2006-03-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/695522摘要：總計畫整合相關環工、化學、化工與材料專家，利用吸收、超重力、觸媒、反應工程等技術，針對二氧化碳之固定/轉化、回收、再利用技術進行研發，以合成高附加價值化學品或燃料。本子計畫四將發展高效率光反應器，進行光催化還原CO2，生成碳氫化合物產物。從能量轉換和環保的觀點而言，利用太陽光能，進行光催化還原CO2，碳源將循環來自CO2，因此不會增加CO2的淨排放，可以根本解決CO2排放和再生能源的問題。本計畫目標有三項，(1)用光纖反應器進行CO2+H2O→CxHy + zO2氣相反應，探討光強度、溫度、CO2及H2O分壓對反應速率的影響，建立反應動力式，以便設計最佳光能效益的反應器；(2)以in situ IR的方式監測CO2、CO及CxHy有機化合物等中間產物，瞭解CO2光催化還原的機理；(3)研發非TiO2新型光觸媒，如Ta2O5，Nb2O5等系列新型光觸媒，用於光纖反應器以提升CO2光催化還原的量子效率(quantum efficiency)。預期完成之工作項目，(1)分析光纖光觸媒薄膜之特性變化，進行SEM、TEM、XPS、XRD和UV-Vis等檢測，包括光觸媒膜厚度、晶相、粒徑等，建立其<br> Abstract: The whole projects group the experts of environment, chemistry, chemical engineering and material to remedy the greenhouse gas, CO2. The objective is to synthesize high-value chemicals or fuel from CO2 using the methods of fixation/conversion, recycle and utilization based on the technology of absorption, high-gravity, catalysis and reaction engineering, etc. This sub-project 4 is to develop a high-performance photo reactor to carry out the photo-reduction of CO2 so that hydrocarbons can be produced. The net emission of CO2 won't increase since carbon is recycled. From the viewpoint of energy and environment, the conversion of CO2 to hydrocarbons by solar energy is the ultimate solution of CO2 emission and renewable energy. Three goals of this sub-project are, (1) A vapor-phase photocatalytic reduction, CO2+H2O→CxHy + zO2, will be engaged in a optical-fiber photo reactor in order to investigate the effects of light intensity, temperature and partial pressures of CO and H2O. A kinetic model will be established to describe the photo reaction; (2) The technique of in situ FTIR will apply to monitor CO, CO2 and CxHy intermediates in order to reveal the mechanism of CO2 photo reduction; (3) Non-titania photo catalysts, such as Ta2O5 and Nb2O5 composite oxides, will be synthesized then apply to the optical-fiber photo reactor in order to increase the quantum efficiency of CO2 photo reduction. The following works will be accomplished, (1) to characterize the photocatalyst, including TiO2 film thickness, crystalline phase, particle size using SEM, TEM, XPS, XRD and UV-Vis in order to correlate the activity and characteristics of photo catalyst; (2) to investigate the optimal conditions of CO2 photo reduction including of light intensity, temperature, partial pressures of CO and H2O, and thickness of catalyst; (3) to apply in situ FTIR in order to reveal the mechanism of photo reduction. The efficiency of CO2 photo reduction can only be enhanced by the improvement of catalyst and reaction conditions. Then the photo reactor would have opportunity to be commercialized.再生能源二氧化碳光催化還原光纖光反應器renewable energyCO2photocatalytic reductionOptical-fiber photo reactor