油價的高漲，環保意識的抬頭，發展新型態且乾淨的替代能源成為全世界的首要目標。就目前發展的生質能而言，生質柴油能以回收的廢食用油進行生產，且具有生物可分解性、不含硫、無苯環化合物、燃燒排放物質較無污染，是一種兼顧環保並可永續經營的能量來源。

本研究主要先由各種觸媒進行轉酯化反應，嘗試找出具有發展潛力之觸媒，經實驗評估後選定CsF/α-Al2O3為本研究主要探討之觸媒，再以各種方法嘗試提高轉酯化反應之轉化率。

為了減少質傳阻力對實驗的影響，進行轉速探討；為了增加觸媒活性，改變含浸在載體上的量、觸媒載體與鍛燒溫度；醇油比的大小與觸媒添加比例亦為影響反應轉化率的關鍵因素。經實驗結果歸納得到：4.0 mmol CsF/g γ-Al2O3對轉酯化反應於60 ℃進行，醇油比12:1，轉速400 rpm，觸媒添加量8 %為較佳的反應條件，當反應進行1小時，轉化率達91%。但在觸媒重複使用性上，觸媒僅能使用一次，是此觸媒應用在轉酯化反應上的限制。

觸媒具有反應性之原因是由於CsF與γ-Al2O3共同存在時，含浸鍛燒後產生具催化能力的活性位置，以純CsF作為觸媒進行反應，不具催化能力，因此無法產生任何的甲基酯。

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