다양한 실리카원으로부터 합성된 ZSM-5 특성 연구

정순용(Soon Yong Jeong),이정민(Jung Min Lee),우훈희(Hoon Hee Woo),홍지숙(Ji Sook Hong),서정권(Jeong Kwon Suh),이관영(Kwan Young Lee) 한국공업화학회 2002 응용화학 Vol.6 No.1

ZSM-5 were synthesized from various silica source as silica sol, amorphous silica and water glass. The characterization for crystallinity and morphology of ZSM-5 has been carried out by means of X-ray diffraction and Scanning Electron Microscopy. From the result, XRD patterns of ZSM-5 synthesized form various silica source did not show difference. As shown in SEM images, ZSM-5 using silica sol was best.

인산 농도와 활성화 온도가 활성탄의 기공 구조에 미치는 영향

최정일 ( Jeong-il Choi ),진항교 ( Hangkyo Jin ),정순용 ( Soon-yong Jeong ),이정민 ( Jung-min Lee ) 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0

In this study, activated carbon was made by chemical activation process using phosphoric acid. The effects of activation temperature and phosphoric acid concentration on the pore structure of activated carbon were investigated. Activation temperature was 400 ~ 800°C and phosphoric acid concentration was 40-60 wt%. At the activation temperature of 600°C, specific surface area and total pore volume show minimum and external surface area shows maximum. As the concentration of phosphoric acid becomes stronger, the activation temperature which shows maximum external surface area becomes lower.

γ-Aminopropyltriethoxysilane 가 화학결합된 유기 충상 magadiite 의 제조

정은일(Eun Il Jeong),황윤형(Yoon Hyung Hwang),정순용(Soon Yong Jeong),이정민(Jung Min Lee),한명완(Myung Wan Han),박경원(Kyeong Won Park),권오윤(Oh Yun Kwon) 한국공업화학회 2002 응용화학 Vol.6 No.1

N/A

Vacuum Gas Oil 및 Carbazole 에 의해 코크화된 Co - Mo / γ- Al2O3 촉매의 활성저하에 대한 연구

정순용,진항교,김범식,이정민,서정권,하백현 ( Soon Yong Jeong,Hang Kyo Jin,Beom Sik Kim,Jung Min Lee,Jeong Kwon Suh,Baik Hyon Ha ) 한국공업화학회 1995 공업화학 Vol.6 No.2

A series of coked catalysts were prepared with Co-Mo/γ-Al₂O₃ hydrotreating catalyst by reacting with vacuum gas oil. The physical properties and catalytic activities of these coked catalysts were examined. A similar series of coked catalysts were prepared with carbazole added to vacuum gas oil, and the changes of physical properties and catalytic activities by nitrogen compounds were also examined. It was found that the amount of cake deposited on the surface of catalyst increases with increase of reaction temperature and reaction time. As amount of coke increases, pore volume and surface area decrease significantly. The order of reactivity of the fresh catalyst was: HDS > CNH > HYD > HDN. As the amount of coke increases, VGO-coked catalyst shows deactivation as order of HDN > CNH > HYD > HDS. Carbazole-coked catalyst shows much more deactivation in all reaction fuctionalities compared to the VGO-coked catalyst. Surface area and pore volume of carbazole-coked catalyst decrease much more than VGO-coked catalyst. These results can be explained as the severe plugging of pore mouth by the deposition of nitrogen compounds.

연속적인 결정화 방법에 의한 금속 지지체상에서 Zeolite - X 의 결정성장

박중환,서정권,정순용,이정민,도명기 ( Jeong Hwan Park,Jeong Kwon Suh,Soon Yong Jeong,Jung Min Lee,Myung Ki Doh ) 한국공업화학회 1997 공업화학 Vol.8 No.6

The films of zeolite X on the surface of metal sieve were prepared by continuous crystallization method. It is known that the growth of zeolite crystal on the surface of metal is mainly dependent on the surface composition of metal sieve. In the present work, the zeolite nuclei could be easily formed as Cr content on the metal surface was removed by acid treatment. In order to investigate the procedure growing of zeolite crystal by the continuous crystallization method, the composition of zeolite X(6.36Na₂O-Al₂O₃-5.3SiO₂-190.8H₂O) was supplied every 12hour. Then the mechanism and inter-relationship between the metal surface and nucleation are investigated. The results show that as the content of silica increases in the gel mixture, the nuclei of zeoilite are easily formed on the metal surface. Also, it was confirmed that the particle of zeolite stuck on the metal surface continues the linear growth. The particles are combined by the reaction of polycondensation, and finally become the shape of crystal. The sample synthesized by the film type was confirmed as zeolite X by the analyses of SEM and XRD.

