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V₂O_(5)-TiO₂촉매 담지된 세라믹 폼 필터를 이용한 NOx 제거 특성
한요섭,김현중,박재구 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.6
Ceramic foams prepared from silica -day were coated with T1O₂ and V₂O5 catalysts for selective catalytic reduction of NOx with NH₃, The effects of V₂O5 loading, reaction temperature, space velocity, and oxygen content on NOx reduction with NH₃ were mainly investigated Also, the NOx reduction characteristics of V₂O5 and V₂O5 -T1O₂ filters were compared when sulfur dioxide exists From the results, the optimal NOx reduction with the maximum reduction efficiency of 91 % could be performed under the condition with V₂O5 loading 6 .0 wt %, reaction temperature 35.0℃, space velocity 6,000h^-1 and oxygen content 5% And, the V₂O_(5)-TO₂ filters have shown higher NOx reduction efficiency and acid resistance against sulfur dioxide than the VO_(5) filters
질소산화물 제거를 위한 V₂O_5/TiO₂촉매 코팅된 다공성 실리카 필터의 제조 및 특성
한요섭,고재철,박영구,김승호,박재구 三陟大學校 2005 論文集 Vol.38 No.-
The prepared porous support from silica coated with TiO₂ and V₂O_(5) catalysts were studied by selective catalytic reduction of NOx with NH₃ The effects of V₂O_(5) loading, reaction temperature, space velocity and filter-type(disk and sphere) on the characteristics of NOx reduction with NH₃ were mainly investigated. At space velocity 6000h^(-1), reaction temp rature 350℃, V₂O_(5) loading 6.Owt.% and oxygen content 5%, the NOx reduction was higher to about 91%. The efficiency of porous silica on V₂O_(5)/TiO₂ catalytic disk-filter was higher than that of the V₂O_(5)/TiO₂ catalytic sphere-filter. It has been experimentally observed that the V₂O_(5)/TiO₂ catalytic disk-filter has strong resistance of gas flow.
다공성 실리카 지지체 제조 및 Sol-Gel법에 의한 TiO<sub>2</sub>코팅
한요섭,박재구 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.7
슬러리 발포법을 이용하여 다공성 실리카 지지체를 제조하였으며, 지지체 표면에 졸-겔법을 이용하여 TiO$_2$을 코팅하였다. TiO$_2$ 코팅층에 대한 XRD, SEM 및 BET 측정 결과, 열처리 온도가 50$0^{\circ}C$에서 TiO$_2$의 anatase 결정상이 나타나기 시작하여, $700^{\circ}C$에서 그 피크가 최대가 되었다. 이 때 결정 성장한 TiO$_2$ 입자의 크기는 약 1$mu extrm{m}$ 정도로 판명되었다. 또한, 촉매지지체로 활용성을 검토하기 위해 TiO$_2$코팅 전후로 지지체의 굽힘 강도와 기체 투과율을 측정하였다. 강도의 경우, 코팅 전 2.4 MPa에서 이후 3.9∼4.3MPa로 증가하였으나 열처리 온도의 영향에 의한 변화는 나타나지 않았다. 한편, 투과율은 코팅 전 770${\times}$$10^{-13}$ $m^2$에서 코팅 후 363${\times}$$10^{-13}$ $m^2$로 감소하였고 열처리 온도의 증가와 함께 감소하는 것으로 나타났다. A sol-gel method was applied to coat TiO$_2$ on porous silica prepared using slurry foaming method from silica. from the results of XRD, SEM, and BET, the anatase phase was firstly observed at the coated supports with the heated of 50$0^{\circ}C$. The coated supports with the heated of $700^{\circ}C$ had the maximum anatase peak, and the particle size of coated TiO$_2$ was about 1 ${\mu}{\textrm}{m}$. Bending strength and gas permeability of the porous silica were measured for the feasibility as a catalytic supports. In case of the uncoated porous materials with the strength of 2.4 MPa, the strength increased to 3.9∼4.3 MPa after the coating process regardless of the heating temperature. On the other hand, the permeability of the uncoated porous materials decreased from 770${\times}$10$^{-13}$ $m^2$ to 363${\times}$10$^{-13}$ $m^2$ after the coating process, and it decreased with the increasing heating temperature.
주조용 B390 알루미늄합금의 조직과 기계적 성질에 대한 각종 주조법의 영향
한요섭,이호인,김성수,김정식 ( Yo Sub Han,Ho In Lee,Sung Su Kim,Jung Sik Kim ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.3
N/A The effects of casting processes-direct and indirect squeeze casting, permanent mold casting and die casting on the microstructure and mechanical properties were studied for the hypereutectic B390 aluminium alloy. The effects of T5 and T6 heat treatment were also examined. The direct and indirect squeeze casting showed no casting defects such as porosity and shrinkage were observed in permanent mold castings and die castings. The primary silicon phase was refined and homogeneously distributed in the order of indirect squeeze casting, deicasting, direct squeeze casting and permanent mold casting. Depletion of primary silicon phase in die casting surface was disappeared in indirect squeeze casting. Tensile strength of cast and heat treated specimens were increased in the order of direct squeeze casting, permanent mold casting, indirect squeeze casting and die casting. Hardness of indirect squeeze castings was larger than that of other castings. As indirect squeeze casting of B390 aluminium alloy, the time of T6 heat treatment to achieve high strength can be reduced.
Al-Si 이원계 합금의 응고현상에 미치는 정수압의 영향 (2) - 응고 열해석적 연구 -
한요섭,김도향,이호인 ( Y . S . Han,D . H . Kim,H . I . Lee ) 한국주조공학회 1986 한국주조공학회지 Vol.6 No.3
The computer simulation of squeeze casting of Al-Si binary alloys were studied by modelling of solidification and calculating of temperature changes of the mould and casting in comparison with gravity casting. The calculated interface heat transfer coefficients at the mould/cast in gravity casting were 0.055, 0.022 and 0.017㎈/sec ㎠ ℃ for hypoeutectic, neareutectic and hypereutectic Al-Si alloy, respectively. These are due to different behaviour of the formation of air gab that affected from growth morphology and thermal conductivity of constituted phases. As squeeze casting, The calculated values were 0.6, 0.3 and 0.15㎈/sec ㎠ ℃ for hypoeutectic, neareutectic and hypereutectic Al-Si alloy, respectively. Pressurization made remarkably improved the contact condition between the mould and casting as eliminated air gab. It resulted in increasing of interface heat transfer coefficient by one order magnitude or more as pressurized. The critical transition value of interface heat transfer coefficient from gravity casing to squeeze casting on Al-Si binary alloys was 0.06㎈/㎠ sec ℃.
Al-Si 이원계 합금의 응고현상에 미치는 정수압의 영향 (1) - 금속 조직적 연구 -
한요섭,김도향,이호인 ( Y . S . Han,D . H . Kim,H . I . Lee ) 한국주조공학회 1986 한국주조공학회지 Vol.6 No.2
The effects of pressure during solidification on macro-and micro-structures have been studied in pure aluminium and Al-Si alloys. The application of pressure during solidifcation accelerated both equiaxed and columnar dendritic-growth due to stimulating of equiaxed survival and faster preferential growth of primary dendrites against the parallel direction of heat flow. Burden-Hunt model was modified to express the significant changes of CET behaviours under pressure. A further point to be noted was that greatly fine eutectic silicon flakes (0.5×13㎛) with the decrease of halo layers (7㎛) of aluminium riched phases in the periphery of primary silicon particles were observed when pressure was applied during solidification.