• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.142.2-142.2
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• 2013

The effect of substrate on catalytic activity of CO oxidation with transition metal Platinum nanoparticles on doped and undoped TiO2 was investigated. Titanium dioxide was doped chemically with non-metal anions including nitrogen and fluorine. Undoped TiO2 was synthesized via simple conventional sol-gel route. Thin films of titania were developed by spin coating technique and the characterization techniques SEM, XRD, UV-Vis Absorption Spectroscopy and XPS were carried out to examine the morphology of films, crystal phase, crystallites, optical properties and elemental composition respectively. XPS analysis from doped TiO2 confirmed that the nitrogen site were interstitial whereas fluorine was doped into TiO2 lattice substitutionally. Catalytic activity systems of Pt/doped-TiO2 and Pt/undoped-TiO2 were fabricated to reveal the strong metal-support interaction effect during catalytic activity of CO oxidation reactions. By arc plasma deposition technique, platinum nanoparticles with mean size of 2.7 nm were deposited on the thin films of doped and undoped titanium dioxide. The CO oxidation was performed with 40 Torr CO and 100 Torr O2 with 620 Torr He carrier gas. Turn over frequency was observed two to three folds enhancement in case of Pt/doped TiO2 as compared to Pt/TiO2. The electronic excitation and the oxygen vacancies that were formed with the doping process were the plausible reasons for the enhancement of catalytic activity.

• 공업화학
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• 제28권2호
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• pp.158-164
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• 2017

본 연구에서는 다양한 상용 SCR 촉매의 $NH_3$-SCR 반응특성을 확인하기 위하여 반응활성 및 XRD, BET, Raman 분석을 수행한다. 상용 SCR 촉매는 바나듐 함량(1.3-5.4 wt%)이 증가함에 따라 선형적으로 반응속도가 증가됨을 확인할 수 있다. 또한, 상기 분석을 통하여 VOx 표면밀도가 8.1 이상의 촉매를 선별하고, 표면 구조분석을 통해 Crystalline VOx가 형성되지 않은 범위 내에서 촉매 내 WOx의 첨가는 TOF를 증가시키는 것으로 확인할 수 있다. $SO_2$ 내구성의 경우 바나듐 함량이 증가하면 크게 감소하는 경향을 보이며, W과 Si가 첨가될 때 내구성이 가장 크게 증가한다.