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標題: 大豆油與甲醇製備生質柴油使用MgO/CaO異相觸媒製程探討
Transesterification process of Soybean oil with methanol using heterogeneous MgO/CaO catalysts
作者: 楊政翰
Yang, Cheng-Han
關鍵字: Biodiesel;生質柴油;transesterification;solid base catalyst;CaO;MgO;轉酯化反應;固體鹼催化劑;氧化鈣;氧化鎂
出版社: 化學工程學系所
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本研究採用共沉澱法製備不同煅燒溫度、不同MgO/CaO 莫耳比之非勻相鹼性觸媒,由SEM圖可以知道隨著MgO含量增加,雙成分MgO/CaO的金屬氧化物觸媒顆粒會變小,其顆粒大小會較單成分CaO的顆粒小,而隨著煅燒溫度的增加觸媒的顆粒會越聚集。由XRD圖中可以發現在雙成分MgO/CaO觸媒中並不會產生新的結晶相。由BET的檢測可知單純的CaO比表面積及孔道體積很小,隨著MgO比例的增加比表面積、 孔道體積會有上升的趨勢,隨著煅燒溫度的提升,觸媒越容易燒結在一起造成比表面積、 孔道體積皆下降,觸媒經TPD測試發現添加MgO可以增加CaO的鹼度,且MgO/CaO=3觸媒有最高濃度且較強的鹼性基位在MgO/CaO混合物之間。
在酯化反應中改變不同反應溫度、反應時間、醇油比、含水量、觸媒含量,並重複使用觸媒觀察對產率影響。研究結果顯示,以MgO/CaO 莫耳比為3、煅燒溫度為800℃之觸媒催化能力最高,在反應溫度60℃,反應時間3.5小時,醇油比12,含水量2%,觸媒含量9%,甲酯含量達88%是一個最大的值。

Biodiesel is made from crude or used vegetable oil, or animal fat. Production of biodiesel can use direct mixing method, micro-emulsification, pyrolysis or transesterification method. Advantages of Biodiesel are biodegradable, nontoxic, low pollution of combustion. It can be used alone as a clean alternative fuel or mixed with petroleum diesel as a additive.
In this study, the heterogeneous MgO/CaO base catalyst were prepared by coprecipitation method in different calcination temperatures and MgO/CaO ratios. Investgating the SEM images, it appears that the increase of MgO content can decrease the particle size of the binary MgO / CaO catalyst, and the catalyst particles turn into a cluster at higher calcination temperatures. It has found there is no new crystalline phase formed in the binary MgO / CaO catalyst by the XRD diagram. From the investigation of the BET, surface area and pore volume of CaO is very small. When the MgO content increses, the surface area and pore volume increase, however the calcination temperature increase, the surface area and pore volume of the catalysts decreases. The ratio of MgO / CaO = 3 possesses the highest concentration and a strong alkaline base sites by TPD measurements.
The controlling factors of reaction temperature, reaction time, alcohol-oil ratio, water content, catalyst content, and recyle the catalyst has been used to observe the optimun yield of transesterification reaction. The results show that the MgO / CaO molar ratio of 3, calcined at 800 ℃ had highest catalytic ability of the catalyst. When reaction temperature at 60 ℃, reaction time of 3.5 hours, methanol to oil ratio of 12, the water content of 2%, catalyst content of 9%, the max yield of methyl ester can reach to 88%.
其他識別: U0005-0811201009403900
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