S removal efficiency of sorbent was optimum at 500℃ and SEM data were in accordance with this feature. The sorbents were subjected to successive sulfidation-regeneration cycles. Sulfidation was carried out at 500℃ with H₂S-(H₂+CO+CO+N₂)mixtures, regeneration with O₂-N₂mixtures. Fresh, sulfided, and regenerated sorbents were characterized by SEM and XRD. Breakthrough exit concentration of H₂S is discussed in term of physical structure of the sorbents.

탄산칼슘의 고온건식 탈황반응성 연구

박노국,유성구,서길수,이태진 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.2

The sulfidation reaction of calcium carbonate to remove H2S were investigated. Expecially, the effect of polymorphs of calcium carbonate and reaction temperature on the sulfur capture were determined. It was found that calcination reaction of calcium carbonate were influenced by polymorphs of calcium carbonate. The calcination temperatures of aragonite were lower than those of other calcium carbonates. For the sulfidation of calcite with H2S, the effect of reaction temperature on the sulfur capture were not found. But in caes of vaterite and aragonite, the reaction temperature were found to have a significant effect on the sulfidation reaction. From in these results, optimum temperatures of sulfidation reaction using vaterite and aragonite were determined at 800∼850℃ and 750℃, respectively.

아연계 탈황제의 장기연속 반응성 연구

박노국,이종욱,이승철,이종대,류시옥,이태진 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.2

The zinc titanate sorbents(ZTG40) were prepared and the tests for durability and attrition resistance were carried out to develop the highly effective desulfurization sorbents. In the attrition tests for ZTG40 the results showed that the attrition resistance was 94.08% and that the sulfur capacity was maintained above 15g S/100g sorbent throughout the 100-cycle test, its maximum being 23.05g S/100g sorbent. As compared to sorbents developed by the developed countries, ZTG40 showed superior performances. In the advanced countries 15g S/100g sorbent is a yardstick of excellency for the sulfur capacity of desulfurization sorbents. Therefore, ZTG40 developed in this study has the desirable physical and chemical properties for fluidized desulfurization of coal gases.

천연제올라이트를 지지체로 사용한 고온건식 아연계 탈황제의 반응특성 연구

박노국,정용길,이종대,이태진,김재창 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.5

고온건식 탈황제의 지지체로 알루미나와 천연제올라이트를 사용하여 아연계 탈황제를 제조하였으며 성능을 조사하였다. 두 가지 탈황제의 반응특성실험은 480℃/580℃(황화/재생온도)에서 칸 밸런스와 고정층 반응장치로 반응속도와 황수용능력을 비교하였으며 내마모 실험장치를 이용하여 탈황제의 내마모도를 조사하였다. 두 탈황제의 성능 실험결과 천연제올라이트를 지지체로 사용한 탈황제의 초기 황화반응속도가 알루미나를 지지체로 사용한 탈황제보다 빨라졌으며, 10 cycle에서 황수용능력이 20 gS/100 g sorbent 이상 유지되었다. 내마모성은 AI(마모지표)값이 14.7%정도였다. 본 연구에서는 천연제올라이트의 고온건식 탈황제의 지지체로 적용 가능성을 확인하였다. Two types of zinc-based sorbents using alumina and natural zeolite as the supports for hot-gas desulfurization were prepared, and investigated their desulfurization capability. Their reaction rate and sulfur capacity were compared by Cahn balance and over the fixed bed reactor system at 480℃/580℃ (sulfidation/regeneration). The attrition resistance was measured by ASTM methd. Thc initial sulfidation rate of ZnO/natural zeolite sorbent was higher than that of ZnO/alumina, and the sulfur capacity of ZnO/natural zeolite sorbent was maintained above 20 gS/l00 g sorbent for 10 cycles. A attrition index was 14.7%. The use of natural zeolite as a support of sorbents may be possible for hot gas desulfurization.

CO/CO_2혼합 gas를 이용한 산화텅스텐(WO_3) 환원-탄화 반응에 관한 연구

박영효,이종대,박노국,이태진 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.1

The reduction-carburization of tungsten oxide(WO_3) with CO/CO_2 mixtures was studied. The reduction rate was increased with the concentration of CO. The final products at 1100℃ were WC(CO concentration: 90∼100 vol%), W (CO concentration: 85 vol%) and WO_2 (C0 concentration: 70 vol%). For the CO concentration of 100 vol%, the general reaction routes were WO_3 → W_20O_58 → W_18O_49 → WC (reaction temperature: ­600℃), WO_3 → W_20O_58 → W_18O_49 → WO_2 → WC (reaction temperature: 600∼800℃) and WO_3 → W_20O_58 → W_18O_49 → WO_2 → W → WC (reaction temperature: +900℃).

