Pd／Al2O3催化剂催化毛竹与聚乙烯共裂解反应研究

Pd/Al_2O_3 Catalysts Catalyzed Co-pyrolysis of Pubescens and Polyethylene

我们采用等体积浸渍法制备了Al2O3负载贵金属Pd系列催化剂,分别在N2和H2气氛下,研究了不同Pd负载量的催化剂对毛竹和低密度聚乙烯(LDPE)混合物的催化裂解性能.实验结果表明:Pd的负载量为1.0%时,Pd/Al2O3催化剂在两种气氛下活性均较好,在H2气氛下所得到的油品中烯烃含量较低,异链烷烃和环烷烃含量较高,油品的收率和质量均明显优于在N2气氛下所得到的油品.XRD表征发现,Pd负载量为1.0%的催化剂上,Pd在Al2O3载体上生成了晶形,表明金属钯有利于毛竹和LDPE共裂解生成液体产物.

Palladium catalysts supported on alumina with different Pd loading content were prepared by incipient wetness impregnation and tested in the co-pyrolysis of Pubescens and LDPE mixture in the nitrogen/hydrogen atmosphere using a fixed bed reactor. It was found that Pd/Al2O3 catalysts with 1.0% wt. % Pd loading showed the highest catalytic performance in both atmosphere, and the yields and quality of the oil products obtained under hydyogen atmosphere were obviously better than that under nitrogen atmosphere. The results showed that the yield of olefins was reduced, but that of iso-paraffins and cycloparaffin hydrocarbon were increased in H2 atmosphere comparing to N2 atmosphere. The XRD patterns showed that crystal palladium was formed on Pd/Al2O3 catalyst with 1.0% Pd loading. It revealed that crystal palladium favored the formation of liquid products in the co-pyrolysis of Pubescens and LDPE under hydrogen atmosphere.