알루미노 실리케이트 겔과 활성탄 혼합물상에서의 제올라이트 합성

박중환,서정권,정순용,이정민,도명기 ( Jeong Hwan Park,Jeong Kwon Suh,Soon Yong Jeong,Jung Min Lee,Myung Ki Doh ) 한국공업화학회 1998 공업화학 Vol.9 No.5

Water Glass 로부터 합성한 δ- Na2Si2O5 의 세제 보조제로서의 특성

최민정,전동원,서정권,정순용,이정민 ( Min Jeong Choi,Dong Won Jeon,Jeong Kwon Suh,Soon Yong Jeong,Jung Min Lee ) 한국공업화학회 1995 공업화학 Vol.6 No.1

The removal of Ca^(2+)and Mg^(2+) in simulated hardness water was carried out in order to investigate the feasibility as a detergent builder of synthesized δ-Na₂Si₂O_5 from water glass. Detergency performance was also examined when δ-Na₂Si₂O_5 was used as a detergent builder with surfactant. Results show that the removal capacities of Ca^(2+) and Mg^(2+) were 263㎎ CaCO₃/g and 202㎎ MgO/g at 25℃. As the concentration of Na^+ in simulated hardness water increases, the removal capacities of Ca^(2+) and Mg^(2+) decrease. The initial pH in simulated hardness water doesn`t affect the removal performance of Ca^(2+) and Mg^(2+). The final pH was 12 for the simulated hardness water including Ca^(2+), and was 10 for the simulated hardness water including Mg^(2+). As the amount of δ-Na₂Si₂O_5 as a detergent builder increases, detergency performance increases. The optimum amount of δ-Na₂Si₂O_5 is 0.8g/ℓ for LAS 0.4g/ℓ . At the beginning of washing process, δ-Na₂Si₂O_5 was deposited significantly on fabric, but was removed easily after rinsing process.

활성탄 지지체상에서 제올라이트 4A 합성 및 특성

박중환,서정권,정순용,이정민,도명기 ( Jeong Hwan Park,Jeong Kwon Suh,Soon Yong Jeong,Jung Min Lee,Myung Ki Doh ) 한국공업화학회 1997 공업화학 Vol.8 No.2

Zeolite 4A-impregnated complex molecular sieve was prepared by hydrothermal reaction after aluminosilicate gel was penetrated into the pore of activated carbon granule. The crystals of zeolite 4A mainly were formed in the macropore of activated carbon, and their average diameter is 0.8㎛. The pore volume of activated carbon granule is 0.67㎖/g, and the pore volume of the sample including 21.6wt% of zeolite 4A crystal is 0.41㎖/g decreasing the pore volume by 40% due to the crystallization of zeolite 4A crystals on the internal surface of activated carbon. The calcium ion exchange capacity of zeolite 4A-impregnated sample is 320mg CaCO₃/g zeolite, and this value is almost the same as that of zeolite 4A powder. The crystal of zeolite 4A was not separated from the support of activated carbon granule in the course of ultrasonic dispersion. The adsorption isotherm of water on zeolite 4A-impregnated sample shows the intermediate shape between types, I and III. In addition, zeolite 4A-impregnated sample shows thehydrophilic and hydrophobic properties simultaneously.

Water Glass 로부터 합성한 δ- Na2Si2O5 의 Ca2+ , Mg2+ 이온교환성

정순용,서정권,박중환,도명기,고재천,이정민 ( Soon Yong Jeong,Jong Kwon Suh,Jeong Hwan Park,Myung Ki Doh,Jae Cheon Koh,Jung Min Lee ) 한국공업화학회 1994 공업화학 Vol.5 No.3

The ion-exchange properties of Ca^(2+)and Mg^(2+) ions have been studied in δ-Na₂Si₂O_5 synthesized from water glass. Results show that optimum temperature for synthesis of δ-Na₂Si₂O_5 was 725℃ . Ion-exchange isotherms for Ca^(2+) and Mg^(2+) exchange for Na^+ in the synthetic δ-Na₂Si₂O_5 show that the ion-exchange capacity of magnesium is better than that of calcium, and the ion-exchange of magnesium is less sensitive for temperature than that of calcium. When initial pH of solution is increased between 2 and 6, the ion-exchange capacities of magnesium and calcium decrease a little. However, they are almost constant above pH 6 because of alkali buffer effect of δ-Na₂Si₂O_5. In the thermodynamic studies, it was found that Gibbs free energies of reaction of calcium ion-exchange are larger than those of magnesium ion-exchange with inverse order of selectivity. The standard enthalpy and entropy of reaction of calcium ion-exchange are larger than those of magnesium ion-exchange.

고체 상전이에 의한 결정성 층상 실리케이트의 합성

김종안(Kim Jong An),서정권(Suh Jeong Kwon),정순용(Jeong Soon Yong),이정민(Lee Jung Min),유승곤(Ryu Sung Kon) 한국공업화학회 1998 응용화학 Vol.2 No.2

Crystalline layered sodium silicate(δ-Na₂Si₂O_5) was synthesized by solid phase transition of anhydrous amorphous sodium silicate. The synthetic method was compared to the commercial method that is prepared by the spray drying of sodium silicate solution. From the results of TG/DTA and XRD analysis, the role of water in two hydration processes differs from each other. The Ca²+ ion exchange capacity of newly synthesized crystalline layered silicate was slightly increased compared to commercial method.