크롬 및 구리가 담지된 La2O3 / Al2O3 계 복합산화물 촉매의 구조 및 열안정성

서정권,하백현 ( Jeong Kwon Suh,Baik Hyon Ha ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.6

The structure and thermal properties of Cr and Cu added La₂O₃/Al₂O₃ system were investigated using XRD, BET, ESCA, TEM and DTA. During calcination the addition of chromium retarded the phase transition of La-β-Al₂O₃ and improved the thermal stability of La₂O₃/Al₂O₃ system at highly temperature. However the addition of copper on La₂O₃/Al₂O₃ system accelerated the phase transition of support. The surface area after being calcined at 1,200℃ for 2 hours was 40 ㎡/g for (Cr₂O₃) (La₂O₃) (Al₂O₃)_(19) oxide and 10 ㎡/g for (CuO)(La₂O₃)(Al₂O₃)_(19) oxide. The sintering of La₂O₃/Al₂O₃ system at 1,000℃ proceeded via surface diffusion and was not influenced by the Cr addition. The sintering of Cu added La₂O₃/Al₂O₃ system proceeded via viscous flow. The activation energy of the phase transition above 1,200℃ had a constant value about 600 kJ/㏖, regardless of the Cr and Cu addition.

전이 금속 산화물이 담지된 La / Al 복합산화물 촉매상에서의 메탄 연소반응

서정권,하백현,고재천,이정민 ( Jeong Kwon Suh,Baik Hyon Ha,Jae Cheon Koh,Jung Min Lee ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.6

Combustion catalysts were prepared by the impregnation of transition metal oxide on La/Al oxide(Al₂O₃/La₂O₃=19), and then calcined in air. Methane combustion was carried out using these catalysts. X-ray diffraction analysis indicates that La/Al oxide was crystallized from amorphous form into La-β-Al₂O₃ phase above 1200℃. Crystallization was accelerated by the addition of copper on La/Al oxide, but it was retarded by the addition of chromium on La/Al oxide. The copper content of the surface of CuO-La/Al oxide decreased as the calcination temperature increased. This result indicates the formation of solid solution. In case of Cr₂O₃-La/Al oxide, Cr₂O₃mainly existed on the catalyst surface. The activities of catalysts calcined at 1200℃ appeared as the following order; CuO, Cr₂O₃>Fe₂O₃>MnO>CoO>NiO. The catalytic activity of CuO-La/Al oxide decreased as the calcination temperature increased. However the catalytic activity of Cr₂O₃-La/Al oxide was still maintained after calcination at 1400℃.

제올라이트 X/활성탄 복합체의 H2O 흡착 특성연구

서정권 ( Jeong Kwon Suh ),홍지숙 ( Ji Sook Hong ),이창하 ( Chang Ha Lee ),이정민 ( Jung Min Lee ) 한국공업화학회 2003 공업화학 Vol.14 No.2

왕겨를 출발 원료로 하여 제올라이트 X/활성탄 복합체(제오카본)를 합성하였으며, 합성된 복합체와 제올라이트 13X애 대한 H_2O의 흡착 특성을 비교 하였다. 실천을 통해 얻어진 흡착 등온선에 Langmuir-Freundlict, Muilt-BET 및 Excess suface Work (ESW) 모델을 적용 시켰다. 결과에서 알수 있듯이, 제오카본의 경우에는 Langmuir-Freundlich 모델을 적용했을 경우에는 313.15 K (1.39%), Multi-BET 모델의 경우에는 313.15 K (2.29%), ESW 모델 적응시는 353.15 K (0.47%) 온도에서 가장 작은 오차를 보여주었다. 제올라이트 13X외 경우에는 Langmuir-Freundlich 모델을 적용했을 경우에는 353.15 K (0.10%), Multi-BET 모델의 경우에는 313.15 K (0.65%), ESW 모델 적용시는 353.15 K (0.68%) 온도에서 가장 작은 오차를 보여주었다. 특히, ESW 모델은 Langmuir-Freuntdlich Mulit-BET model에 비해서 저압영역에서는 단분자충 흡착과 고압 영역에서는 capillary condensation 현상 등이 고려된 결과, 모든 온도와 압력 범위에서 잘 적용되었다. Zeolite X/activated carbon composite (zeocarbon) was synthesized from rice hulls. The adsorption equilibrium of H_2O on zeocarbon was compared with that of zeolite 13X, Langmuir-Freundlich, Excess Surface Work (ESW) and Multi-BET isotherm models were used to fit the experimental data of H_2O adsorption on zeocarbon and zeolite 13X. In the case of zeocarbon, the minimum error of 1.39% resulted when the Langmuir-Freundlich model was applied at 313.15 K. In the cases of Multi-BET and ESW models, the minimum errors were 2.29% and 0.47% at 131.15 K and 353.15 K, respectively. In the case of zeolite 13X, the minimum error was 0.10% at 0.68%, at 313.15 K and 353.15 K, respectively. ESW model was found to be in better agreement with the experimental values than Langmuir-Freundlich model or Multi-BET model. Considering that monolayer adsorption occurs in low-pressure region, while the capillary condensation phenomenon prevails in high-pressure region, ESW model fitted well under all the temperature and pressure conditions.

