Chin. J. Org. Chem. ›› 2018, Vol. 38 ›› Issue (8): 2101-2108.DOI: 10.6023/cjoc201803039 Previous Articles     Next Articles



贾启芳a, 朱丽娟a, 范明慧b, 李全新a   

  1. a 中国科学技术大学化学物理系 安徽省生物质洁净能源重点实验室 合肥 230026;
    b 烟草化学安徽省重点实验室 安徽中烟工业有限责任公司 合肥 230088
  • 收稿日期:2018-03-25 修回日期:2018-05-08 发布日期:2018-05-24
  • 通讯作者: 李全新
  • 基金资助:


Catalytic Pyrolysis of Lignin for Directional Production of p-Xylene over Metal Oxides-Modified HZSM-5 Catalysts

Jia Qifanga, Zhu Lijuana, Fan Minghuib, Li Quanxina   

  1. a Department of Chemical Physics, Anhui Key Laboratory of Biomass Clean Energy, University of Science and Technology of China, Hefei 230026;
    b Anhui Key Laboratory of Tobacco Chemistry, Anhui Tobacco Industrial. Co., Ltd., Hefei 230088
  • Received:2018-03-25 Revised:2018-05-08 Published:2018-05-24
  • Contact: 10.6023/cjoc201803039
  • Supported by:

    Project supported by the National Key Basic Program of China (973 Program, No. 2013CB228105), the Program for Changjiang Scholars and Innovative Research Team in University and the Fundamental Research Funds for the Central Universities (No. 2060190040).

Para-xylene (p-xylene) is an important bulk chemical in petrochemical industry, and the production of biomass-based p-xylene is of great significance in both academic and industrial arenas. This work proves the one step process for the production of p-xylene through the catalytic pyrolysis of lignin into the aromatic monomers, together with the alkylation of light aromatics and the isomerization of xylenes isomers into p-xylene over metal oxides-modified HZSM-5 catalysts. The modified catalysts by adding the La, Mg, Ce, and Zn elements into HZSM-5 promoted the alkylation of light aromatics (like benzene and toluene) into xylenes, and the isomerization of m-/o-xylenes to p-xylene, due to the modulations of the acid strength and the strong acid sites. Co-catalytic pyrolysis of lignin and methanol significantly enhanced the production of p-xylene during the catalytic pyrolysis of lignin. The highest p-xylene yield of 13.9% with a p-xylene/xylenes ratio of 82.7% was obtained by the co-catalytic pyrolysis of lignin with 33 wt% methanol over the 20% La2O3/HZSM-5 catalyst. The reaction pathway for the formation of p-xylene from lignin was addressed based on the identified products and the characterization of catalysts.

Key words: lignin, p-xylene, catalytic pyrolysis, alkylation, isomerization