NO在Perovskite oxide上的分解反應之研究

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Title:	NO在Perovskite oxide上的分解反應之研究
Authors:	陳俞璁;Yu-Tsung Chen
Contributors:	化學工程與材料工程研究所
Keywords:	EXAFS;XANES;O2-TPD;Perovskite;NO分解反應
Date:	2001-07-19
Issue Date:	2009-09-21 12:19:11 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本論文主要使用sol-gel方法合成Perovskite觸媒，進行NO分解催化反應，利用氧氣程溫脫附實驗來分析Perovskite的氧氣脫附性質，及以X光吸收光譜術來分析La1-xSrxMO3(M=Co?Mn?Fe?Ni)與LaCoyMn1-yO3中，Co?Mn?Fe?Ni的周圍環境。 Perovskite型混合氧化物﹐具有高熱穩定性﹐對CO?碳氫化合物具有良好氧化力﹐對NO的分解也有相當的活性﹐加上價格較低廉﹐遂有取代原本貴重金屬支撐在氧化鋁上的研究價值。本篇論文發現La1-xSrxMO3（M = Co?Fe?Mn?Cr）中Sr取代量增加，可以提升NO分解反應活性，尤其是低溫區的反應活性。經過Mn部份取代Co而成的LaCo0.9Mn0.1O3與LaCoO3相比有較高的低溫反應活性。利用氧氣程溫脫附分析及X光吸收光譜分析分別可以解釋Perovskite觸媒氧空缺及A?B位置元素部份取代的Perovskite觸媒對NO分解反應活性的變化趨勢。 In this study, Perovskite oxides synthesized by sol-gel method are used as the catalyst for NO decomposition reaction. Oxygen desorption propreties of Preovskite are studied by O2-TPD experiments. The local environments around Co, Mn, Fe and Ni ions are examined by means of X-ray absorption spectroscopy of LaMO3(M=Co, Mn, Fe, Ni) and LaCoyMn1-yO3. Results indicate partially substitution of La by Sr in Perovskite oxides and by a small amount of Mn in LaCoO3 can improve the activity of NO decomposition. The results of O2-TPD show that the amounts of desorbed oxygen between 300 to 600℃(α´peak) increases with increasing amount of Sr substitution for La in Perovskite oxides. X-ray absorption spectroscopy results show decrease of coordination numbers when Sr substitutes La. Oxygen vancancies are generated by partial substitution of La by Sr. The increase of activity for NO decomposition can be attributed to the increase of oxygen vancancies upon substitution.
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] Electronic Thesis & Dissertation

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