K_2SiO_3_C颗粒催化大豆油酯交换制备生物柴油_英文

2011

文章编号: 0253-9837(2011)10-1592-05

Chinese Journal of Catalysis

国际版DOI: 10.1016/S1872-2067(10)60265-3

Vol. 32 No. 10

研究论文: 1592~1596

K2SiO3/C 颗粒催化大豆油酯交换制备生物柴油

王建勋 1, 陈洸艟 2, 陈锦章 1,*

1

台中教育大学科学应用与推广学系, 台湾台中 40306

2

明新科技大学自然科学教学中心, 台湾新竹 30401

摘要: 采用浸渍法将钾水玻璃负载于碳颗粒 (粒径 1~3.5 mm) 上, 经 120 °C 烘干后制得 K2SiO3/C 催化剂. 以 X 射线衍射、扫瞄电镜-能量色散 X 射线与 Hammett 指示剂等方法对样品进行了表征. 以 K2SiO3/C 为催化剂, 大豆油为原料, 进行酯交换反应制备生物柴油, 考察了催化剂用量、醇/油摩尔比、反应时间 (微波与传统加热) 等因素对大豆油酯交换率的影响. 当醇/油摩尔比 30:1, 催化剂用量 24 wt% 时, 传统加热反应于 2.5 h 达到 96.5% 酯交换率, 而相同条件下微波加热反应于 1.5 h 达到 96.7% 酯交换率.

关键词: 生物柴油; 固体催化剂; 钾水玻璃; 碳颗粒; 微波吸收 中图分类号: O643 文献标识码: A 收稿日期: 2011-05-27. 接受日期: 2011-07-26.

*通讯联系人. 电话: (886)-4-22183406; 传真: (886)-4-22183560; 电子信箱: ccchen@ms3.ntcu.edu.tw 基金来源: 台湾”国家”科学委员会 (NSC99-2622-M-42-001-CC1).

本文的英文电子版(国际版)由Elsevier出版社在ScienceDirect上出版(/science/journal/18722067).

Biodiesel Production from Soybean Oil Catalyzed by K2SiO3/C

WANG Jianxun1, CHEN Kungtung2, CHEN Chiingchang1,*

1

Department of Science Application and Dissemination, National Taichung University of Education, Taichung 40306, Taiwan, China

2

The Teaching Center of Natural Science, Minghsin University of Science and Technology, Hsinchu 30401, Taiwan, China

Abstract: A solid base catalyst (K2SiO3/C) capable of microwave absorption was used for the transesterification of soybean oil under mi-crowave radiation. The K2SiO3/C catalyst was prepared by an impregnation method that loaded K2SiO3 on carbon particles (1–3.5 mm di-ameter) followed by drying at 120 °C. The catalysts were characterized by X-ray diffraction, scanning electron microscopy- energy disper-sive spectrometry, and the Hammett indicator method. K2SiO3 was well distributed on the support. The effects of reaction variables such as catalyst loading, molar ratio of methanol to oil, and reaction time (under microwave radiation and conventional heating) were studied. When the conventionally heated reaction was carried out at 65 °C with a methanol/oil molar ratio of 30:1 and a catalyst concentration of 24 wt%, the biodiesel conversion was 96.5% after 2.5 h reaction time. The same reaction reached equilibrium after 1.5 h under microwave radiation, and the conversion of biodiesel was 96.7%.

Key words: biodiesel; solid catalyst; potash water glass; carbon particle; microwave absorption

Received 27 May 2011. Accepted 26 July 2011.

*Corresponding author. Tel: +886-4-22183406; Fax: +886-4-22183560; E-mail: ccchen@ms3.ntcu.edu.tw This work was supported by the “National” Science Council of Taiwan (NSC99-2622-M-42-001-CC1).

English edition available online at Elsevier ScienceDirect (/science/journal/18722067).

Global warming due to the heavy consumption of fossil resources and the depletion of natural resources is of in-creasing concern, and for sustainable development, bio-diesel is of increasing attention as a source of renewable energy. The most common way to produce biodiesel is by transesterification. Although transesterification is relatively fast and has high conversions in homogeneous catalyst sys-tems, these have some serious drawbacks [1] such as that the catalyst cannot be recovered and must be neutralized, and the separation of fatty acid methyl esters (FAME) from