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中南大学学报(自然科学版)

Journal of Central South University

第42卷    第5期    总第201期    2011年5月

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文章编号:1672-7207(2011)05-1226-06
采用固体磷钨酸铯盐催化光皮树油制备生物柴油
李念,钟世安

(中南大学 化学化工学院,湖南 长沙,410083)

摘 要: 合成3种固体磷钨酸铯盐CsxH3-xPW12O40(x=2.0, 2.5, 3.0),并采用FT-IR,XRD和BET手段分别对其进行表征。以CsxH3-xPW12O40(x=2.0, 2.5, 3.0)为固体催化剂,催化光皮树油与甲醇制备生物柴油,考察这3种不同的催化剂在相同的反应温度、反应时间、醇油摩尔比、催化剂质量分数等因素下对生物柴油转化率的影响。研究结果表明:与催化剂Cs2HPWl 2O40和Cs3PWl 2O40相比,Cs2.5H0.5PWl 2O40具有较强的催化活性,其在反应温度为65 ℃、反应时间为20 h、醇油摩尔比为9׃1、催化剂质量分数为2.8%时光皮树油转化成生物柴油的转化率可达91.0%;高比表面和超强酸性的固体磷钨酸铯盐不受光皮树油中游离脂肪酸和水分的影响,易分离,可重复使用,是制备生物柴油的绿色环保型固体催化剂。

 

关键字: 固体磷钨酸铯盐;固体催化剂;生物柴油;光皮树油;酯交换

Preparation of biodiesel from Cornus wilsonian oil catalyzed by
solid cesium phosphotungstates
LI Nian, ZHONG Shi-an

School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract:Solid cesium phosphotungstates CsxH3-xPW12O40(x=2.0, 2.5, 3.0) were synthesized and characterized by FT-IR, XRD and BET techniques. CsxH3-xPW12O40(x=2.0, 2.5, 3.0) were used as a solid catalyst for the production of biodiesel from Cornus wilsoniana oil with methanol respectively. The three catalysts were compared under the same conditions of reaction temperature, reaction time, molar ratio of methanol to oil and catalyst dosage on the conversion rate of Cornus wilsoniana oil. The results show that Cs2.5H0.5PW12O40 has higher catalytic activity than Cs2HPWl 2O40 and Cs3PWl 2O40. The conversion of Cornus wilsoniana oil can be up to 91% under the reaction condition of molar ratio of methanol to oil 9:1, catalyst dosage 2.8%, temperature 65 ℃, reaction time 20 h by the catalyst of Cs2.5H0.5PW12O40. Solid cesium phosphotungstates of high surface area and the most acid strength are not affected by free fatty acid content and moisture in Cornus wilsoniana oil. Furthermore, they can be separated from the biodiesel easily and can be used repeatedly. Therefore, solid cesium phosphotungstates are green environmental protection solid catalysts for the production of biodiesel.

 

Key words: solid cesium phosphotungstate; solid catalyst; biodiesel; Cornus wilsoniana oil; transesterification

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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