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RISS 인기검색어
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- 저자 : 박재구 ( Jae Koo Park ) (검색결과 4 건)
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반암(맥반석)으로 제조한 다공성 펠렛의 Ag 담지 및 항균 메디아로서의 적용
한요셉,김현중,신영섭,박재구,고재철,Han, Yo-Sep,Kim, Hyun-Jung,Shin, Young-Seop,Park, Jai-Koo,Ko, Jae-Churl 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1
The porous pellets were prepared from porphyry by slurry foaming method. The effect of sintering temperatures on pore structure of porous porphyry pellets with different extension ratio ($E_R$) was investigated by specific surface area, water absorption and porosity, which changed with sintering temperatures. When the sintering temperatures increased from $975^{\circ}C$ to $1075^{\circ}C$, specific surface area and water absorption of the all samples decreased. In case of the sample with an equal sintering temperature, $E_R=3.0$ pellets had little influence on pore structure compared to the $E_R=2.0$ pellets. As a results, it was shown by SEM that facilitated formation of micro pores at $E_R=2.0$ pellets shrunk increasingly after sintering process. At $E_R=3.0$ and sintering temperature at $1025^{\circ}C$, optimum conditions of the porous porphyry porous pellets was found. Also, Escherichia coli removal efficiency of the silver-containing porphoyry porous pellets was measured for the feasibility as a antibacterial media. The antibacterial activity of prepared silver-containing sample was maintained above 90% for 40 days.
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이승인,박재구,정재화 한양대학교 환경공학연구소 2000 環境科學論文集 Vol.21 No.-
슬러리발포 및 겔캐스팅법을 이용하여 세라믹 다공체를 제조하였다. 또한, 이를 분진제거용 여과재로 응용하기 위해 기공구조 및 공기 투과율에 관한 연구를 실시하였다. 기공률은 80% 정도이며, 100㎛와 200㎛, 두 종류의 기공크기를 갖는 다공체를 제조하였다. 기공들은 창(window)을 통해 연결된 연속성 기공구조를 갖는다. 미세분진을 제거하기 위해, 다공체의 한쪽 면은 표면여과층을 형성하였으며, 기공크기는 10 ㎛이하이다. 기공크기가 200㎛인 다공성지지체의 경우, 900∼1000×10-13 ㎥의 투과율은 나타내었으며,기공크기가 100㎛인 지지체의 투과율은 600∼700 × 10-13 ㎥로 각각 측정되었다. 표면여과층이 형성된 여과재의 투과율은 약 200 × 10-13 ㎥로서 지지체의 기공크기에 관계없이 거의 일정한 값을 나타냈다. 또한, Flyash 분진을 이용하여 측정한 여과재의 집진효율은 99.9% 이상인 것으로 나타났다. This study was carried out to evaluate the pore structure and air permeability of the foam ceramic filter prepared by using foam method. Two different types of agents, Benzethonium chloride(C27H42NO2Cl) and Sodium Lauryl Sulfate(CH3(CH2)11OSO3Na) were used for foaming slurry. Porosity of foam ceramics was about 80 % and pore sizes were differed as 200 and 100 ㎛ respectively according to types of agents. It was observed that foam ceramics had continuous pore structure that pores were connected each other by small pathways called windows. For collecting dust, one side of foam ceramic support was coated with fine particles that the size was 20∼50 ㎛. Pore size of the coating layer was under 10 ㎛. Permeability of foam ceramics is proportional to pore size. But coated ceramic filters have similar values without regard to pore size of supports. The permeability of supports was varied with pore size in the range of 600 × 10-13 ㎥ to 1000 × 10-13 ㎥. And for the case of the coated ceramic filter, it was about 200 × 10-13 ㎥. As a result of dust collection test with fly ash, the particle removal efficiency for the oeramic filter specimen was estimated over the 99.9%.
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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.
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