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題 名 | Catalytic Reduction of Nitric Oxide with Methane Over the Perovskite-Type Catalysts=波洛斯凱特型觸媒用於甲烷還原一氧化氮 |
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作 者 | 沈孝宗; 翁鴻山; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 29:3 1998.05[民87.05] |
頁 次 | 頁211-217 |
分類號 | 468.8 |
關鍵詞 | 波洛斯凱特型觸媒; 甲烷; 還原; 一氧化氮; Perovskite catalyst; Nitric oxide; Methane; Catalytic reduction; |
語 文 | 英文(English) |
中文摘要 | 本研究針對以甲烷為還原劑之一氧化氮還原反應,由四個系列之波洛斯凱特型觸 媒篩選出活性最佳之觸媒,並藉由一氧化氮程溫脫附( NO-TPD )與甲烷程溫還原( CH �� -TPR )及反應物濃度對反應之影響等實驗以探討影響觸媒活性之因素。 活性測試之結果顯 示:LaMnO �凰眼C具有最佳之活性。在四個系列中,以鍶取代鑭皆會造成活性的下降。一氧 化氮程溫脫附的圖譜顯示:一氧化氮之吸附為影響觸媒活性的因素之一;在表面強吸附之一 氧化氮會阻礙甲烷還原觸媒而使反應須在較高溫才能進行。甲烷程溫還原的實驗結果,顯示 晶格氧的釋出與二氧化碳之脫附亦為影響活性之因素。晶格氧的容易釋出與二氧化碳之容易 脫附會使觸媒具有較高之活性。根據上述之結果與反應物濃度對轉化率影響之結果,我們可 假設觸媒被甲烷還原為此反應之第一步聚,而二氧化碳之脫附為此反應之速率決定步驟。 |
英文摘要 | A catalyst with the highest activity is selected from four series of perovskites for reducing NO with CH �� as a reducing agent. The influencing factors on catalytic activities are also closely examined by characterizing the perovskites by NO-TPD, CH �� -TPR, and by investigating the effect of reactant concentrations. Experimental results indicate that the LaMnO �� catalyst has the highest activity. Also, substituting La with Sr decreases the activity in all four series catalysts. The result of NO-TPD experiment reveals that the NO adsorption is an influencing factor in this catalytic reduction reaction. The strongly adsorbed NO on the surface inhibits the reduction of the catalyst by CH �� and forces this reaction to take place at a higher temperature. The CH �� -TPR reveals that the lattice oxygen delivery and CO �� desorption from catalyst are two other factors affecting the activity. The ease of lattice oxygen delivery anc CO �� des orption will benefit the reduction of the catalyst by CH �� and hence produce more oxygen vacancies for the catalyst to react with NO. Basing on the above explanation and the results of the investigation on the effect of reactant concentrations, we propose that the reduction by CH �� is the first step in this NO + CH �� reaction and the CO �� desorption is the rate-determining step at a higher temperature range. |
本系統中英文摘要資訊取自各篇刊載內容。