DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Han, Jong-In | - |
dc.contributor.advisor | 한종인 | - |
dc.contributor.author | Satwika, Golagana Lakshmi | - |
dc.date.accessioned | 2018-06-20T06:12:38Z | - |
dc.date.available | 2018-06-20T06:12:38Z | - |
dc.date.issued | 2017 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675044&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/242678 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 건설및환경공학과, 2017.2,[vi, 36 p. :] | - |
dc.description.abstract | A new clay mineral supported Sn-Pd bimetallic catalyst is developed in this study for active nitrate reduction and selective nitrogen production. Kaolinite which is a simple eco-friendly clay mineral has been used as a support for bimetallic system. The synthesized catalyst has been characterized using X-ray diffraction (XRD), Furrier Transformation Infrared spectroscopy (FT-IR), specific surface area (BET), transmission electron microscopy with energy dispersive X-ray spectroscopy (TEM-EDX), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The catalyst was optimized under variety of conditions (i.e., promoter metal type (Sn, Cu, Ni, Mn), noble metal type (Pd, Pt Au), promoter metal concentration (0-3.4%), noble metal concentration (0-2.8%), $H_2$ flow rate (0-60ml/min), $CO_2$ flow rate (0-60ml/min) and calcination temperature ($0-550^\circ C$). Complete nitrate removal and 70% nitrogen selectivity is achieved with 2.2% Sn and 2.2% Pd at $450^\circ C$ calcination temperature with 30ml/min $H_2$ and 60ml/min $CO_2$ flow rates respectively. A high kinetic rate constant of (k = $18.16 \times 10^{-2} min^{-1}$) is also achieved with optimized Sn-Pd/kaolinite catalyst. The stability of the catalyst is checked in a continuous reactor system. During the continuous test (170 h reaction), excellent nitrate removal was observed (100 % up to 60 h) with 50% $N_2$ selectivity. However removal gradually decreased to 80% in 170 h with 40% $N_2$ selectivity. The leaching of the metals Sn, Pd was low even after 170h of reaction, confirming that catalyst had adequate amount metal particles for further $NO_3$-reduction. XPS results confirmed that the decrease in reactivity after 70 h was mainly due to the oxidation Sn. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Catalytic nitrate reduction | - |
dc.subject | Kaolinite support | - |
dc.subject | bimetallic catalyst | - |
dc.subject | Optimization factors | - |
dc.subject | Continuous test | - |
dc.subject | 촉매 작용의 질산염 환원 | - |
dc.subject | 카올리나이트 지지체 | - |
dc.subject | 이원 금속 촉매 | - |
dc.subject | 최적화 인자 | - |
dc.subject | 연속 공정 | - |
dc.title | Aqueous nitrate reduction by Sn-Pd/kaolinite catalyst | - |
dc.title.alternative | Sn-Pd 이중금속 촉매제를 이용한 질산성 질소의 환원 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :건설및환경공학과, | - |
dc.contributor.alternativeauthor | 사뛰카, 걸가나 라그스미 | - |
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