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| g-C3N4固载磷钨酸催化剂的制备及催化性能 |
| Preparation and catalytic performance of phosphotungstic acid immobilized on g-C3N4 |
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| DOI： |
| 中文关键词: 磷钨酸 g-C3N4 催化剂 酯化 催化性能 生物柴油 |
| 英文关键词:phosphotungstic acid g-C3N4 catalyst esterification catalytic performance biodiesel |
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| 中文摘要: |
| 以磷钨酸（PTA）和g-C3N4为原料，水热法制备g-C3N4固载磷钨酸（PTA/g-C3N4）催化剂。采用红外（FT-IR）、X-射线衍射（XRD）、扫描电子显微镜（SEM）、热重分析仪（TGA）、全自动比表面积及微孔物理吸附仪（BET）对制备的催化剂结构进行分析。将其应用于油酸和甲醇酯化制备生物柴油，以生物柴油收率为指标，考察该催化剂的催化性能。结果表明：PTA成功固载在g-C3N4 表面，固载后的PTA仍具有Keggin结构；在磷钨酸固载量40%、反应时间2 h、反应温度80?℃、醇酸摩尔比10∶?1、催化剂用量7.5%条件下，催化剂的催化性能最好，生物柴油收率达到98.4%。 |
| 英文摘要: |
| Phosphotungstic acid(PTA) immobilized on g-C3N4 as catalyst (PTA/g-C3N4) was prepared via hydrothermal method using phosphotungstic acid and g-C3N4 as raw materials. Also, the structure of the catalyst was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and automatic specific surface area and microporous physical adsorption (BET). Furthermore, the obtained catalyst was applied to the esterification of oleic acid and methanol to prepare biodiesel, and the catalytic performance of the catalyst was studied with the yield of biodiesel as index. The results showed that Keggin structure of PTA active species was still kept after being immobilized on the g-C3N4 surface. Under the conditions of immobilization amount of phosphotungstic acid 40%, reaction time 2 h, reaction temperature 80?℃, molar ratio of methanol to oleic acid 10∶?1 and catalyst dosage 7.5%, the catalyst had the best catalytic performance, and the yield of biodiesel reached 98.4%. |
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