本研究主要探討觸媒還原高濃度的硝酸鹽溶液，利用硼氫化鈉伴隨著氧化銅硝酸鹽進行還原，並探索其反應路徑及動力學。
結果顯示，藉由使用硼氫化鈉及氧化銅可在兩小時內有效還原硝酸鹽。另外，當假設亞硝酸為中間產物以及氨氣和氮氣為最終產物，反應動力學可成功擬合。活化能(25.65 kJ mol-1)指出本硝酸還原反應主要為化學反應控制。硼氫化鈉及氧化銅在硝酸還原反應中皆扮演重要的角色。增加硼氫化鈉的劑量對硝酸還原速率沒有顯著的影響，但增加對氮氣的選擇性。而增加氧化銅的劑量，則增加對氨氣的選擇性。由硼氫化鈉所產生的零價銅，其表面的活性位置明顯地影響硝酸鹽之還原速率。與不同的觸媒做比較，像是氧化亞銅及銅粉，使用氧化銅之硝酸還原效率是最好的。

Catalytic reduction of concentrated nitrate solution was examined in this study. In this study, sodium borohydride (NaBH4) and copper oxide (CuO) were used to reduced nitrate, and the reaction pathway and reaction kinetics were explored.
Results showed that effective reduction of nitrate by using NaBH4 in the presence of CuO was observed within 2 hours. Furthermore, reaction kinetics could be fitted well by kinetic model in which nitrite was the reaction intermediate and ammonia and nitrogen were end-products. Activation energy (Ea) of 25.65 kJ mol-1 was found, which indicated that nitrate reduction was chemical reaction controlled. Both NaBH4 and CuO played important roles in the nitrate reduction. Increasing NaBH4 dose had not significantly effect on the rate of nitrate reduction, but it would increase selectivity to N2, while increasing CuO dose would increase selectivity to NH3. The rate of nitrate reduction was significantly affected by the active site on Cu0 surface, which was reduced by NaBH4. Compared with different catalysts, such as Cu2O and Cu, the efficiency of nitrate reduction by using CuO as catalyst was the best.

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