稻壳炭基固体酸催化酯化反应制备生物柴油研究  

Carbon-based solid acid prepared from rice husk char for biodiesel production by catalytic esterification

作　　者：许洪瀚 黄芙蓉 童冬梅[2] XU Hong-han;HUANG Fu-rong;T0NG Dong-mei(College of Chemistry,Sichuan University,Chengdu 610064,China;Shishi Shudu High School of Chengdu,Chengdu 611730,China)

机构地区：[1]成都石室蜀都中学,四川成都611730 [2]四川大学化学学院,四川成都610064

出　　处：《化学研究与应用》2018年第3期363-369,共7页Chemical Research and Application

摘　　要：以热解稻壳炭为原料制备了SH系列炭基固体酸,以月桂酸和甲醇的酯化反应为探针反应,探讨了制备条件和反应条件对炭基固体酸的催化活性的影响。采用XRD、FTIR、BET、NH_3-TPD和元素分析等手段对催化剂进行了表征。结果表明,键合在无定型的多环芳烃炭层上的磺酸基(–SO_3H)提供了炭基固体酸表面的主要酸中心。以浓硫酸为磺化试剂,磺化4 h制得的SH-4h炭基固体酸表面酸密度最大,表现出最佳的催化酯化反应活性,在精馏分水—连续酯化反应装置中反应4 h,甲酯收率即可达到99.7%,且SH-4h炭基固体酸具有良好的稳定性。A series of carbonbased solid acid catalysts were prepared from rice husk char and applied in the esterification of lauric acid and methanol.The influences of preparation parameters and reaction conditions on the catalytic activity of carbonbased solid acids for the esterification of lauric acid were investigated.XRD,FTIR,BET,NH3TPD and elemental analysis were used to characterize the catalysts.The results showed that the-SO3 H groups bonded with amorphous carbon consisting of polycyclic aromatic carbon sheets supplied the predominant surface acid sites on the catalysts.SH4h carbonbased solid acid,prepared by the sulfonation in concentrated H2 SO4 as sulfonating agent for 4 h,had the highest surface acid density and then exhibited the best catalytic activity for the esterification.The yield of methyl laurate reached 99.7%when the esterification was carried out in continuous esterification apparatus with a rectifying column for 4 h.SH-4h catalyst also exhibited good stability.

关 键 词：稻壳炭 炭基固体酸 生物柴油 催化酯化 

分 类 号：O643.3[理学—物理化学]