2005-01-012024-05-15https://scholars.lib.ntu.edu.tw/handle/123456789/665349摘要：太陽能是地球生物的終極能源，植物光合作用從古到今提供或儲存人類絕大多數使用的化石能源，本研究構想在92年度能源計畫已執行以TiO2光觸媒進行光催化還原CO2生產碳氫化合物，結果在水溶液中，通入CO2，以紫外光照射進行光催化反應，成功地將CO2轉成甲醇，是模擬植物光合作用，具有再生能源和降低CO2的優點。93年度進一步改良，已成功將Cu/TiO2覆膜在石英光纖上，也完成組裝光纖反應器，使光能可以均勻的傳遞分散至反應器內，能充分利用光能，解決在傳統填充床式反應器，光能無法穿透深部光觸媒的問題。本計畫一年的目標，(1)用光纖反應器進行CO2+H2O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，瞭解光催化還原的機理，從根本改良光觸媒和反應條件的控制操作，以提升CO2的光催化還原的量子效率；(3)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，建立其活性與光催化之關係。從技術角度、經濟層面或環保的觀點，人工光合<br> Abstract: Solar energy is the ultimate energy source for all life in earth. The photosynthesis of plant provides most of the human energy now and stored energy as fossil fuel long time ago. Previous project (Year 2003) reported that catalytic photo-reduction of CO2 can generate hydrocarbons in aqueous solution under UV irradiation, that is, mimic to photosynthesis. It has the advantages of both renewable energy and CO2 remedy. In 2004, a TiO2 optical-fiber photo reactor was assembled and showed that the advantage of optical-fiber can evenly distributed the photon throughout the whole reactor. Thus light energy can be fully utilized for preliminary CO2 photo reduction resulting in a better solution than a packed-bed design. The research in year 2005 are to (1) carry out a vapor-phase CO2 + H2O photocatalytic reduction in the optical-fiber photo reactor in order to investigate the effects of light intensity, temperature and partial pressures of CO and H2O, then derive a kinetic model to develop an optimum photo reactor; (2) measure the CO, CO2 and CxHy intermediate compounds in situ by FTIR in order to reveal the mechanism of CO2 photo reduction so that quantum efficiency can be improved by modifying catalysts and reaction condition; (3) characterize the photocatalyst, including TiO2 film thickness, crystalline, particle size..etc using SEM, TEM, XPS, XRD and UV-Vis in order to correlate the activity and characteristics of photo catalyst. From the perspective of technology, economy and environment, artificial photosynthesis is a permanent solution for renewable energy. It is feasible and worth to explore.再生能源二氧化碳光催化還原二氧化鈦光纖光反應器renewable energyCO2photocatalytic reductionTiO2Optical-fiber photo reactor