利用有機化合物TTIP於預混平板火燄中合成TiO2奈米微粒之研究

Gas-phase Combustion Synthesis of TiO2 Nanoparticles with TTIP in Premixed Flat Flame

廖思翰(Sze-Han Liao)

指導教授 ： 馬小康

國立臺灣大學/工學院/機械工程學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.01114

摘要

奈米材料科技為未來新興科技的主要技術，世界各國也已投入大量人力與資金積極發展，而奈米光觸媒（TiO2）更是在目前已被廣泛使用，TiO2具有強大的氧化還原能力、化學穩定性高以及無毒等特性。本實驗利用氣相燃燒合成法合成奈米TiO2粉體，利用火焰高溫所擁有的自我純化、同質成核、可連續生產、均質度高等特性。同時採用新的鈦前置源TTIP取代傳統具腐蝕性的TiCl4，藉著改變燃燒器、前置源濃度、氧氮比例、流量等參數來觀察火焰結構、溫度對產物特性的影響。實驗結果顯示，平板火焰與本生式火焰在結構上差異大，進而影響溫度分佈趨勢、產物晶相及粒徑大小。當氧氮比例增加，Anatase晶相含量比例增加；若濃度增加則Rutile晶相含量增加，而流量的改變對於晶相的影響較小。結果可看出對產物晶相而言，其操作參數的影響大小依序為 : 氧氮比例＞濃度＞流量。就粒徑而言，不同操作參數下平板式燃燒器生成的粒徑範圍為 100 ~ 500nm，最小的粒徑約 40nm。本生式的粒徑結果較不均勻，分佈廣泛。而平板式較均勻、較短的火焰可生成較細且均勻的產物；但本生式燃燒器控制晶相的能力則比平板式好。

關鍵字

二氧化鈦 ； 平板式 ； 火燄 ； 本生式 ； 晶相 ； 奈米 ； 粒徑 ； 預混 ； 甲烷 ； 合成 ； 燃燒

並列摘要

Nanotechnology is the promisingly rising technology. Massive attention from countries around the world has appealed lots resources and money in related research. Photocatalyst (TiO2) is presently and widely used with its strong comprehension of oxidation, decomposition, atmospheric purification, deodorization, water purification, and stability. This research is to study the formation mechanism of nanosized TiO2 particles through gas-phase combustion synthesis because its high flame temperature brings fine self-purifying, homologous nucleation, and continuously uniform producing. Also, a new precursor, TTIP, is introduced to replace the conventional corrodible precursor, TiCl4. Flame temperature profile, TiO2 crystallinity, and particle size are studied under different burners, concentration of precursor, O2/N2 molar ratio, and flow rate. The results show that significant variations on the flame structure occur in different burners, leading to a further influence on temperature distribution, crystallinity and particle size of product. When O2/N2 molar ratio rises, the Anatase wt% grows. The rise of TTIP concentration leads to a climb of Rutile wt%. The range of TiO2 particle size averages from 100nm to 500nm under different operation parameters in flat flame burner while the smallest is about 40nm. In Bunsen burner, the particle size distributes wider and larger, and it shows better comprehension in crystallinity control than flat flame burner which produces smaller and more uniform particles due to its short constant flame structure.

並列關鍵字

TiO2 ； titania ； bunsen ； crystalline ； nano ； combustion ； burner ； synthesis ； flat ； flame ； premixed ； particle ； methan

參考文獻

2. R. A. Spurr, H. Myers, Quantitative analysis of Anatase-Rutile mixtures with an X-ray diffractometer, Analytical Chemistry, 29, 760 (1957)

3. Ulrich, Theory of particle formation and growth in oxide synthesis flames, Combustion Science Technology, 4, 47 (1971)

4. Ulrich, Particle growth in flames-Ⅲ. Coalescence as arate-controlling process, Combustion Science Technology, 17, 119 (1977)

5. Ulrich, Riehl, Aggregation and growth of submicron oxide particles in flames, Journal of Colloid Interface Science, 87, 257 (1982)

6. Ulrich, Flame synthesis of fine particles, Chemical and Engineering News, 62, 22 (1984)