• Journal of Life Science
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• v.16 no.3 s.76
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• pp.375-381
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• 2006

Aldehyde reductase was purified to electrophoretic homogeneity from Saccharomyces cerevisiae, and then enzymatic reduction of substituted carbonyl compounds was carried out by using the purified aldehyde reductase as a biocatalyst. Under preparative scale reaction renditions, the enzymatic reduction proceeded in high chemical yield with excellent chemoselectivity. The enzymatic reduction product was identified by TLC, GC, Mass, NMR and FT-IR. Benzoic acid, an inhibitor of aldehyde reductase, also potently inhibited the reduction of substituded carbonyl compounds. This enzyme exhibited a broad substrate specificity , and can utilize both NADH and NADPH as cofactors. The enzyme was strongly inhibited by benzoic acid and quercetin. The apparent Km for 4-cyanobenzaldehyde and 3-nitrobenzamide were 4.894 mM and 0.305 mM, respectively.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.11a
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• pp.263-264
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• 2002

연소시설에서 배연가스중의 NOx 배출을 저감하기 위하여 선택적 촉매 환원법(SCR)과 선택적 무촉매 환원법(SNCR)이 널리 이용되고 있다. 이러한 촉매처리는 Pt와 같은 귀금속이 포함된 촉매 하에서 암모니아를 환원제로 사용하였으나, R와 같은 귀금속의 경우 배연가스내에 함유된 중금속이나 비소(Arsenic), SOx, 비산재(fly ash)등에 의해 쉽게 비활성화(deactivation)되는 단점이 있다(Sumitra R et al., 1995). (중략)

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1997.10a
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• pp.162-163
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• 1997

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1999.11a
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• pp.35-39
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• 1999

현재 NO제거에 주로 사용되는 환원제로서 NH$_3$가 있는데 이는 NO에 대한 선택도가 우수하기 때문이다. 그러나, NH$_3$는 독성이 강하고 부식성이 있어 저장 및 수송에 많은 비용이 든다는 단점이 있다. 따라서 본 연구에서는 SOx/NOx 동시 제거 공정에 효과적으로 알려진 fresh and sulfated CuO/${\gamma}$-A1$_2$O$_3$촉매상에서 독성이 강한 NH$_3$를 대신하는 새로운 환원제로서 urea용액을 이용하여 유동층 반응기에서 SCR을 수행해 보고자 한다.(중략)

• Journal of the Korean Chemical Society
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• v.18 no.5
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• pp.363-367
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• 1974

Approximate rate and stoichiometry of the reaction of ten compounds which contain functional group such as nitrile, nitro, halogen and one of these functional group together with a carbonyl group by the two phase reduction were tested at room temperature. Nitrile, nitro and halogen were all inert under these condition. Therefore selective reduction of carbonyl group in the presence of these group were examined. Thus m-nitrobenzaldehyde, m-nitroacetophenone, p-bromoacetophenone and p-cyanobenzaldehyde were reduced to corresponding alcohols in excellent yields, 95∼100 %.

• The Journal of the Convergence on Culture Technology
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• v.7 no.2
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• pp.389-394
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• 2021

In this work, we study the properties of molecular structure and boundary orbital functions of the DPHMP-AlH and propiophenone and butyrophenone, which are forms of alkoxy-amine-aluminum derivatives. Furthermore, we investigate the effect on the selective reduction of the final products (R), (S)-phenylpropanol and (R), (S)-phenylbutanol by calculating the stereoscopic and thermodynamic parameters of the transition state. Considering the three-dimensional molecular structural stability, the transition status of (S) types DPHMP-AlH and alkylphenone was found to be more stable, resulting in the selective reductions of DPHM-AlH and alkylphenone from this result: (S)-(1)-phenylpropanol and (S)-(1)-phenylbutanol was confirmed that the formation was advantageous.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.445-445
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• 2011

본 연구에서는 편극 패턴된 강유전체 단결정 $LiNbO_3$ 기판에 광화학적 반응에 의해 금속(Au, Ag, Cu)나노입자를 표면에 선택적으로 성장하였다. 강유전체는 자발편극성의 특성을 지니고 있기 때문에 선택적으로 전압을 가하여 편극성의 역전에 의해 표면의 편극성을 선택적으로 패터닝이 가능하다. 본 연구에서는 주기적으로 양의 편극 영역과 음의 편극 영역이 패턴된 $LiNbO_3$ 기판을 사용하였다. 표면의 편극성은 압전소자반응현미경법(PFM)을 이용하여 확인하였으며, 극성은 R-V curve로 확인하였다. 금속입자는 금속입자를 포함하는 용액에 기판을 넣고 자외선을 조사하여 성장시켰다. 성장된 금속입자의 표면 분포 및 분석은 AFM을 이용하여 측정하였다. Ag 입자를 성장시킨 결과, (-z)편극 영역보다 (+z)편극영역에서 보다 많은 금속 나노입자들이 환원반응을 일으켜 나노입자를 형성하였으며, 경계영역 (inversion domain boundary)에 가장 많은 나노구조체가 형성되었다. Au 입자의 경우, (+z)편극영역이 (-z)편극영역의 표면보다 더 많은 입자가 형성되었지만 Ag입자처럼 편극영역의 경계에서 많이 증착되는 경향성은 보이지 않았다. Cu 입자의 경우 광화학반응을 거의 일으키지 않았으며, 편극영역에 따른 증착 경향성도 보이지 않았다. 이와 같은 결과를 증착된 금속 나노입자의 편극에 따른 표면분포를 강유전체 표면 극성에 따른 표면 밴드구조와, 각 입자가 지닌 환원전위와 전자친화도에 관련된 모델로 설명할 것이다.

• Journal of the Korean Chemical Society
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• v.39 no.10
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• pp.812-817
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• 1995

Rapid and selective reduction of aromatic nitro compounds is of important for the preparation of amino derivertives in organic synthesis, particularly when a molecule has other reducible substituents. While Bakers' Yeast has been used for the enantioselective reduction of carbonyl compounds, little attention has been paid to the reduction of aromatic nitro compounds with Bakers' Yeast. Nitro group of m-bromonitrobenzene was selectively and rapidly reduced to corresponding amino derivative in good yield by Bakers' Yeast in basic solution. Furthermore, nitrosobenzene was rapidly reduced to aniline in good yield by Bakers' Yeast under neutral condition. In this paper, we wish to report a rapid and simple reduction of m-bromonitrobenzene and nitrosobenzene to the corresponding amino derivatives using Bakers' Yeast. And the effects of various agents, temperature and pH on the reduction will be discussed.

• Journal of Korean Society of Environmental Engineers
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• v.22 no.11
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• pp.1977-1983
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• 2000

SCR(selective catalytic reduction) pilot plant for reduction of the nitrogen oxides using diesel oil as a reductant was installed at the NG(natural gas) fired combined cycle and the activity of Pt(0.3%)/Zeolite catalyst was studied in real flue gas condition according to the amount of reductant. reaction temperature and space velocity. NOx conversion gradually increased with increasing the diesel oil concentration up to C/N ratio 5.5(C/N ratio: the ratio of the number of carbon atom to the number of NOx molecules included in the flue gas). Increasing the reaction temperature. NOx conversion increased and reached a maximum conversion of 50% at $190^{\circ}C$. NOx conversion did not changed with increasing the space velocity up to 18,500/hr and then gradually decreased. These results reveal the potential for diesel oil as a reductant for de-NOx SCR process.

• Journal of the Korean Chemical Society
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• v.52 no.3
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• pp.338-340
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• 2008