本研究以化學還原法製備奈米NiB、CoB 及NiCoB 合金觸媒，
探討觸媒於檸檬醛之選擇性氫化行為，瞭解觸媒製備、反應溶劑(乙
醇、環己烷、正己烷)及促進劑對反應活性及選擇性之影響。
以NiB 為觸媒，鹽類選取以醋酸鎳最佳，反應溶劑以乙醇反應
活性最佳、環己烷次之、正己烷最差。NiB 觸媒不論催化活性或產
物選擇性皆明顯優於倫尼鎳觸媒，其中P-2WNiB 觸媒反應活性是
P-1NiB 的2.1 倍。NiB 觸媒之檸檬醛氫化反應路徑，皆優先選擇氫
化共軛C=C/C=O 中的C=C 鍵成香茅醛，再氫化共軛C=O 鍵成香茅
醇。以P-2WNiB 為觸媒，香茅醇會繼續氫化成全氫化產物3,7-二甲
基-辛醇，以P-1NiB 為觸媒，僅生成少量的全氫化產物。
NiB 觸媒的溶劑明顯影響反應活性與選擇率，以乙醇為檸檬醛
氫化反應溶劑時，明顯使反應速率加快。P-1NiB 觸媒，反應一小時
之轉化率相對大小為乙醇(2.1)＞環己烷(1)＞正己烷(0.6)。使用環己
烷為反應溶劑，幾無全氫化產物；使用乙醇溶劑時，則有微量的全
氫化產物產生。P-2WNiB 觸媒，不論使用環己烷或乙醇為反應溶劑，
皆不影響產物的分佈，唯使用乙醇溶劑時，反應速率加快。
添加鉻、釷、鎢促進劑於P-1NiB 觸媒中皆顯著促進反應活性，
其中又以鉻的促進效果最佳。反應一小時之轉化率相對大小為
10%Cr-NiB(4.7)＞10%Th-NiB(3.9)＞5%W-NiB(2.8)＞P-1NiB(1)。在
中轉化率下，對主產物香茅醛之選擇率影響不大，在高轉化率下，
產物分佈則有明顯差異。添加鉻、釷、鎢促進劑，香茅醇會快速氫
化成全氫化產物。
以CoB 為觸媒，鹽類選取以醋酸鎳最佳，反應溶劑以乙醇反應活性最佳、環己烷次之、正己烷最差。CoB 觸媒不論催化活性或產物
選擇性皆明顯優於倫尼鈷觸媒，其中P-2WCoB 觸媒反應活性是
P-1CoB 的1.7 倍。CoB 觸媒之檸檬醛氫化反應路徑不同於NiB 觸媒，
皆優先選擇氫化共軛C=C/C=O 中的C=O 鍵成橙花醇與香葉醇，再氫
化共軛C=C 鍵成香茅醇，反應過程幾無全氫化產物，反應過程僅少
量香茅醛的生成。
CoB 觸媒的溶劑明顯影響反應活性，對選擇率的影響較小，以乙
醇為反應溶劑，反應速率明顯增快，以正己烷為反應溶劑，反應速率
反而下降。P-1CoB 觸媒，反應一小時之轉化率相對大小為乙醇(5.5)
＞環己烷(1)＞正己烷(0.2)。P-1CoB 觸媒，使用乙醇為反應溶劑，幾
無全氫化產物，且僅有微量的香茅醛(＜3%)產生；使用環己烷溶劑
時，有相當量的香茅醛(10%)產生。
在P-1CoB 觸媒中，添加氧化鎢有較顯著的促進效果，添加氧化
釷與氧化鉻則幾無促劑效果。促進劑的氫化路徑皆與CoB 觸媒相同，
且最後只停留在香茅醇產物。添加鉻、釷促進劑，不影響橙花醇與香
葉醇之選擇率，添加鎢促進劑，使橙花醇與香葉醇之選擇率略降低。
NiCoB 雙金屬觸媒在與NiB 相同的反應條件下檸檬醛氫化活性
明顯優於NiB 觸媒，且Ni0.7Co0.3B 觸媒之氫化活性是NiB 的1.5 倍。
CoB 的存在使NiB 更具催化活性，NiB、CoB 並非獨自扮演催化角色，
NiB 與CoB 必然產生交互作用。

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