리튬 2차전지용 양극활물질의 제조에 관한 연구

서정권(Suh Jeong Kwon) 한국열환경공학회 2009 한국열환경공학회 학술대회지 Vol.2009 No.춘계

SMB 공정 p-Xylene 생산을 위한 SMB 공정 및 흡착제

서정권 ( Jeong Kwon Suh ),김범식 ( Beom Sik Kim ),이진석 ( Jin Suk Lee ),이영섭 ( Young Sub Lee ),이창하 ( Chang Ha Lee ) 한국공업화학회 2007 공업화학전망 Vol.10 No.6

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

Water glass로부터 δ-Na₂Si₂O_5를 합성하여, 이의 칼슘과 마그네슘의 이온교환성, 이온교환에 대한 열역학적 특성치를 조사하였다. Water glass로부터 합성한 δ-Na₂Si₂O_5의 최적 합성온도가 725℃ 근처임을 알았다. 이온교환반응에 있어서 마그네슘 이온교환능이 칼슘 이온교환능보다 우수하였고, 마그네슘의 이온교환능은 온도에 민감하지 않은 반면에, 칼슘의 이온교환능은 온도에 민감하여 온도증가에 따라 이온교환능의 증가폭이 큼을 알 수 있었다. 초기 수용액 pH 변화에 따른 칼슘과 마그네슘의 이온교환능은 초기 수용액 pH가 2∼6 사이에서 약간 감소하였으나, 6 이상에서는 δ-Na₂Si₂O_5의 알카리 완충효과 때문에 각각 일정하게 나타났다. 이온교환 Gibbs 자유에너지는 이온교환 선택성의 역순으로 칼슘 이온교환반응이 마그네슘 이온교환반응보다 높게 나타났으며, 엔탈피와 엔트로피값도 칼슘 이온교환반응이 마그네슘 이온교환 반응보다 높게 나타났다. 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.

Fe₂O₃γ-Al₂O₃ 세라믹촉매와 오존을 이용한 아닐린의 분해특성

박병기,서정권,이정민,Park, Byung-Ki,Suh, Jeong-Kwon,Lee, Jung-Min 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.4

비정질알루미나와 기공형성제에 물을 혼합하여 원통형으로 성형하고 수화한 다음, 건조 및 소성하여 직경 5mm, 평균 길이 약 10mm의 $\gamma-$알루미나 펠릿을 제조하였다. 이를 $Fe(NO_{3})_{3}{\cdot}9H_{2}O$용액과 $CH_{3}COOH$ 혼합용액에 침척시켜 $200^{\circ}C$ 온도로 3시간 수열처리한 후, 건조하고 소성하여 촉매를 제조하였다. 이와 같이 수열법에 의해 제조된 $Fe_{2}O_{3}/\gamma-Al_{2}O_{3}$ 세라믹촉매를 환경촉매로 적용하기 위해, 아닐린과 같은 난분해성물질을 촉매를 사용하지 않는 오존단독공정과 촉매를 사용하는 촉매오존(catalytic ozonation)공정으로 구분하여 $OH^{\cdot}$ 라디칼 전환반응 개시제로서의 기능과 그 분해특성을 비교하였다. We prepared the cylindrical $\gamma-alumina$ pellets of 5 mm in diameter and 10 mm in average length using amorphous alumina and pore generating agent. The pellets were immersed in an aqueous solution of the mixture of $Fe(NO_{3})_{3}{\cdot}9H_{2}O$ and $CH_{3}COOH$. They were then hydrothermally treated at $200^{\circ}C$ for 3 h in autoclave, dried and calcined. For the application as an environmental catalyst, we investigated the decomposition characteristics of aniline and the initiation characteristics of $OH^{\cdot}$ conversion action in $O_{3}$ environment with or without the $Fe_{2}O_{3}$ supported y-alumina catalyst and $O_{3}$ molecule.

