막촉매반응기를 이용한 수소생산

도시현,노지수,박호범 한국막학회 2018 멤브레인 Vol.28 No.5

본 총설은 분리막기술이 적용된 수소생산에 대한 개론으로, 특히, 암모니아를 수소운반체로 이용하는 수소생산에 대한 연구결과를 중점적으로 서술하였다. 암모니아를 수소운반체로 적용한 수소생산은 추가적인 탄소생성이 없다는 점 외에 여러 측면에 있어 이점이 있다. 많은 연구들이 고순도 수소 분리 및 생산을 위한 분리막 개발을 위해 진행되고 있으며, 이들 중 팔라듐을 기본으로 한 분리막(예를 들어, 다공성 세라믹 또는 다공성 금속 지지체와 팔라듐 합금의 얇은 선택층으로 이루어진 분리막)에 대한 연구가 활발하다. 반면에, 효율적인 암모니아 분해를 위해서는 주로 루테늄 촉매가 적용되고 있으며, 루테늄과 지지체 및 촉진제로 이루어진 루테늄에 기반을 둔 촉매에 대한 연구발표가 다수 존재한다. 수소생산을 위한 분리막 반응기 형태로는 충전층, 유동층, 그리고 마이크로반응기 등이 있으며, 이들의 최적화 및 원활한 물질전달 연구는 현재진행형 이다. 또한, 높은 암모니아 분해율, 고순도 수소생산 및 높은 수소생산율을 얻기 위해 분리막과 촉매의 다양한 조합에 대한 연구 및 분리막과 촉매의 역할을 동시에 구현할 수 있는 분리막에 대한 연구가 발표되고 있다. This review focused carbon-free hydrogen productions from ammonia decomposition including inorganic membranes, catalysts and the presently studied reactor configurations. It also contains general information about hydrogen productions from hydrocarbons as hydrogen carriers. A Pd-based membrane (e.g. a porous ceramic or porous metallic support with a thin selective layer of Pd alloy) shows its efficiency to produce the high purity hydrogen. Ru-based catalysts consisted of Ru, support, and promoter are the efficient catalysts for ammonia decomposition. Packed bed membrane reactor (PBMR), Fluidized bed membrane reactor (FBMR), and membrane micro-reactor have been studied mainly for the optimization and the improvement of mass transfer limitation. Various types of reactors, which contain various combinations of hydrogen-selective membranes (i.e. Pd-based membranes) and catalysts (i.e. Ru-based catalysts) including catalytic membrane reactor, have been studied for carbon-free hydrogen production to achieve high ammonia conversion and high hydrogen flux and purity.

태안기업도시 조성관련

현대도시개발(주) 한국건축시공학회 2008 한국건축시공학회지 Vol.8 No.2

지하저수지(ASR) 유입수 전처리기법 개발: 물리적 폐색 저하 및 수량공급원활을 위한 2 단계 급속여과지

박병주,도시현,홍성호 대한상하수도학회 2015 상하수도학회지 Vol.29 No.3

Two step rapid filter system as a pre-treatment for the injected water into aquifer storage and recovery (ASR) in Korea was developed to reduce physical blockage and secure the volume of the injected water. First, single rapid sand filters with three different media sizes (0.4~0.7, 0.7~1.0 and 1.0~1.4 mm) were tested. Only two sizes (0.4~0.7 and 0.7~1.0 mm) satisfied target turbidity, below 1.0 NTU. However, they showed the fast head loss. To prevent the fast head loss and secure the volume of the injected water, a rapid anthracite filter with roughing media size (2.0~3.4 mm) were installed before a single rapid sand filter. As results, both the target turbidity and reduction of head loss were achieved. It was determined that the media size for a rapid sand filter in two step rapid filter system (i.e. a rapid anthracite filter before a rapid sand filter) was 0.7~1.0 mm. In addition, the effects of coagulant doses on the removal of natural organic matter (NOM), which might cause a biological clogging, were preliminarily evaluated, and the values of UV254, dissolved organic carbon (DOC) and SUVA were interpreted.

과망간산칼륨을 이용한 용해성 망간 제거: 중탄산염 영향 및 최적조건

이용수,도시현,권영은,홍성호 대한상하수도학회 2016 상하수도학회지 Vol.30 No.2

This study is focused on manganese (Mn(II)) removal by potassium permanganate (KMnO4) in surface water. The effects of bicarbonate on Mn(II) indicated that bicarbonate could remove Mn(II), but it was not effectively. When 0.5 mg/L of Mn(II) was dissolved in tap water, the addition of KMnO4 as much as KMnO4 to Mn(II) ratio is 0.67 satisfied the drinking water regulation for Mn (i.e. 0.05 mg/L), and the main mechanism was oxidation. On the other hand, when the same Mn(II) concentration was dissolved in surface water, the addition of KMnO4, which was the molar ratio of KMnO4/Mn(II) ranged 0.67 to 0.84 was needed for the regulation satisfaction, and the dominant mechanisms were both oxidation and adsorption. Unlike Mn(II) in tap water, the increasing the reaction time increased Mn(II) removal when KMnO4 was overdosed. Finally, the optimum conditions for the removals of 0.5 - 2.0 mg/L Mn(II) in surface water were both KMnO4 to Mn(II) ratio is 0.67 - 0.84 and the reaction time of 15 min. This indicated that the addition of KMnO4 was the one of convenient and effective methods to remove Mn(II).

