- 學位論文
利用光還原法於CuCrO2擔體上製備奈米金觸媒
Au nanoparticle catalyst prepared by photoreduction on CuCrO2 nanopowder
摘要
本實驗利用光還原的方式以CuCrO2奈米粉末作為擔體黏附奈米金粒子以合成金觸媒，以X光繞射及電子顯微鏡的檢測來探討Au/CuCrO2的特性，並以示差掃描熱卡計測定奈米金觸媒的催化活性。將CuCrO2奈米粉末與四氯金酸加入水中，利用氨水調整前驅溶液的酸鹼值，再放進光催化槽中光照後，離心乾燥，再將所得粉末經退火處理形成奈米金觸媒。XRD及TEM觀察顯示成功地在CuCrO2擔體上黏附平均粒徑3.2 nm的金奈米粒子，利用熱示差掃描卡量計測試發現Au/CuCrO2觸媒於反應溫度100°C時可吸附一氧化碳發生反應，前驅溶液越偏鹼性吸熱峰越明顯，其中以前驅液pH10所合成之奈米金觸媒催化效果最佳，熱能差值為1.008 mW/mg。利用傅立葉紅外線轉換光譜儀測量發現波長1740 cm-1附近出現醛基C=O雙鍵的官能基吸收位置，可證明苯甲醇經Au/CuCrO2觸媒催化後部分氧化成苯甲醛。
並列摘要
Gold catalysts supported on CuCrO2 nanopowder were prepared by photodeposition method. The Au/CuCrO2 catalyst was characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (TEM). The catalyst activity was measured by differential scanning calorimeter (DSC). CuCrO2 nanopowder and HAuCl4 solution were mixed as precursor solutions, the solution were dried in desiccator after irradiation. Au/CuCrO2 samples were annealed at 300oC for 4 hours and stored in the desiccators for catalytic measurement. In this study, gold catalyst supported successfully on CuCrO2 nanopowder, XRD pattern showed that typical peaks of gold and CuCrO2 supports are easily observed. TEM image showed that the grain size of gold particle is about 3.2 nm on CuCrO2 supports. According to the DSC measurement, Au/CuCrO2 catalyst may react with carbon monoxide as the reaction temperature at 100°C. FT-IR spectrum shows the wavelength of 1740 cm-1 appears aldehyde C=O function group absorption, the result can prove that Au/CuCrO2 catalyst make benzyl alcohol partial oxide into benzaldehyde.