桐壳灰固体碱催化剂的制备及其催化桐油甲酯化（英文）

Prepration of Solid Base Catalyst Added with Tung Shell Ash and Its Application in Methyl Esterification of Tung Oil

以KOH和Al_2O_3联合桐壳灰制备了固体碱催化剂(KOH-TSA-Al_2O_3),并将其用于催化桐油甲酯化。采用单因素及正交试验,以桐油甲酯化过程中桐油的转化率为指标,考察了催化剂KOH用量、烧结温度及桐壳灰添加量对甲酯化的影响,结果表明:当KOH用量为6 g、Al_2O_3用量为4 g、桐壳灰分添加量为3 g,烧结温度700℃下煅烧10 h制备的固体碱催化剂催化桐油甲酯化效率最高,为76.34%。对得到的固体碱催化剂进行碱量、SEM及XRD分析,结果显示该固体碱催化剂表面为树状多枝结构;加入桐壳灰后,该催化剂产生CaO、MgO和SiO_2等新相。与0~#柴油相比,该催化剂催化下制备的生物柴油具有更优良的性能。

Solid catalyst added with tung shell ash （KOH-TSA-AAl2O3 ） was prepared using Al2O3 and KOH as raw materials. The catalyst was used in the process of methyl esterification of tung oil. Its catalysis efficiency was analyzed. Effects of KOH dosage, sintering temperature and tung shell ash dosage on the conversion efficiency of tung oil were studied with the solo conditions experiment and orthogonal design. The final results showed that the efficiency of methyl esterification catalyzed by the optimized solid catalyst was up to 76. 34%, under the conditions of 6 g KOH, 4 g Al2O3 , 3 g tung shell ash, and 700 ℃ for 10 h. The prepared catalyst was analyzed with alkalinity detected, scanning electron microscope （SEM） and X-ray diffraction （XRD）. The results showed that the surface catalyst was like tree branch and new phase of CaO, MgO and SiO2 was generated. Compared with 0^# diesel standard in China, the biodiesel prepared under the catalyst was showed better quality.