Scalable production of few-layer graphene flakes by temperature-controlled shear exfoliation in organic solvent

정재구,도시현,박호범 한국공업화학회 2022 한국공업화학회 연구논문 초록집 Vol.2022 No.-

비소와 철 동시제거를 위한 Fe-GAC와 GAC로 충진된 컬럼

이용수,도시현,홍성호 대한상하수도학회 2016 상하수도학회지 Vol.30 No.1

First of all, Fe or/and Mn immobilized granular activated carbons (Fe-GAC, Mn-GAC, (Fe, Mn)-GAC) were synthesized and tested to remove arsenate (As(V)). The results in batch test indicated that Fe-GAC removed As(V) effectively, even though the surface area of Fe-GAC was reduced largely. Moreover, adsorption isotherm test indicated that the experimental data fit well with Langmuir model and the maximum adsorption capacity (qmax) of Fe-GAC for As(V) was 3.49 mg g-1, which was higher than GAC (2.24 mg g-1). In column test, the simulated water, which consisted of As(V), Fe(III), Mn(II) and Ca(II) in tap water, was used. Fe-GAC column with 1 hr of pre-washing time treated As(V) effectively while GAC column removed Fe(III) better than Fe-GAC column. Moreover, the increasing pre-washing time from 1 to 9 hour in Fe-GAC column enhanced Fe(III) removal with little negative impact of As(V) removal. Mostly, the column filled with Fe-GAC and GAC (i.e. the mass ratio of Fe-GAC:GAC = 2:8) showed the higher treatability of both As(V) and Fe(III), even it operated with 1 hr pre-washing time.

고도정수처리용 Filter/Adsorber Granular Activated Carbon 특성 평가: 마모지수, floater, water-soluble ash 및 흡착특성 평가

박병주,도시현,김태양,홍성호 대한상하수도학회 2016 상하수도학회지 Vol.30 No.1

The characteristics of filter/adsorber granular activated carbon (F/A GAC) were investigated by measuring various parameters, which include surface area, pore volume, abrasion number, floater, and water-soluble ash. The correlation between parameters was also evaluated. Moreover, rapid small-scale column test (RSSCT) was conducted for adsorption characteristics. Thirteen F/A GAC were tested, and the average values of abrasion number and water-soluble ash were 88.9 and 0.15%, respectively. F/A GAC with the larger external surface area and greater mesopore volume had the lower abrasion number, which indicated that it was worn out relatively easily. Water-soluble ash of coconut-based GAC (about 2.6%) was greater than that of coal-based GAC (less than 1%), and the pH of solution was increased with GAC, which had the higher water-soluble ash. On the other hand, floater of thirteen F/A GAC was divided as two groups, which one group had relatively higher floater (2.7~3.5%) and the other group had lower floater (approximately 0.5%). The results of RSSCT indicated that coconut-based GAC (i.e. relatively higher water-soluble ash) had less adsorption capacity. Moreover, adsorption capacity of coal-based GAC with larger surface area and greater mesopore volume was superior to others.

철-망간 산화물 고체상에서 Ca 공존 유무에 따른 우라늄 수착 거동 영향 연구

박태진,도시현,백민훈 한국방사성폐기물학회 2015 한국방사성폐기물학회 학술논문요약집 Vol.2015 No.10

Physicochemical properties of nano-pore adsorbents to remove volatile organic compounds in aqueous phase

권용재,도시현,공성호 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.4

The nano-pore adsorbents, which were waste-reclaimed (WR), shale-based (S), red clay-based (R), and blue kaolin-based (B), were investigated for their physicochemical characteristics to remove benzene, toluene, ethylbenzene and xylene (BTEX). The BET and SEM-EDS analysis showed that WR, which was a mixture of bottom ashes from a power plant and dredged soil, had the larger surface area (i.e. 14.56 m2 g-1), the rougher surface topography, and the higher total iron (i.e. 5.46 wt% of Fe) than others. Moreover, the XRD analysis indicated that all adsorbents contained aluminum-silica complexes and particularly, both S and WR also contained the iron complexes. The iron complex on S was identified as hercynite (FeAl2O4) while two types of iron oxides (i.e. hematite (α-Fe2O3) and maghemite (γ-Fe2O3)) existed on the surface of WR. Langmuir model generally predicted BTEX adsorption on nano-pore adsorbents and the calculated adsorption capacities (Q0) of WR for BTEX were 0.752, 3.793, 1.678, and 4.902 mg g-1, respectively. In addition, the more BTEX was removed in H2O2/WR system than others. This relatively high BTEX removal by H2O2/WR could be explained by both the larger surface area and catalytic property, which was mainly from the coexistence of hematite and maghemite. Moreover, even though S had hercynite, it did not show much catalytic properties to degrade BTEX in solution.

MOF의 결함 제어를 이용한 CO2 분리용 고성능 나노복합막의 제조

이태훈,도시현,박호범 한국막학회 2019 한국막학회 총회 및 학술발표회 Vol.2019 No.11