碳基固体酸催化剂的制备及其催化油酸甲酯的合成

Catalytic Synthesis of Methyl Oleate by Carbon Based Solid Acid

摘要:

摘要：采用水热法一步制备葡萄糖-一水合硫酸氢钠-X（Glu-SBM-X）碳基固体酸催化剂，通过调控葡萄糖和一水合硫酸氢钠的质量比可以制备得到不同酸浓度的催化剂。此外，对Glu-SBM-X碳基固体酸催化剂进行了X-射线衍射（XRD）、红外（FT-IR）、扫描电子显微镜（SEM）、热重分析仪（TGA）等表征，证明磺酸基团成功地负载到碳球表面，得到微观结构规整的球形催化剂。将其应用到制备油酸甲酯的酯化反应中，考察了Glu与SBM质量比、反应温度、反应时间、醇油比对油酸转化率的影响，在Glu与SBM质量比为1:4、反应温度为70 ℃、反应5 h、醇油比为10:1时，转化率最高可达到95.20%。该催化剂具有较好的重复利用性能，重复利用四次后油酸的转化率仍可达92.6%。

Abstract:

Abstract: The hydrothermal method was applied to prepare carbon based solid acid catalyst which was named by glucose-sodium bisulfate monohydrate-X（Glu-SBM-X）. The mass ratio of glucose and sodium bisulfate monohydrate was varied to obtain catalysts with different acid concentrations. The catalysts were identified by X-ray diffraction (XRD), fourier transform infrared (FT-IR), scanning electron microscopy(SEM), thermogravimetic analysis (TGA), which proved that the carbonaceous material possesses -SO3H groups. And the neat spherical structure was obtained. The catalytic performances of carbon based solid acid catalysts were carried out in the esterification of oleic acid with methanol. Meanwhile, the effects of the mass ratio of glucose and sodium bisulfate monohydrate, reaction temperatures, reaction time, the molar ratio of methanol and oleic acid on the conversion rate of the oleic acid were performed. The results showed that when the mass ratio of glucose and sodium bisulfate monohydrate was 1:4 and the the molar ratio of methanol and oleic acid was 10:1, the conversion rate of the oleic acid reached 95.20% after conducting the esterification reaction at 70 ℃ for 5 h . The catalyst showed excellent reusability because the conversion rate of the oleic acid remained above 92.6% after reusing for four cycles.