Zinc Titanate에서 H₂S 흡수특성 조사

이태진,박노국,권원태,장원철,박영성 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.16 No.1

요약문사출성형법으로 평가를 위해 ZnO 함량을 변화시키면서 4종류의 Zinc Titanate 흡수제를 제조하였다. Zn/Ti 몰비가 증가할수록 지배적인 결정상은 Zn 2Ti3O8과 Zn2TiO4로 관찰되었다. Zinc Titanate 탈황제에 의한 H2S 흡수반응을 모사석탄가스의 고온탈황에 의해서 실험적으로 연구하였다. 내경 3cm인 석영관의 고정상 반응기로 4종류의 Zin cTitanate 흡수제에 대하여 H2S 흡수와 재생의 10-cycle 실험을 수행하였다. 파과곡선, SEM, BET 등의 실험적인 관찰을 근거로 하여 650℃가 최적 흡수반응온도임을 결정하였다. 탈황과 재생의 반복적인 실험동안 H2S와 S02의 파과곡선들을 구하였다. 또한, 시험 전후의 흡수제의 물성변화를 SEM, EDX, Hg-porosimetry 및 BET 방법으로 분석하였다. 비록 더많은 연구가 필요하지만, 제한된 실험적 조건에서 판단하면 YZT-3(Zn/Ti=1.5)가 가장 우수한 탈황제라고 결론내릴 수 있다.AbstractFour zinc titanate sorbents were prepared for evaluation by extrusion method with varying ZnO contents. The predominant crystalline phases were Zn2Ti3O3 and Zn2TiO4 as Zn/Ti molar ratio was increased. Absorption of HzS by the zinc titanate sorbents was studied experimentally in high temperature desulfurization of simulated coal gas. Fixed-bed system of 3 cm i. d. quartz tube was used to carry out 10-cycle experiments of H2S absorption and regeneration for the zinc titanate sorbents. In these experiments the optimal absorption temperature was determined as 650 ℃ based on experimental observation of breakthrough curves, SEM and BET results, and so on. H2S and SO; breakthrough curves were obtained for each sorbent during repetitive cycles of desulfurization and regeneration. Also, property changes of the sorbent before and after testing were analyzed using SEM, EDX, XRD, Hg-porosimeter and BET method. It is concluded under this limited experimental conditions YZT-3 (Zn/Ti =1.5) was the most suitable desulfurization sorbent even though further tests are required.

금속담지 촉매를 이용한 아세틸렌의 삼합체 고리화 반응

정용화,박노국,김기석,이태진 한국공업화학회 2003 응용화학 Vol.7 No.2

Cyclotrimerization of acetylene to benzene was investigated on Pd/titania as a means to utilize acetylene as the feedstock for synthesis of valuable hydrocarbons. Literature indicated Pd and titania posses the activity for the reaction with relation to the density of Pd (111) plane and reduced titanium ions. Study of catalytic activity, product selectivity, and catalyst stability under varying catalyst specification and reaction condition has to be further conducted to develop a competitive process for the reaction. Our research investigated the effect of Pd loading, additional metal oxide, and reduction treatment upon the catalytic behavior of Pd/titania for the reaction in the laboratory scale.

소결체 Scrap으로부터 Co 회수

이종대,이종욱,박노국,박영효,이태진 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1

The recovery of Cobalt(Co) and Tungsten Carbide(WC) from refractory scrap using electrolysis in an acid solution is studied. The method of electrochemical decomposition is a simple and economical process. The most important factor in the process of electrochemical decomposition is the component and concentration of electrolyte. The results show that the decomposition yield in sulfuric acid is better than other acid. This method is applicable for industrial process, because the decomposition yield is increased as scrap weight.

WO_3의 환원-탄화에 있어서 Zeolite NaX, HX, KX의 특성에 따른 영향

이동활,이종대,박영효,박노국,이태진 한국공업화학회 2003 응용화학 Vol.7 No.1

The effect of the Zeolite HX,NaX, and KH prepared by ion-exchange method, on the reduction-carburization of WO_3 was studied This study was performed at thetemperature range from 300℃ to 735 ℃ with CO gas. The produced gas, CO_2, was analyzed by mass spectroscopt The addition of the Zeolite HX, NaX,and KX into WO_3 increased the efficiency of the reduction-carburization of WO_3 and Zeolite HX with the strongest acidity was the most effective on redution-carburization among them. The Zeolite HX, NaX, and KX improved the oxygen mobility of WO_3 and the acidity of the Zeolite was directly related to the increasing efficiency of reduction-carbuization of WO_3.