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研究生:許永富
論文名稱:活性碳觸媒在氨選擇性還原氮氧化物中的反應性研究
論文名稱(外文):Studies on Catalytic Activated Catbon for Selective Reduction of Nitrogen Oxides with Ammonia
指導教授:鄧熙聖
學位類別:碩士
校院名稱:中原大學
系所名稱:化學工程學系
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:138
中文關鍵詞:活性碳觸媒氮氧化物
外文關鍵詞:Activated CarbonCatalystNitrogen Oxides
相關次數:
  • 被引用被引用:6
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本研究利用氨氣在活性碳觸媒上,進行將一氧化氮(NO)還原的探討。此還原反應是在一U型填充床反應器中進行,反應溫度在140-320℃之間。活性碳觸媒的製備是以一種亞煙煤(sub-bituminous coal)及兩種煙煤(bituminous coal)為原料,利用不同的製程,裂造出不同表面特性的觸媒產品。大致上研究可分為兩部份來探討:AD觸媒的反應性及觸媒種類的探討。在AD觸媒的反應性研究中發現,由同一種煤原料所製成的活性碳觸媒,其對NO的還原活性是隨著其BET表面積的增加兩增加。在反應氣體中加入1% O2的狀態下,轉化率的增加可達一倍以上。顯示NO在活性碳觸媒上反應時,氧氣的存在有其必要性。在反應動力學探討方面,對AD觸媒而言,在無氧狀態下,NO轉化率隨著反應溫度的增加而增加,其反應活化能為l8kJ/mol。NO的消失速率亦隨著NO和NH3濃度的增加而增加,其整體的反應次數分別為0.52和0.26。
在觸媒種類的探討上發現,由不同的煤原料所製成的活性碳觸媒,其對NO的反應性亦隨者表面積的增加而增加。但是活性隨表面積增加的比例,隨不同煤原料所製成的觸媒而有不同。對於不同的活性碳觸媒而言,在反應氣體中加入1% O2的狀態下,皆可將NO的轉化率大幅提昇。
The NO reduction by activated carbon catalyst with ammonia in this study. The reaction were progress in U-type pyrex reactor, the reaction temperature rang was 140-230℃. The sample of catalysts were prepared from a sub-bituminous coal and two bituminous coals, the catalyst with different surface characteristic were prepared by different preparation process. This study explored two objects: the reactivity of AD catalysts and the influence of the kinds of catalysis.
The reactivity of AD catalyst in this study, experiment results show that the catalyst reactivity of NO reduction is increased with the BET surface area of catalysts which prepared with the same coal precursor. Added 1% O2 into the reaction gas, the reactivity of NO reduction will enhance more than 1 times. It show that the reaction of NO reduction on activated carbon catalyst, the O2 present in the reaction gas is necessary.
In the kinetic study, for AD catalyst in absent O2, the NO conversion increase with the reaction temperature, activation energy 18 kJ/mol. The rate of NO disappear increase with the concentration of the NO and NH3. The reaction order of global kinetics of NO and NH3 is 0.52 and 0.26 respectively.
The influence of reactivity for different catalyst series, the catalyst prepared from different coal precursor, the NO conversion also increased with the BET surface area. But the ratio of reactivity increased differently with different coal precursor. For different catalyst, added 1% O2 into the reactant gas, the NO conversion enhanced profusely.
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