中文摘要
本研究係有關鎢酸鈷/氧化銫鎢(CoWO4/CsxWO3-H)複合奈米粒子之製備及觸媒應用，利用兩步驟溶熱法與及後續在600oC氫/氬(5/95)混合氣氛中的鍛燒，可成功製得鎢酸鈷/氧化銫鎢複合奈米粒子。由於兼具氧化銫鎢在近紅外光波段優異的光熱轉換特性及鎢酸鈷的觸媒特性，本研究將所得鎢酸鈷/氧化銫鎢複合奈米粒子作為具近紅外光與太陽光光熱增強性能之觸媒，用於對硝基苯酚之硼氫化鈉催化還原。探討對硝基苯酚濃度、觸媒使用量、及反應溫度對催化反應的影響，發現其擬一階速率常數隨著反應溫度與觸媒使用量增加而增加，但隨著對硝基苯酚濃度之增加而減少，得知其活化能為23.9 kJ/mol且反應為擴散控制。此外，在近紅外光或太陽光照射下，反應速率皆可因溶液溫度之上升而顯著提高，顯示所得觸媒擁有良好的光熱轉換能力，可藉照射太陽光而提高其性能，證實具有很高的應用潛力。

Abstract
This thesis concerns the preparation and catalytic application of cobalt tungstate/cesium tungsten oxide (CoWO4/CsxWO3-H) composite nanoparticles, which could be synthesized successfully via two-step solvothermal process and the followed calcination in H2/Ar (5/95) atmosphere at 600oC. Because they possessed the excellent NIR photothermal conversion property of cesium tungsten oxide and the catalytic properties of cobalt tungstate, the resulting CoWO4/CsxWO3-H composite nanoparticles were utilized as the catalyst with near-infrared (NIR) and sunlight photothermally enhanced performance for the catalytic reduction of 4-nitrophenol (4-NP) with sodium borohydride in this study. From the investigations on the effects of 4-NP concentration, catalyst amount, and reaction temperature, it was found that the corresponding pseudo-first-order rate constant increased with the increase of temperature and catalyst amount while decreased as the concentration of 4-NP increased. This revealed that the reaction had an activation energy of 23.9 kJ/mol and was diffusion-controlled. Furthermore, under NIR or sunlight irradiation, the reaction rate could be enhanced significantly owing to the increase of solution temperature. This revealed that the resulting catalyst possessed good photothermal conversion capability and its performance could be enhanced by the irradiation of sunlight. It was demonstrated to have great potential in practical application.

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