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

깁사이트를 이용한 고기능 세라믹 촉매담체의 제조

박병기,서정권,이정민,서동수,Park, Byung-Ki,Suh, Jeong-Kwon,Lee, Jung-Min,Suhr, Dong-Soo 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.3

깁사이트의 급속 열분해 산물인 비정질 알루미나로부터 γ-alumina bead를 제조하고, 이를 21.87%의 질산($HNO_3$)과 28.57%의 초산($CH_3COOH$)을 혼합한 용액에 침적시킨 다음 200$^{\circ}$C 온도로 3시간 수열처리하여 결정의 변화, 기공특성, $N_2$ 흡/탈착 등온선, 기계적강도 및 내열특성 등을 조사하였다. 0.1∼0.3${\mu}$m 크기의 침상 및 판상 의사베이마이트 결정은 같은 결정구조를 갖는 1∼2${\mu}$m 길이의 침상형 베이마이트 결정으로 변했고, 이를 통해 ${\gamma}$-alumina와 베이마이트 사이에는 수열반응에 기인한 가역적 상 변화가 발생한다는 사실을 알 수 있었다. 수열처리 전 ${\gamma}$-alumina bead에 비해 $N_2$ 흡착 용량이 450㎖/g에서 670㎖/g으로 증가하였고, 100∼1000${\AA}$ 범위의 기공부피는 0.15㎖/g에서 0.77㎖/g으로 증가하였으며, 기계적 강도가 1.4MPa에서 2.2MPa로 증가하였다. 또한 40vol%의 수증기를 포함한 1000$^{\circ}$C의 고온에서도 100∼1000${\AA}$ 범위의 기공을 유지하며 ${\theta}$-alumina 결정구조를 유지하는 높은 내열저항을 나타내었다. We prepared γ-alumina beads using the amorphous alumina, obtained by fast calcination of gibbsite, and its were immersed in aqueous solution of the mixture of 21.87% nitric acid and 28.57% acetic acid. The beads thus were hydrothermaly treated at 200$^{\circ}$C for 3h, and were investigated changes of crystal, pore characteristics, $N_2$ adsorption and desorption isotherms, mechanical strengths and thermal resistance. Acicular platelet crystals of 0.1∼0.3${\mu}$m were transformed into acicular boehmite crystals of 1∼2${\mu}$m having the same crystal structure. Through this changes, we found that reversible phase transformation due to hydrothermal reaction took placed between boehmite and ${\gamma}$-alumina. In comparison to the ${\gamma}$-alumina bead before hydrothermal treatment, $N_2$ adsorption capacity was increased from 450㎖/g to 670㎖/g, and pore volume between 100${\AA}$ and 1000${\AA}$ was increased form 0.15㎖/g to 0.77㎖g, and mechanical strength was increased form 1.4MPa to 2.2MPa. Also, it showed the remarkable thermal resistance which sustained ${\theta}$-alumina crystal structure and pores between 100${\AA}$ and 1000${\AA}$ at 1000$^{\circ}$C in 40vol% steam.

메탄올 산화 카르보닐화에 의한 디메틸카보네이트 합성

남정광 ( Jeong Kwang Nam ),조득희 ( Deug Hee Cho ),서정권 ( Jeong Kwon Suh ),김성보 ( Seong Bo Kim ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.5

The synthesis of dimethyl carbonate by liquid phase oxidative carbonylation of methanol was studied under batch reaction system. Reaction factors such as effect on various metals, anion containing in copper catalyst, temperature, carbon monoxide and oxygen molar ratio and copper content were investigated. In particular CuCl2·2H2O showed the excellent of the methanol conversion 65.2%, DMC selectivity 96.6% reaction condition under 1.0 g, 150 °C, MeOH/CO/O2=0.2/0.215/0.05 (molar ratio). CuCl2 led to corrosion of the reactor. Thus, a new catalyst system using supports was investigated to resolve these corrosion problem. Influence on various supports were examined and copper catalyst supported on zeolite Y showed the most excellent activity on the formation of dimethyl carbonate. The amount of Fe dissolved during the reaction using ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometer) was compared with catalysts, calcined Cu/zeolite Y showed the lower value below 5% than CuCl2-2H(2)O.