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研究生:曾庭科
研究生(外文):Tseng, Ting Ke
論文名稱:以MnO/Fe2O3觸媒焚化處理苯乙烯之研究
論文名稱(外文):The CAatalytic Incineration of Styrene over a MnO/Fe2O3 Catalyst
指導教授:朱信朱信引用關係
指導教授(外文):Chu Hsin
學位類別:碩士
校院名稱:國立成功大學
系所名稱:環境工程學系
學門:工程學門
學類:環境工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
論文頁數:232
中文關鍵詞:觸媒焚化苯乙烯
外文關鍵詞:CatalyticIncinerationStyreneMnO/Fe2O3
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石化工業製程所排廢氣中常含有揮發性有機物VOCs(Volatile Organic
Compounds),由於具有高度的光化學反應力,在陽光下經由紫外線照射,
容易被氧化形成游離基(radicals),會再與大氣中的其它成份如NO2、O3
反應,形成高濃度的臭氧、空氣污染煙霧(Smog)和致癌物質,如醛、酮及
PANs等,故一直是石化業工業空氣污染事件主要原因。本研究主要以
N-150型商用觸媒MnO/Fe2O3來處理工業界常見之揮發性有機污染物苯乙烯
。實驗探討主要分為三部分:1. 以MnO/Fe2O3觸媒用來焚化處理苯乙烯時
的操作參數,包括溫度、VOCs進流濃度、空間流速及氧濃度等。2. 觀察
隨著處理時間的增加,觸媒活性下降的情形。3. 同時配合最常在文獻上
被討論並使用的三種反應動力模式:power-rate law model、Mars and
Van Krevelen model、Langmuir-Hinshelwood model,並觀測實驗數據之
符合情形。以求取最佳反應動力模式。以MnO/Fe2O3觸媒焚化處理苯乙烯
,其轉化率隨進流溫度的上升而增加、氧濃度的增加而增加,但隨進流濃
度及空間流速增加而減少。由統計變異數分析中比較各操作參數之F-
Ratio值,可知在操作範圍內,以進流溫度為最顯著影響因子,其次為氧
濃度,再其次為進流濃度,而空間流速的影響則相對最小。以微分型反應
器設計方法求取焚化VOC觸媒反應動力模式中,在實驗操作範圍內對苯乙
烯而言,反應以Langmuir-Hinshelwood model描述較為適當。所求得之觸
媒反應之活化能在低溫時為6.690 kcal/mole(氧分子吸附)及6.971
kcal/mole(氧原子吸附)。高溫時之反應之活化能為3.930 kcal/mole(
氧分子吸附)及3.837 kcal/mole(氧原子吸附)。
Volatile organic compounds (VOCs) are the typical pollutants
emitted from the petrochemical industrial processing. They are
high radicals , react with some chemical compounds like Nox ,
Ozone in the atmosphere , and photochemical smog , carcinogen
are formed also. Hence, VOCs are the main problem in air
pollution prevention of petrochemical industry always.This study
treated Styrene (SM) by means of a commercial catalyst, MnO/Fe2
O3 in a fixed bed reactor. It can be classfied into three major
parts. 1. We investigate the effects of operating factors,such
as temperature,VOC concentration,space velocity and O2
concentration on the performance of the catalyst.2. A couple of
life-tests of the catalyst were carried out to characterize the
effect of Styrene(SM)poisoning.3. Three kinetic models,such as
power-rate law,Mars and van Krevelen model and Langmuir-
Hinshelwood model were used to fit the kinetic data of the
incineration of Styrene(SM).We found that,from the
experimental results, it would get higher conversion of SM for
higher inlet temperature, and higher oxygen concentration did
also. The conversion of SM decrease with the increasing VOC
concentration and space velocity. From the statistical analysis
of regression parameters,we found that the parameter "temp" is
the most effective factor on the catalytic oxidation, and
"oxygen concentration", "SM concentration", "space velocity"
effectivity catalytic oxidation in seriation.The results of
kinetics were shown as follows: By the differential method, the
kinetic of catalytic incineration of Styrene is suitable for the
Langmuir-Hinshelwood model, and its Activation Energy are 27.968
KJ/mole(Molcular Oxygen adsorbed) and 29.151 KJ/mole(Atomic
Oxygen adsorbed)at low temperature.Its activation energy,at
high temperature,are 16.439 KJ/mole(Molcular Oxygen adsorbed)
and 16.050 KJ/mole(Atomic Oxygen adsorbed).
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