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MoO<sub>3</sub> Morphology 변화가 수소 Spillover에 미치는 영향
김진걸,Kim, Jin Gul 한국공업화학회 1999 공업화학 Vol.10 No.8
sothemal reduction at $50^{\circ}C$ using $Pt/MoO_3$ or $Pt/MoO_3/SiO_2$ made by dry impregnation or physical mixture of $Pt^{\circ}$ and $MoO_3$ demonstrated that the $H_2$ uptake vis $H_2$ spillover from Pt into $MoO_3$ was enhanced as calcination temperature was increased. Surface area of exposed Pt crystallites measured by CO chemisorption was decreased with higher calcination temperature. In addition, TEM showed that $MoO_x$ overlayers were formed on Pt crystallites after calcination at $400^{\circ}C$. Consequentially, it was found that this increased active contact sites between Pt and $MoO_3$ due to surface morphological change was one of the dominant factors for this increased $H_2$uptake via $H_2$ spillover from Pt crystallites into $MoO_3$. 함침법에 의하여 제조된 $Pt/MoO_3$와 $Pt/MoO_3/SiO_2$ 및 $Pt^{\circ}$와 $MoO_3$를 기계적으로 혼합한 촉매를 사용한 $50^{\circ}C$ 등온 환원 실험에서 소성 온도가 증가할수록, $H_2$ spillover에 의하여 Pt로부터 $MoO_3$로 이동하여 저장되는 $H_2$가 증가하는 것을 측정하였다. 연속적으로 실행한 CO chemisorption에 의하여 $H_2$ spillover에 참가하는 $H_2$에 노출된 Pt 표면적이 감소하는 것을 알 수 있었다. 또한, TEM 결과로부터 $400^{\circ}C$에서 소성 후 Pt결정 표면에 $MoO_x$ overlayer가 형성되는 것을 관찰하였다. 그러므로, 표면 형상 변화에 따른 Pt과 $MoO_3$간의 활성접촉점 증가가 $H_2$ spillover에 의한 $MoO_3$로의 $H_2$ 이동을 증가시키는 원인 중의 하나인 것으로 판명된다.
김진걸,임정균,Kunkul Ryoo,전지용,유승준,김성수 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
In order to improve NOx storage and reduction (NSR) kinetics over Pt/Co/Ba/Al2O3 catalyst in thepresence of SO2, Fe was added as a promoter to inhibit sulfation. A NOx analyzer was used tomeasure theNOx concentration of the gas phase and in-situ diffuse reflectance infrared Fourier transform (DRIFT)spectroscopy was dedicated to analyze the interaction between the adsorbed reactive species from thegas phase and solid catalyst surface. NSR results showed that the addition of Fe to Pt/Co/BaO/Al2O3increased the NOx uptake. The presence of Fe inside catalyst contributed to enhancing the ability ofresistance to SO2 exposure. In situ DRIFT study confirmed that Fe played a role as an active inhibitor tosulfation based on the decreased intensity of band at 1120 cm 1. An isothermal temperature reduction(ITR) experiment at 300 8C showed that Fe would work to improve the reduction ability of stored NOx inthe lean cycle and catalyst regeneration during the rich cycle.
김진걸 순천향대학교 부설 산업기술연구소 2017 순천향 산업기술연구소논문집 Vol.23 No.1
Since NOx exhaust has caused air pollution, many research has focused to develop the technology for NOx removal. Traditionally, the noble metal such as Pt, Pd and Rh exhibited an excellent efficiency for NOx removal. However, these noble metal have been very costly, so that the replacement of these metals has been studied extensively. In this paper, the efficiency of NOx removal was studied as a function of cobalt loading over Al2O3 and Co dispersion.
김진걸 순천향대학교 부설 산업기술연구소 2017 순천향 산업기술연구소논문집 Vol.23 No.1
NOx exhaust from stationary has known as one of serious environmental pollution source. In order to solve this problem , HC-SCR would be the very suitable technology because this can be easily adapted to the system of stationary source. To apply the HC-SCR, it would be essential to evaluate the suitable catalyst for NOx removal. In this paper, the optimum Fe loading over Al2O3 support was found to be 10% Fe/Al2O3 and Fe dispersion was found to be increased as Fe loading increases.
김진걸,정주영 한국공업화학회 1999 응용화학 Vol.3 No.1
The Coefficient Diagram Method(CDM) is formalized and presented as the control synthesis method was introduced as an algebraic design method of which paradigm was based on the relative size of the coefficients of the characteristic polynomial. It was demonstrated that examples comparing the performance of CDM controllers showed better characteristics than Ziegler-Nichols and ITAE are presented.