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동이 담지된 제올라이트의 실리카-알루미나 비가 일산화탄소의 산화반응에 미치는 영향
최고열 서울산업대학교 산업대학원 1993 大學院論文集 Vol.2 No.-
실리카-알루미나 비 및 구조가 다른 여러종류의 제올라이트에 동을 담지시킨 촉매상에서 일산화탄소의 산화반응을 실시하였다. 이들 촉매들에 대해 XPS, IR, TPR 및 TPO 분석을 하여 구조 및 실리카-알루미나 비가 담지된 동의 환원-산화특성 및 일산화탄소 산화반응의 활성에 미치는 영향에 대해 연구하였다. 제올라이트 중에서는 구조의 실리카-알루미나 비가 증가할 수록 일산화탄소 산화반응 활성은 증가하였다. 이는 알루미늄의 추출에 의해서 구조의 실리카-알루미나의 비를 조절한 모더나이트에서 나타난 결과와 일치하였다. 실리카-알루미나의 비가 증가할 수 록 높은 활성을 나타내는 것은 이 비가 증가할 수록 산강도가 증가하므로 담지된 동의 전자를 강하게 끌어당겨 흡착된 산소와의 결합력을 약화시키므로서 촉매의 환원온도를 낮게 하기 때문이다. The oxidation of carbon monoxide was carried out on copper impregnated zeolites with the different crystal structure and silica-alumina ratio. These catalysts were characterized by XPS, IR, TPR, and TPO analyses to investigate the effect of crystal structure and silica-alumina ratio on the redox behavior of impregnated copper and the activity of carbon monoxide oxidation. The activity of carbon monoxide oxidation increases with increase in the silica-alumina ratio of zeolite, which is the same result as in the case of mordenite with different silica-alumnia ratio. The supports having higher silica-alumina ratio show higher acid strength and possess more strong electron acceptor sites. These sites weaken the bond strength between copper and adsorbed oxygen by attracting the electron of copper and lower the reduction temperature of copper. Therrefore, the activity of carbon monoxide increases with the silica-alumina ratio of zeolites.
최고열 서울産業大學校 1997 논문집 Vol.45 No.1
Noncatalytic combustion of carbon by nitrogen dioxide, nitrogen monoxide or/and oxygen was carried out in a thermogravimetric analysis system. Of a1l oxidants nitrogen dioxide was the mast effective, whereas nitrogen monoxide did not show any activity for the combustion of carbon. The combustion rate of carbon by oxygen was very low below 550 ℃, however, it increased rapidly at higher than that temperature. The addition of nitrogen monoxide to oxygen does not appear to influence the combustion rate of carbon by oxygen. The combustion of carbon was not diffusion limited, but mainly affected by the surface area of carbon. The kinetic results showed that the combustion rate of carbon was dependent only on the concentration of nitrogen dioxide, but not on the amount of carbon. The reaction order was first with respect to the concentration of nitrogen dioxide and activation energy was 10.0 kcal/mole.
합성 β-zeolite 상에서 프로펜에 의한 벤젠의 알킬화 반응
우성남,최고열 서울産業大學校 1997 논문집 Vol.45 No.1
The β-zeolites were synthesized in Na₂0-SiO₂-Al₂O₃-TEAOH system. The alkylation of benzene by propene on those catalysts was studied. The most important factor affecting the synthesis of β-zeolite was found to be the amount of TEAOH (tetraethylammonium hydroxide). When the ratio of TEA0H/Si0₂ was about 0.25-0.43, theβ -zeolite having a wide range of SiO₂/A1₂O₃ ratio cou1d be synthesized. The selectivity to cumene in the alkylation of benzene by propane was 92%, and no deactivation was observed even after 20 hows-on-stream.
銅 澹持 및 混合 모더나이트 觸媒上에서 酸化炭素의 酸化反應
최고열,하백현 서울産業大學校 1992 논문집 Vol.36 No.1
Characterization of copper impregnated- and mixed- mordenites was carried out to investigate the effect of the state of copper on the oxidation of carbon monoxide. By the redox-treatment in the hydrogen/oxygen stream at 500℃, copper in mordenites exists mainly in the from of CuO irrespective of the method of preparation. However, in the case of mixed catalyst, copper was oxidized to Cu(Ⅱ) state by high temperature reduction and oxidation(750℃/500℃). Acivity of both impregnated- and mixed-catalysts increased with the amount of loaded copper. During the reaction of carbon monoxide oxidation, copper was finely dispersed in the mordenite pore structure as a state of CuO. There are two peaks in the CO-TPR profile. Low temperature peak, in which CuO is reduced to Cu(0) via CuD is concemed with the activity of cardon monoxide oxidation. Oxidation property of loaded copper shows no effect on the activity of carbon monoxide oxidation.
최고열,이창용 서울産業大學校 1993 논문집 Vol.38 No.1
염산처리에 의하여 실리카 /알루미나 비가 다른 모더나이트를 제조하고, 여기에 동을 담지시켰다. 제조된 시료에 대하여 환원·산화처리 온도 및 동함량에 따른 동이온의 특성을 관찰하기 위하여 ESR 분석을 행하였다. 500℃에서 환원·산화처리한 시료에서 동이온은 이온교환시료의 동이온과 비슷한 특성을 나타내었다. 그러나 750℃에서 환원·산화처리한 시료의 경우 500℃에서 환원·산화처리한 시료와는 달리 환원·산화처리시 모더나이트 결정구조의 부분적인 변화에 기인하여 불포화배위의 유리 동이온이 존재하였다. Copper containing modernities which have different silica/alumina ratio were prepared by acid leaching, followed by impregnation with copper. ESR study on these mordenites was carried out to investigate the effect of redox treatment and copper content on the behavior of cupric ions in these samples. When the copper impregnated mordenites were redox-treated by hydrogen and oxygen at 500℃, the behavior of cupric ions in these samples was similar to that of cupric ions in the ion-exchanged mordenites. However, redox-treated at 750℃, coordinatively unsaturated cupric ions exist due to the slight change of mordenite structure during the high temperature redox treatment.