| 亚/超临界甲醇体系中磷钼酸催化液化木粉 |
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| 引用本文： | 曾常伟,林星,汪雪琴,蔡政汉,吕建华,黄彪.亚/超临界甲醇体系中磷钼酸催化液化木粉[J].福建农林大学学报(自然科学版),2016(3):349-355. |
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| 作者姓名： | 曾常伟 林星 汪雪琴 蔡政汉 吕建华 黄彪 |
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| 作者单位： | 福建农林大学材料工程学院,福建 福州,350002 |
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| 基金项目： | 教育部高等学校博士学科点专项科研基金资助项目(20123515110015)；福建省科技重大专项资助项目(2014NZ003) |
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| 摘 要： | 以杉木屑为原料,研究磷钼酸在亚/超临界甲醇条件下的催化液化性能,并探讨反应温度、反应时间、催化剂用量和杉木屑用量对杉木屑液化率的影响.结果表明该磷钼酸在亚/超临界甲醇条件下具有很好的催化液化性能.在150 m L甲醇、0.5 g催化剂、1 g杉木屑、240℃条件下反应30 min,液化率达到93.32%.采用SEM、FT-IR和GC-MS对液化残渣、轻油和重油进行表征.结果表明,残渣主要是由木质素或木质素衍生物组成;而液化产物轻油主要是由酯类、酚类、醛类、酮类等组成,主要是由纤维素及半纤维素与甲醇反应得到;而液化产物重油中的酚类物质主要是由木质素液化反应得到.
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| 关 键 词： | 甲醇 亚/超临界 磷钼酸 杉木屑 液化 |
Catalytic liquefaction of wood in sub/supercritical methanol under phosphomolybdic acid |
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| Abstract: | To discover bio-environmental and sustainable catalyst to effectively transform fir sawdust to biofuel, liquefaction process catalyzed by phosphomolybdic acid and using sub/supercritical methanol as solvent was evaluated. The optimum reaction condition was investigated in terms of temperature, duration, dosages of catalyst and sawdust. Results showed that phosphomolybdic acid to-gether with subcritical methanol significantly accelerated sawdust liquefaction. The optimum reaction condition was achieved at liquif-ying 1 g sawdust, 150 mL methanol and 0.5 g phosphomolybdic acid at 240℃ for 30 minutes, maximizing at 93.32%. Subsequent-ly, quantity and chemical composition of light bio-oil, heavy bio-oil and residue were characterized by scanning electron microscope, Fourier translation infrared spectrum and gas chromatography-mass spectrometer. Results showed that the residue was mainly consist of lignin and its derivatives, which was from the liquefaction of lignin from methanol. Light bio-oil obtained at optimum condition comprised of complex compounds such as ester, phenol, aldehyde and ketone, resulting from the reaction between cellulose and methanol. While, heavy bio-oil, mainly comprised of phenol, was obtained from lignin liquefaction. |
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| Keywords: | methanol sub/supercritical phosphomolybdic acid fir sawdust liquefaction |
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