负载Pt催化生物柴油加氢脱氧性能研究  

Research on the catalytic performance of supported Pt catalyst for hydrodeoxygenation of biodiesel

作　　者：欧阳仟 杨妮 姚静雯 黄进 张怡[1] 刘学军[1] OUYANG Qian;YANG Ni;YAO Jing-wen;HUANG Jin;ZHANG Yi;LIU Xue-jun(Zhejiang Provincial Key Laboratory of Biofuel Utilization Technology,Biodiesel Laboratory of China Petroleum and Chemical Industry Federation,School of Chemical Engineering, Zhejiang University of Technology,Hangzhou 310014,China;Zhejiang Pharmaceutical Co.,Ltd.Changhai Biological Division,Shaoxing 312000,China)

机构地区：[1]浙江工业大学浙江省生物燃料利用技术研究重点实验室,石油和化工行业生物柴油技术工程实验室化学工程学院,浙江杭州310014 [2]浙江医药股份有限公司昌海生物分公司,浙江绍兴312000

出　　处：《燃料化学学报》2018年第10期1202-1209,共8页Journal of Fuel Chemistry and Technology

摘　　要：采用XRD、BET、SEM、NH_3-TPD对Pt/Al_2O_3、Pt/Al_2O_3-ZSM-5、Pt/ZSM-5催化剂进行表征,在不同反应工艺条件下考察三种分子筛的酸性、孔径分布、外部形貌、晶体结构对其加氢脱氧性能的影响。结果表明,Br■nsted酸性位点和中孔体积占比对脂肪酸甲酯的加氢脱氧反应来说至关重要,其中,Br■nsted酸性位点在脱氧反应中的C-O键断裂发挥主要作用,中孔孔径则能提高整个反应的质量传递效率以及避免C_(12-18)长链烷烃发生裂解。三种催化剂的加氢脱氧催化效果大小为:Pt/Al_2O_3-ZSM-5>Pt/Al_2O_3>Pt/ZSM-5;适宜的反应工艺条件为:t=350℃,p=2 M Pa,H2/oil=1000,WHSV=0.5 h^(-1),在此条件下Pt/Al_2O_3-ZSM-5的脂肪酸甲酯转化率为99.4%,目标产物液体收率为86.8%。The Pt/Al 2O 3,Pt/Al 2O 3-ZSM-5 and Pt/ZSM-5 catalysts were prepared and characterized by XRD,BET,SEM and NH 3-TPD.The effects of crystal structure,acidity,pore size distribution and external shape of the three catalysts on the hydrodeoxygenation of fatty acid methyl esters were investigated under different reaction conditions.The results show that the Br nsted acidic sites and proportion of mesoporous volume were critical for the hydrodeoxygenation of fatty acid methyl esters.The Br nsted acidic site plays a major role in the C-O bond breakage of deoxygenation reaction,the mesopores improved the mass transfer efficiency of the entire reaction and avoided cracking of C 12-18 long chain alkanes.The hydrodeoxygenation activity of the three catalysts were as follow:Pt/Al 2O 3-ZSM-5>Pt/Al 2O 3>Pt/ZSM-5.The optimal reaction conditions were as follow:t=350℃,p=2 MPa,H 2/oil=1000,WHSV=0.5 h-1.Under the optimal reaction conditions,the fatty acid methyl ester conversion of Pt/Al 2O 3-ZSM-5 was 99.4%,and the liquid yield of the target product was 86.8%.

关 键 词：Pt/Al2O3-ZSM-5 加氢脱氧 Brnsted酸 中孔体积 长链烷烃 

分 类 号：TQ426.81[化学工程]