Study on Liquid Phase Photocatalytic Reduction of Carbon Dioxide: Evaluation on Reducing Agents, Photocatalytic Materials and Selectivity
|摘要:||溫室CO2 氣體捕獲與儲存技術(CCS)已被IPCC 評估為可行之技術，而CO2
其做為吸收液兼CO2 還原劑，將可有效整合捕獲-還原兩個CO2 處理流程。而只
有在太陽光下具備光催化還原CO2 之光觸媒，方可避免為了還原CO2 卻消耗更
The CO2 capture and storage (CCS) has been evaluated by the IPCC as a feasible CO2 mitigation option. The reduction of CO2 could provide another alternative other than the storage of CO2 in underground or deep ocean by producing economical chemicals or new energy sources. The photocatalytic reduction of CO2 is mostly affected by the photocatalyst and the reducing agent. Water is the ideal reductant, however, CO2 is not very soluble in water and the redcing ability of water is poor. Therefore other absorbents and reducing agents such as NaOH and 2-propanol were employed in many studies to facilitate the CO2 reduction reaction. However the CO2 reduction process from flue gas could become economical only by combining it with the CO2 capture technology and by the use of photocatalyst which can make full use of solar energy. In this three-year project, we intend to evaluate effects of reducing agents and the photocatalysts on the CO2 reduction ability and the selectivity of the reduction products as well. During the first year study, the possibility of using the most readily available CO2 absorbents of amines and ammonia as the reducing agents will be evaluated. And for the second year project the main objective is to modify the metal-TiO2 photocatalysts which can maximize the usage of field solar light. The mechanisms that govern the selectivity of the prodcut is also studied. At the end of the third year, we expect to make the composite of visible light photocatalyst into single photocatalytic material which pore sizes can be manipulated and the selectivity of the product can be well controlled.