基于纤维素的固体酸催化剂的制备及其催化高酸值废油脂生产生物柴油

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中文摘要：以廉价的纤维素为原料,经不完全炭化和磺化制得含高密度(1.69 mmol/g) SO3H基团的固体酸催化剂Cellulose-SO3H.结果表明,该催化剂适宜的制备条件为:在400℃炭化15h,再在150℃磺化15h.所得催化剂在油酸与甲醇的酯化反应中表现出明显高于其它几种典型固体酸催化剂(铌酸,Amberlyst- 15,硫酸化氧化锆)的活性,同时还能高效地催化棕榈酸或硬脂酸以及高酸值废油脂(较多脂肪酸)与甲醇的酯化反应.在醇/油摩尔比为25,催化剂用量为10％(基于废油脂的质量),于85℃反应10h的条件下,生物柴油收率约为95％,明显高于上述三种典型固体酸催化剂.连续使用30批次(每批次10 h)后,Cellulose-SO3H仍能保持初始催化活性的90％以上,表现出极好的操作稳定性.可见,所制Cellulose-SO3H催化剂在生物柴油领域具有较好的应用潜力.

外文标题：Preparation of Cellulose-Derived Solid Acid Catalyst and Its Use for Productionof Biodiesel from Waste Oils with High Acid Value

外文摘要：A cheap cellulose-derived solid acid catalyst (Cellulose-SOjH), containing SO3H groups (1.69 mmol/g), was successfully prepared through sulfonation of incompletely carbonized cellulose. Various preparation variables exerted remarkable effects on the catalytic activity of the prepared catalyst, and the optimal preparation conditions were found as follows: carbonization at 400 ℃ for 15 h and subsequent sulfona tion at 150 ℃ for 15 h. The resulting catalyst showed significantly higher activity for esterification of oleic acid with methanol than several typical solid acid catalysts (niobic acid, amberlyst-15, and sulfated zirconia). The Cellulose-SO3H catalyst was capable of efficiently cata lyzing esterification of other higher fatty acids (palmitic acid and stearic acid) with methanol to the corresponding fatty acid methyl esters (biodiesel). Moreover, the conversion of waste oils containing 27.8% free fatty acids to biodiesel catalyzed by Cellulose-SOsH was investi gated. It was found that the optimal molar ratio of methanol to oil, catalyst amount, reaction temperature, and reaction time were 25, 10% (based on the mass of waste oil), 85 ℃, and 10 h, respectively. Under the optimal reaction conditions, the yield of biodiesel obtained cata lyzed by Cellulose-SO3H was much higher than that by the above-mentioned three typical catalysts. Cellulose-SChH still retained above 90% of its original catalytic activity even after 30 cycles of successive re-use, indicating excellent operational stability. It can be clearly seen that the Cellulose-SO3H catalyst displays tremendous potential for biodiesel production.

外文关键词：

cellulosesolid acid catalystbiodieselesterificationwaste oil

作者：

娄文勇、蔡俊、段章群、宗敏华

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作者单位：

华南理工大学轻工与食品学院,广东广州510640

湖北工业大学发酵工程省部共建教育部重点实验室,湖北武汉430068

关键词：

纤维素固体酸催化剂生物柴油酯化废油脂

基金：

国家自然科学基金广东省科技计划项目华南理工大学中央高校基本科研业务费华南理工大学中央高校基本科研业务费华南理工大学中央高校基本科研业务费华南理工大学中央高校基本科研业务费教育部新世纪优秀人才支持计划

项目编号：

210720652009B0308010042011ZG00182009ZZ00262009ZM01992009ZZ0018NCET-10-0367

出版年：

2011

DOI：

10.3724/SP.J.1088.2011.10711

催化学报

中国化学会中国科学院大连化学物理研究所

催化学报

CSTPCDCSCD北大核心SCI

影响因子：1.269

ISSN：0253-9837

年,卷(期)：2011.32(11)

被引量19
参考文献量21