Ir-ReOx/SiO2耦合HZSM-5催化转化生物质原料制备C5/C6烷烃的研究

摘要

在双相体系中以Ir-ReOx/SiO2耦合HZSM-5作为催化剂制备生物汽油,并探究了反应时间、反应温度和氢压等因素对液态烷烃产率的影响,同时还研究了HZSM-5的催化作用和转化过程中的主要反应.实验结果表明:以生物质秸秆为原料,当反应条件为温度170℃、氢压7 MPa时可以得到较高的C5/C6烷烃产率.同时,发现脱水反应是木质纤维素类生物质制备C5/C6烷烃的关键控制步骤;在反应中,相比于其他酸性催化剂,HZSM-5具有适宜的路易斯酸位和勃朗特酸位,还具有特殊的孔道结构,能够富集反应物浓度,表现出较高的催化活性.%Ir-ReOx/SiO2 combined with HZSM-5 was used as catalyst for biogasoline production in the biphasic system.The effects of various parameters such as reaction time,temperature and hydrogen pressure on the yield of biogasoline were investigated.The experiment results show that,when using biomass as substrate,a maximum C5/C6 alkane yield is obtained under the optimal conditions with the reaction temperature being 170 ℃ and hydrogen pressure 7 MPa.In addition,It is found that dehydration reaction is the control step in the experiment.Compared with other catalysts,HZSM-5 has suitable Lewis acid and Bronsted acid,and it has a channel architecture which can increase substrate concentration and thus shows better catalytic activity.