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Chemistry and Industry of Forest Products ›› 2018, Vol. 38 ›› Issue (2): 112-118.doi: 10.3969/j.issn.0253-2417.2018.02.015

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Preparation of Aromatic Compounds by Catalytic Pyrolysis of Lignin over Mesoporous Molecular Sieves

LI Weixue, LIU Shiwei, YU Shitao, SONG Zhanqian   

  1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
  • Received:2017-09-27 Online:2018-04-25 Published:2018-04-28

Abstract: The mesoporous molecular sieve PNS-7 was synthesized by using ionic liquid[P123mim] Cl as template, and characterized by XRD, TEM, SEM and N2 adsorption/desorption techniques. Compared with the traditional mesoporous molecular sieve MAS-7, the synthesized molecular sieves PNS-7 had the typical hexagonal mesoporous structure, and the advantages of long-range orderliness, good crystallinity, narrow pore size distribution and high specific surface area. The effects of catalyst type and dosage, reaction temperature, and reaction time on the reaction of lignin were investigated by single factor and orthogonal experiments using PNS-7 and MAS-7 molecular sieves as catalysts. It was found that the molecular sieves PNS-7 had an outstanding catalytic performance for the lignin pyrolysis, and the lignin cracking residue rate was 27.6%, the selectivities of vanilla acid and vanillin were 28.2% and 29.6% under the reaction conditions of ethylene glycol as solvent, lignin 1.0 g, PNS-7 0.1 g, reacted temperature 180℃ and reaction time 3 h. In addition, the molecular sieves PNS-7 had good reusability for the lignin pyrolysis. After 4 repetitions, catalytic performance of PNS-7 was not obviously changed.

Key words: lignin, pyrolysis, PNS-7, MAS-7

CLC Number: